Conversion of units
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225997032
2008-07-16T11:12:04Z
150.203.35.113
/* Length */ make the link reflect the destination
{{Disputed}}
'''Conversion of units''' refers to '''conversion factors''' between different [[units of measurement]] for the same [[quantity]].
{{TOCright}}
==Techniques==
=== Rounding of results ===
The process of making a conversion cannot produce a more precise result than the original quoted figure. Appropriate rounding of results is normally performed after conversion. (See [[significant figures]]).
== Tables of conversion factors ==
<!--
Someone please fill in about [[candela]], [[lumen]] and [[lux]].
-->
This article gives lists of conversion factors for each of a number of physical quantities, which are listed in the index. For each physical quantity, a number of different units (some only of historical interest) are shown and expressed in terms of the corresponding [[SI]] unit.
===Legend===
{| class="wikitable"
|+ Legend
! ≡
| definition
|-
! =
| exactly equal to
|-
! ≈
| approximately equal to
|-
! <var><span style="text-decoration: overline">digits</span></var>
| indicates that <var>digits</var> repeat infinitely (i.e. <var>8.294 <span style="text-decoration: overline">369</span></var> corresponds to <var>8.294 369 369 369 369 ...</var>)
|-
! (H)
| of chiefly historical interest
|}
===Luminance===
{| class="wikitable"
|+ [[Luminance]]
|-----
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[candela per square metre]] ([[SI base unit]]) ||
| ≡ cd/m<sup>2</sup>
| = 1 cd/m<sup>2</sup>
|-----
| [[lambert (unit)|lambert]] || L
| ≡ (10<sup>4</sup>/π) cd/m<sup>2</sup>
| ≈ 3183.09886 cd/m<sup>2</sup>
|}
===Length===
{{disputedsection}}
{| class="wikitable"
|+ [[Length]]
|-----
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[metre]] ([[SI base unit]]) || m
| ≡ 1 m
| = 1 m
|-----
| [[ångström]] || Å
| = 0.1 nm
| ≡ 1{{e|−10}} m
|-----
| [[astronomical unit]] || AU
| Mean distance from Earth to the Sun
| = 149 597 870 691 ± 30 m
|-----
| [[atomic units|atomic unit of length]] || a<sub>0</sub>
| ≡ Bohr radius of hydrogen
| ≈ 5.29 177 208 59{{e|−11}} ± 3.6{{e|−20}} m<ref>"[http://physics.nist.gov/cgi-bin/cuu/Value?bohrrada0|search_for=Bohr+radius NIST Reference on Constants, Units, and Uncertainty."](2006). [[National Institute of Standards and Technology]]. Accessed 22 February 2008.</ref>
|-----
| barley corn (H) ||
| ≡ ⅓ in (see note above about rounding)
| ≈ 0.008 m
|-----
| [[Bohr radius]] || a<sub>0</sub>; b
| ≡ [[fine structure constant|α]]/4π[[Rydberg constant|''R''<sub>∞</sub>]]
| ≈ 5.291 772 083{{e|−11}} ± 19{{e|−20}} m
|-----
| cable length (Imperial) ||
| ≡ 608 ft
| = 185.3184 m
|-----
| [[cable length]] (International) ||
| ≡ 1/10 nmi
| = 185.2 m
|-----
| cable length (U.S.) ||
| ≡ 720 ft
| = 219.456 m
|-----
| [[chain (unit)|chain]] ([[Edmund Gunter|Gunter's]]; Surveyor's) || ch
| ≡ 66.0 ft (4 rods)
| = 20.1168 m
|-----
| [[chain (unit)|chain]] ([[Jesse Ramsden|Ramsden]]'s<!--- Ramsden: http://www.scienceandsociety.co.uk/results.asp?image=10280167&wwwflag=2&imagepos=6 Ramden: [http://aurora.rg.iupui.edu/~schadow/units/UCUM/ucum.html The Unified Code for Units of Measures] --->; Engineer's) || ch
| ≡ 100 ft
| = 30.48 m
|-----
| cubit (H) ||
| ≈ 18 in
| ≈ 0.5 m
|-----
| ell (H) || ell
| ≡ 45 in
| = 1.143 m
|-----
|fathom || fm
| ≡ 6 ft
| = 1.8288 m
|-----
|fathom || fm
| ≈ 1/1000 nmi{{Fact|date=April 2008}}
| = 1.852 m
|-----
| fermi || fm
| ≡ 1{{e|−15}} m
| = 1{{e|−15}} m
|-----
| finger ||
| ≡ 7/8 in
| = 0.022 225 m
|-----
| finger (cloth) ||
| ≡ 4 ½ in
| = 0.1143 m
|-----
| [[foot (unit of length)|foot]] (Benoît)(H) || ft (Ben)
|
| ≈ 0.304 799 735 m
|-----
| [[foot (unit of length)|foot]] (Clarke's; Cape)(H) || ft (Cla)
|
| ≈ 0.304 797 265 4 m
|-----
| [[foot (unit of length)|foot]] (Indian)(H) || ft Ind
|
| ≈ 0.304 799 514 m
|-----
| [[foot (unit of length)|foot]] (International) || ft
| ≡ 12 inches = 1/3 yd
| = 0.3048 m
|-----
| [[foot (unit of length)|foot]] (Sear's)(H) || ft (Sear)
|
| ≈ 0.304 799 47 m
|-----
| [[foot (unit of length)|foot]] (U.S. Survey)(H) || ft (US)
| ≡ 1200/3937 m <ref name=nbs>National Bureau of Standards. (June 30, 1959). ''Refinement of values for the yard and the pound''. Federal Register, viewed September 20, 2006 at [http://www.ngs.noaa.gov/PUBS_LIB/FedRegister/FRdoc59-5442.pdf National Geodetic Survey web site].</ref>
| ≈ 0.304 800 610 m
|-----
| [[French catheter scale|french]]; charriere || F
| ≡ 1/3 mm
| = 3.<span style="text-decoration: overline">3</span> {{e|−4}} m
|-----
| [[furlong]] || fur
| ≡ 10 chains = 660 ft =220 yd
| = 201.168 m
|-----
| [[geographical mile]] (H) || <!--Please provide a reference for any symbols-->
| ≡ 6082 ft
| = 1853.7936 m
|-----
| hand ||
| ≡ 4 in
| = 0.1016 m
|-----
| [[inch]] || in
| ≡ 1/36 yd = 1/12 ft
| = 0.0254 m
|-----
| [[league (unit)|league]] || lea
| ≡ 3 mi
| = 4828.032 m
|-----
| [[light-day]] ||
| ≡ 24 light-hours
| = 2.590 206 837 12{{e|13}} m
|-----
| [[light-hour]] ||
| ≡ 60 light-minutes
| = 1.079 252 848 8{{e|12}} m
|-----
| [[light-minute]] ||
| ≡ 60 light-seconds
| = 1.798 754 748{{e|10}} m
|-----
| [[light second|light-second]] ||
|
| ≡ 2.997 924 58{{e|8}} m
|-----
| [[light year|light-year]] || l.y.
| ≡ ''c''<sub>0</sub> × 86 400 × 365.25
| = 9.460 730 472 580 8{{e|15}} m
|-----
| line || ln
| ≡ 1/12 in (Klein 1988, 63)
| = 0.002 11<span style="text-decoration: overline">6</span> m
|-----
| link (Gunter's; Surveyor's) || lnk
| ≡ 1/100 ch
| = 0.201 168 m
|-----
| link (Ramsden's; Engineer's) || lnk
| ≡ 1 ft
| = 0.3048 m
|-----
| mickey ||
| ≡ 1/200 in
| = 1.27{{e|−4}} m
|-----
| [[micrometre|micron]]|| µ
|
| ≡ 1{{e|−6}} m
|-----
| mil; [[thou (unit of length)|thou]] || mil
| ≡ 1{{e|−3}} in
| = 2.54{{e|−5}} m
|-----
| [[Norwegian/Swedish mil|mil]] (Sweden and Norway) || mil
| ≡ 10 km
| = 10000 m
|-----
| [[mile]] || mi
| ≡ 1760 yd = 5280 ft
| = 1609.344 m
|-----
| [[mile]] (U.S. Survey) || mi
| ≡ 5280 ft (US)
| = 5280 × 1200/3937 m ≈ 1609.347 219 m
|-----
| nail (cloth) ||
| ≡ 2 ¼ in
| = 0.000 571 5 m
|-----
| nautical league || NL; nl
| ≡ 3 nmi
| = 5556 m
|-----
| [[nautical mile]](international) || NM; nmi
| ≡ 1852 m <ref name=Table8> [http://www.bipm.org/en/si/si_brochure/chapter4/table8.html ''International System of Units,''] 8th ed. (2006), [[Bureau International des Poids et Mesures]], Section 4.1 Table 8.</ref>
| = 1852 m
|-----
| [[nautical mile]] (Admiralty) || NM (Adm); nmi (Adm)
| ≡ 6080 ft
| ≡ 1853.184 m
|-----
| pace ||
| ≡ 2.5 ft
| = 0.762 m
|-----
| palm ||
| ≡ 3 in
| = 0.000 762 m
|-----
| [[parsec]] || pc
|
| = 3.08567782 {{e|16}} ± 6{{e|6}} m <ref name=Seidelmann>P. Kenneth Seidelmann, Ed. (1992). ''Explanatory Supplement to the Astronomical Almanac.'' Sausalito, CA: University Science Books. p. 716 and s.v. parsec in Glossary.</ref>
|-----
| point ([[American Typefounders Association|ATA]]) || pt
| ≡ 0.013837 in{{Fact|date=June 2008}}
| = 0.000 351 459 8 m
|-----
| point (Didot; European) || pt
|
| ≡ 0.000 376 065 m{{Fact|date=June 2008}}
|-----
| point (metric) || pt
| ≡ 3/8 mm
| = 0.000 375 m{{Fact|date=June 2008}}
|-----
| point ([[PostScript]])|| pt
| ≡ 1/72 in
| = 0.000 352 <span style="text-decoration: overline">7</span> m
|-----
| quarter ||
| ≡ ¼ yd
| = 0.2286 m
|-----
| [[rod (unit)|rod]]; pole; perch (H) || rd
| ≡ 16 ½ ft
| = 5.0292 m
|-----
| rope (H) || rope
| ≡ 20 ft
| = 6.096 m
|-----
| span (H) ||
| ≡ 6 in
| = 0.1524 m
|-----
| span (cloth) (H)||
| ≡ 9 in
| = 0.2286 m
|-----
| spat<ref>http://www.unc.edu/~rowlett/units/dictS.html</ref> ||
| ≡ 10<sup>12</sup> m
| = 1×10<sup>12</sup> m
|-----
| stick (H) ||
| ≡ 2 in
| = 0.05 08 m
|-----
| [[stigma (unit)|stigma]]; pm||
| ≡ 1{{e|−12}} m
| ≡ 1{{e|−12}} m
|-----
| telegraph [[mile]] (H) || mi
| ≡ 6087 ft
| = 1855.3176 m
|-----
| [[twip]] || twp
| ≡ 1/1440 in
| = 1.763 <span style="text-decoration: overline">8</span>{{e|−5}} m
|-----
| [[x unit]]; [[siegbahn]] || xu
|
| ≈ 1.0021{{e|−13}} m
|-----
| [[yard]] (International) || yd
| ≡3 ft ≡ 36 in
| = 0.9144 m<ref name=nbs/>
|}
===Area===
{| class="wikitable"
|+ [[Surface area|Area]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[acre]] || ac
| ≡ 10 sq ch = 4840 sq yd
| = 4046.856 422 4 m²
|-----
| [[are]] || a
|
| ≡ 100 m²
|-----
| [[barn (unit)|barn]] || b
|
| ≡ 10<sup>−28</sup> m²
|-----
| barony ||
| ≡ 4000 ac
| = 1.618 742 568 96{{e|7}} m²
|-----
| board || bd
| ≡ 1 in × 1 ft
| = 7.741 92{{e|−3}} m²
|-----
| boiler horsepower equivalent direct radiation || bhp EDR
| ≡ (1 ft²) (1 bhp) / (240 BTU<sub>IT</sub>/h)
| ≈ 12.958 174 m²
|-----
| circular [[inch]] || circ in
| ≡ π/4 sq in
| ≈ 5.067 075{{e|−4}} m²
|-----
| circular mil; circular thou || circ mil
| ≡ π/4 mil²
| ≈ 5.067 075{{e|−10}} m²
|-----
| cord ||
| ≡ 192 bd
| = 1.486 448 64 m²
|-----
| [[dunam]] ||
| ≡ 1000 m²
| = 1000 m²
|-----
| [[hectare]] || ha
| ≡ 10 000 m²
| = 10 000 m²
|-----
| [[hide (unit)|hide]] ||
| ≡ 100 ac<!-- Definition is "amount of land required to support one peasant family" -->
| = 4.046 856 422 4{{e|5}} m²
|-----
| rood || ro
| ≡ ¼ ac
| = 1011.714 105 6 m²
|-----
| [[shed (physics)|shed]] ||
|
| ≡ 10<sup>−52</sup> m²
|-----
| square chain || sq ch
| ≡ 1 sq ch
| = 404.685 642 24 m²
|-----
| [[square foot]] || sq ft
| ≡ 1 ft × 1 ft
| = 9.290 304{{e|−2}} m²
|-----
| [[square inch]] || sq in
| ≡ 1 in × 1 in
| = 6.4516{{e|−4}} m²
|-----
| [[square kilometre]] || km²
| ≡ 1 km²
| = 10<sup>6</sup> m²
|-----
| square link || sq lnk
| ≡ 1 lnk²
| = 4.046 856 422 4{{e|−2}} m²
|-----
| [[square metre]] (SI unit) || m²
| ≡ 1 [[Metre|m]] × 1 m
| = 1 m²
|-----
| square mil; square thou || sq mil
| ≡ 1 mil × 1 mil
| = 6.4516{{e|−10}} m²
|-----
| square [[mile]]; section || sq mi
| ≡ 1 mi × 1 mi
| = 2.589 988 110 336{{e|6}} m²
|-----
| square rod/pole/perch || sq rd
| ≡ 1 sq rd
| = 25.292 852 64 m²
|-----
| square U.S. Survey [[foot]] || sq ft
| ≡ 1 sq ft (US)
| ≈ 9.290 341 161 327 49{{e|-2}} m²
|-----
| square U.S. Survey [[mile]] || sq mi
| ≡ 1 sq mi (US)
| ≈ 2.589 998{{e|6}} m²
|-----
| [[square yard]] || sq yd
| ≡ 1 yd × 1 yd
| = 0.836 127 36 m²
|-----
| [[stremma]] ||
| ≡ 1000 m²
| = 1000 m²
|-----
| [[survey township|township]] ||
| ≡ 36 sq mi (US)
| ≈ 9.323 994{{e|7}} m²
|-----
| yardland ||
| ≡ 30 ac
| = 1.214 056 926 72{{e|5}} m²
|}
===Volume===
{{disputedsection}}
{| class="wikitable"
|+ [[Volume]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[acre foot]] || ac ft
| ≡ 1 ac x 1 ft = 43560 ft³
| = 1 233.481 837 547 52 m³
|-----
| [[cubic metre]] (SI unit) || m³
| ≡ 1 m × 1 m × 1 m
| = 1 m³
|-----
| [[litre]] || L
| ≡ 1 dm³ <ref name=specpub330>Barry N. Taylor, Ed.,[http://physics.nist.gov/Pubs/SP330/sp330.pdf ''NIST Special Publication 330: The International System of Units (SI)''] (2001 Edition), Washington: U.S. Government Printing Office, 43,"The 12th Conference Generale des Poids et Mesures (CGPM)…declares that the word “liter” may be employed as a special name for the cubic decimeter".</ref>
| = 0.001 m³
|-----
| [[lambda (unit)|lambda]] || λ
| ≡ 1 mm³
| = 1 {{e|−9}} m³
|-----
| [[drop (unit)|drop]] (metric) ||
| ≡ 1/20 mL
| = 5 {{e|−9}} m³
|-----
| [[minim (unit)|minim]] (Imperial) || min
| ≡ 1/480 fl oz (Imp) = 1/60 fl dr (Imp)
| = 5.919 388 020 8<span style="text-decoration: overline">3</span> {{e|−9}} m³
|-----
| minim (U.S.) || min
| ≡ 1/480 US fl oz = 1/60 US fl dr
| = 6.161 151 992 187 5 {{e|−9}} m³
|-----
| drop (U.S.) (alt) || gtt
| ≡ 1/456 US fl oz
| ≈ 6.485 423 1 {{e|−9}} m³
|-----
| drop (Imperial) (alt) || gtt
| ≡ 1/1824 gi (Imp)
| ≈ 7.788 668 4 {{e|−9}} m³
|-----
| drop (U.S.) || gtt
| ≡ 1/360 US fl oz
| = 8.214 869 322 91<span style="text-decoration: overline">6</span> {{e|−9}} m³
|-----
| drop (medical) ||
| ≡ 1/12 ml
| = 8.3<span style="text-decoration: overline">3</span> {{e|−8}} m³
|-----
| drop (Imperial) || gtt
| ≡ 1/288 fl oz (Imp)
| = 9.865 646 701 3<span style="text-decoration: overline">8</span> {{e|−9}} m³
|-----
| dash (U.S.) ||
| ≡ 1/96 US fl oz = ½ US pinch
| = 0.030 805 759 960 937 5 {{e|−6}} m³
|-----
| dash (Imperial) ||
| ≡ 1/384 gi (Imp) = ½ pinch (Imp)
| = 0.036 996 175 130 208 <span style="text-decoration: overline">3</span> {{e|−6}} m³
|-----
| pinch (U.S.) ||
| ≡ 1/48 US fl oz = ⅛ US tsp
| = 0.061 611 519 921 875 {{e|−6}} m³
|-----
| pinch (Imperial) ||
| ≡ 1/192 gi (Imp) = ⅛ tsp (Imp)
| = 0.073 992 350 260 41<span style="text-decoration: overline">6</span> {{e|−6}} m³
|-----
| [[fluid scruple]] (Imperial) || fl s
| ≡ 1/24 fl oz (Imp)
| = 0.118 387 760 41<span style="text-decoration: overline">6</span> {{e|−6}} m³
|-----
| [[Dram (unit)|fluid drachm]] (Imperial) || fl dr
| ≡ ⅛ fl oz (Imp)
| = 0.355 163 281 25 {{e|−6}} m³
|-----
| [[Dram (unit)|fluid dram]] (U.S.); U.S. fluidram || fl dr
| ≡ ⅛ US fl oz
| = 0.369 669 119 531 25 {{e|−6}} m³
|-----
| [[teaspoon]] (Canadian) || tsp
| ≡ 1/6 fl oz (Imp)
| = 0.473 551 041 <span style="text-decoration: overline">6</span> {{e|−6}} m³
|-----
| teaspoon (U.S.) || tsp
| ≡ 1/6 US fl oz
| = 0.492 892 159 5 {{e|−6}} m³
|-----
| teaspoon (metric) ||
|
| ≡ 0.5 {{e|−6}} m³
|-----
| teaspoon (Imperial) || tsp
| ≡ 1/24 gi (Imp)
| = 0.591 938 802 08<span style="text-decoration: overline">3</span> {{e|−6}} m³
|-----
| [[dessertspoon]] (Imperial) ||
| ≡ 1/12 gi (Imp)
| = 1.183 877 604 1<span style="text-decoration: overline">6</span> {{e|−6}} m³
|-----
| [[tablespoon]] (Canadian) || tbsp
| ≡ ½ fl oz (Imp)
| = 1.420 653 125 {{e|−6}} m³
|-----
| tablespoon (U.S.) || tbsp
| ≡ ½ US fl oz
| = 1.478 676 478 25 {{e|−6}} m³
|-----
| tablespoon (metric) ||
|
| ≡ 1.5 {{e|−6}} m³
|-----
| cubic [[inch]] || cu in
| ≡ 1 in × 1 in × 1 in
| = 1.638 706 4 {{e|−5}} m³
|-----
| tablespoon (Imperial) || tbsp
| ≡ 5/8 fl oz (Imp)
| = 1.775 816 406 25 {{e|−6}} m³
|-----
| pony ||
| ≡ 3/4 US fl oz
| = 2.218 014 717 187 5 {{e|−6}} m³
|-----
| [[fluid ounce]] (Imperial) || fl oz (Imp)
| ≡ 1/160 gal (Imp)
| = 2.841 306 25 {{e|−6}} m³
|-----
| fluid ounce (U.S.) || US fl oz
| ≡ 1/128 gal (US)
| = 2.957 352 956 25 {{e|−6}} m³
|-----
| shot ||
| ≡ 1 US fl oz
| ≈ 2.957 {{e|−6}} m³
|-----
| jigger ||
| ≡ 1½ US fl oz
| ≈ 4.436 {{e|−6}} m³
|-----
| [[gill]] (U.S.) || gi (US)
| ≡ 4 US fl oz
| = 11.829 411 825 {{e|−6}} m³
|-----
| gill (Imperial); Noggin || gi (Imp); nog
| ≡ 5 fl oz (Imp)
| = 14.206 531 25 {{e|−6}} m³
|-----
| [[Cup (unit)|cup]] (Canadian) || c (CA)
| ≡ 8 fl oz (Imp)
| = 22.730 45 {{e|−6}} m³
|-----
| cup (U.S.) || c (US)
| ≡ 8 US fl oz ≡ 1/16 gal (US)
| = 23.658 823 65 {{e|−6}} m³
|-----
| cup (metric) || c
|
| ≡ 25.0 {{e|−6}} m³
|-----
| breakfast cup ||
| ≡ 10 fl oz (Imp)
| = 28.413 062 5 {{e|−6}} m³
|-----
| [[pint]] (U.S. fluid) || pt (US fl)
| ≡ ⅛ gal (US)
| = 47.317 647 3 {{e|−6}} m³
|-----
| pint (U.S. dry) || pt (US dry)
| ≡ 1/64 bu (US lvl) ≡ ⅛ gal (US dry)
| = 0.550 610 471 357 5 {{e|−3}} m³
|-----
| pint (Imperial) || pt (Imp)
| ≡ ⅛ gal (Imp)
| = 0.568 261 25 {{e|−3}} m³
|-----
| fifth ||
| ≡ 1/5 US gal
| = 0.757 082 356 8 {{e|−3}} m³
|-----
| [[quart]] (U.S. fluid) || qt (US)
| ≡ ¼ gal (US fl)
| = 0.946 352 946 {{e|−3}} m³
|-----
| quart (U.S. dry) || qt (US)
| ≡ 1/32 bu (US lvl) = ¼ gal (US dry)
| = 1.101 220 942 715 {{e|−3}} m³
|-----
| quart (Imperial) || qt (Imp)
| ≡ ¼ gal (Imp)
| = 1.136 522 5 {{e|−3}} m³
|-----
| pottle; quartern ||
| ≡ ½ gal (Imp) = 80 fl oz (Imp)
| = 2.273 045 {{e|−3}} m³
|-----
| [[board-foot]] || fbm
| ≡ 144 cu in
| = 2.359 737 216 {{e|−3}} m³
|-----
| [[gallon]] (U.S. fluid; Wine) || gal (US)
| ≡ 231 cu in
| = 3.785 411 784 {{e|−3}} m³
|-----
| gallon (U.S. dry) || gal (US)
| ≡ ⅛ bu (US lvl)
| = 4.404 883 770 86 {{e|−3}} m³
|-----
| gallon (Imperial) || gal (Imp)
| ≡
| = 4.546 09 {{e|−3}} m³
|-----
| beer gallon || beer gal
| ≡ 282 cu in
| = 4.621 152 048 {{e|−3}} m³
|-----
| [[peck]] (U.S. dry) || pk
| ≡ ¼ US lvl bu
| = 8.809 767 541 72 {{e|−3}} m³
|-----
| [[peck]] (Imperial) || pk
| ≡ 2 gal (Imp)
| = 9.092 18 {{e|−3}} m³
|-----
| [[bucket (unit)|bucket]] (Imperial) || bkt
| ≡ 4 gal (Imp)
| = 0.018 184 36 m³
|-----
| [[timber foot]] ||
| ≡ 1 cu ft
| = 0.028 316 846 592 m³
|-----
| [[cubic foot]] || cu ft
| ≡ 1 ft × 1 ft × 1 ft
| = 0.028 316 846 592 m³
|-----
| [[firkin]] ||
| ≡ 9 gal (US)
| = 0.034 068 706 056 m³
|-----
| [[bushel]] (U.S. dry level) || bu (US lvl)
| ≡ 2150.42 cu in
| = 0.035 239 070 166 88 m³
|-----
| bushel (Imperial) || bu (Imp)
| ≡ 8 gal (Imp)
| = 0.036 368 72 m³
|-----
| bushel (U.S. dry heaped) || bu (US)
| ≡ 1 ¼ bu (US lvl)
| = 0.044 048 837 708 6 m³
|-----
| strike (U.S.) ||
| ≡ 2 bu (US lvl)
| = 0.070 478 140 333 76 m³
|-----
| strike (Imperial) ||
| ≡ 2 bu (Imp)
| = 0.072 737 44 m³
|-----
| [[kilderkin]] ||
| ≡ 18 gal (Imp)
| = 0.081 829 62 m³
|-----
| [[sack]] (U.S.) ||
| ≡ 3 bu (US lvl)
| = 0.105 717 210 500 64 m³
|-----
| sack (Imperial); bag ||
| ≡ 3 bu (Imp)
| = 0.109 106 16 m³
|-----
| [[barrel (unit)|barrel]] (U.S. dry) || bl (US)
| ≡ 105 qt (US) = 105/32 bu (US lvl)
| = 0.115 628 198 985 075 m³
|-----
| barrel (U.S. fluid) || fl bl (US)
| ≡ 31½ gal (US)
| = 0.119 240 471 196 m³
|-----
| [[coomb]] ||
| ≡ 4 bu (Imp)
| = 0.145 474 88 m³
|-----
| barrel (petroleum) || bl; bbl
| ≡ 42 gal (US)
| = 0.158 987 294 928 m³
|-----
| barrel (Imperial) || bl (Imp)
| ≡ 36 gal (Imp)
| = 0.163 659 24 m³
|-----
| [[hogshead]] (U.S.) || hhd (US)
| ≡ 2 fl bl (US)
| = 0.238 480 942 392 m³
|-----
| [[seam]] ||
| ≡ 8 bu (US lvl)
| = 0.281 912 561 335 04 m³
|-----
| quarter; [[pail]] ||
| ≡ 8 bu (Imp)
| = 0.290 949 76 m³
|-----
| hogshead (Imperial) || hhd (Imp)
| ≡ 2 bl (Imp)
| = 0.327 318 48 m³
|-----
| [[cord-foot]] ||
| ≡ 16 cu ft
| = 0.453 069 545 472 m³
|-----
| [[Butt (unit)|butt]], pipe ||
| ≡ 126 gal (wine)
| = 0.476 961 884 784 m³
|-----
| [[perch]] || per
| ≡ 16½ ft × 1½ ft × 1 ft
| = 0.700 841 953 152 m³
|-----
| cubic [[yard]] || cu yd
| ≡ 27 cu ft
| = 0.764 554 857 984 m³
|-----
| [[ton|tun]] ||
| ≡ 252 gal (wine)
| = 0.953 923 769 568 m³
|-----
| displacement [[ton]] ||
| ≡ 35 cu ft
| = 0.991 089 630 72 m³
|-----
| water ton ||
| ≡ 28 bu (Imp)
| = 1.018 324 16 m³
|-----
| freight ton ||
| ≡ 40 cu ft
| = 1.132 673 863 68 m³
|-----
| [[Wey (unit)|wey]] (U.S.) ||
| ≡ 40 bu (US lvl)
| = 1.409 562 806 675 2 m³
|-----
| load ||
| ≡ 50 cu ft
| = 1.415 842 329 6 m³
|-----
| register ton ||
| ≡ 100 cu ft
| = 2.831 684 659 2 m³
|-----
| [[last]] ||
| ≡ 80 bu (Imp)
| = 2.909 497 6 m³
|-----
| cord ([[Wood fuel#Firewood|firewood]]) ||
| ≡ 8 ft × 4 ft × 4 ft
| = 3.624 556 363 776 m³
|-----
| cubic [[fathom]] || cu fm
| ≡ 1 fm × 1 fm × 1 fm
| = 6.116 438 863 872 m³
|-----
| acre-inch ||
| ≡ 1 ac × 1 in
| = 102.790 153 128 96 m³
|-----
| cubic [[mile]] || cu mi
| ≡ 1 mi × 1 mi × 1 mi
| = 4 168 181 825.440 579 584 m³
|}
===Angle===
{{disputedsection}}
{| class="wikitable"
|+ [[Angle]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[radian]] (SI unit) || rad
| ≡ 180°/π
| 1 rad
|-----
| [[centesimal]] [[second of arc]] || "
| ≡ 1 grad/10000
| ≈ 1.57 079 6{{e|−6}} rad
|-----
| [[arcsecond]] || "
| ≡ 1°/3600
| ≈ 4.84 813 7{{e|−6}} rad
|-----
| [[centesimal]] [[minute of arc]] || '
| ≡ 1 grad/100
| ≈ 15.708 0{{e|−6}} rad
|-----
| [[minute of arc]] || '
| ≡ 1°/60
| ≈ 29.088 8{{e|−6}} rad
|-----
| [[angular mil]] || µ
| ≡ 2π/6400 rad
| ≈ 9.8174 8{{e|−4}} rad
|-----
| [[grad (angle)|grad]]; [[gradian]]; [[gon]] || grad
| ≡ 2π/400 rad = 0.9°
| ≈ 1.570 796 3{{e|−3}} rad
|-----
| [[degree (angle)|degree (of arc)]] || °
| ≡ π/180 rad
| ≈ 1.745 329 3{{e|−3}} rad
|-----
| sign ||
| ≡ 30°
| ≈ 0.523 599 rad
|-----
| [[octant]] ||
| ≡ 45°
| ≈ 0.785 398 rad
|-----
| sextant ||
| ≡ 60°
| ≈ 1.047 198 rad
|-----
| [[quadrant]] ||
| ≡ 90°
| ≈ 1.570 796 rad
|}
===Solid angle===
{| class="wikitable"
|+ [[Solid angle]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[steradian]] || sr
|
| ([[SI derived unit]])
|}
===Mass===
{{disputedsection}}
''Note: see [[Weight]] for detail of mass/weight distinction and conversion''
{| class="wikitable"
|+ [[Mass]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[kilogram]] ([[SI base unit]])
|| kg
| ≡ 1kg – see also [[grave (mass)]] (G)
| = 1kg
|-----
| [[gram]] || g
| 1/1000 of the SI base unit kg
| = 1{{e|−3}} kg
|-----
| [[electron]] rest mass || m<sub>e</sub>
|
| ≈ 9.109 381 88{{e|−31}} ± 72{{e|−39}} kg
|-----
| [[atomic units|atomic unit of mass]] || au
| ≡ m<sub>e</sub>
| ≈ 9.109 381 88{{e|−31}} ± 72{{e|−39}} kg
|-----
| [[unified atomic mass unit]] || u
|
| ≈ 1.660 538 73{{e|−27}} ± 13{{e|−35}} kg
|-----
| [[dalton (unit)|dalton]] || Da
|
| ≈ 1.660 902 10{{e|−27}} ± 13{{e|−35}} kg
|-----
| [[gamma (unit)|gamma]] || γ
|
| ≡ 1 {{e|-6}} kg
|-----
| [[MeV]]/[[speed of light|c]]<sup>2</sup> || MeV/c<sup>2</sup>
| Also keV/c<sup>2</sup>, etc. See [[Electronvolt#As_a_measurement_of_mass]].
| ≈ 1.7827{{e|−30}} kg
|-----
| [[point (unit of mass)|point]] ||
| ≡ 1/100 kt (metric)<!--carat, not kiloton-->
| = 2 {{e|-6}} kg
|-----
| [[mite (unit)|mite]] ||
| ≡ 1/20 gr
| = 3.239 945 5 {{e|-6}} kg
|-----
| [[mite (unit)|mite]] (metric) ||
| ≡ 1/20 g
| = 50 {{e|-6}} kg
|-----
| [[grain (measure)|grain]] || gr
|
| ≡ 64.798 91 {{e|-6}} kg
|-----
| [[crith]] ||
|
| ≈ 89.9349 {{e|-6}} kg
|-----
| [[carat (mass)|carat]] (metric) || ct
|
| ≡ 200 {{e|-6}} kg
|-----
| [[carat (mass)|carat]] || kt
| ≡ 3 1/6 gr
| ≈ 205.196 548 333 {{e|-6}} kg
|-----
| [[sheet (unit)|sheet]] ||
| ≡ 1/700 lb av
| = 647.9891 {{e|-6}} kg
|-----
| [[scruple]] ([[apothecary]]) || s ap
| ≡ 20 gr
| = 1.295 978 2 {{e|-3}} kg
|-----
| [[pennyweight]] || dwt; pwt
| ≡ 1/20 oz t
| = 1.555 173 84 {{e|-3}} kg
|-----
| [[Avoirdupois|dram]] (avoirdupois) || dr av
| ≡ 27 11/32 gr
| = 1.771 845 195 312 5 {{e|-3}} kg
|-----
| [[Dram (unit)|dram]] (apothecary; [[Troy weight|troy]]) || dr t
| ≡ 60 gr
| = 3.887 934 6 {{e|-3}} kg
|-----
| [[hyl]] (CGS unit) ||
| ≡ 1 gee × 1 g × 1 s²/m
| = 9.806 65 {{e|-3}} kg
|-----
| [[ounce]] (avoirdupois) || oz av
| ≡ 1/16 lb
| = 28.349 523 125 {{e|-3}} kg
|-----
| [[assay ton]] (short) || AT
| ≡ 1 mg × 1 sh tn ÷ 1 oz t
| ≈ 29.166 667 {{e|-3}} kg
|-----
| [[troy ounce|ounce (apothecary; troy)]] || oz t
| ≡ 1/12 lb t
| = 31.103 476 8 {{e|-3}} kg
|-----
| [[assay ton]] (long) || AT
| ≡ 1 mg × 1 long tn ÷ 1 oz t
| ≈ 32.666 667 {{e|-3}} kg
|-----
| [[mark (unit of mass)|mark]] ||
| ≡ 8 oz t
| = 248.827 814 4 {{e|-3}} kg
|-----
| [[pound (mass)|pound (troy)]] || lb t
| ≡ 5760 grains
| = 0.373 241 721 6 kg
|-----
| [[pound (mass)|pound (avoirdupois)]] || lb av
| ≡ 7000 grains
| = 0.453 592 37 kg
|-----
| [[pound (mass)|pound (metric)]] ||
|
| ≡ 0.5 kg
|-----
| [[clove (unit of mass)|clove]] ||
| ≡ 8 lb av
| = 3.628 738 96 kg
|-----
| [[stone (weight)|stone]] || st
| ≡ 14 lb av
| = 6.350 293 18 kg
|-----
| [[hyl]] (MKS unit) ||
| ≡ 1 gee × 1 kg × 1 s²/m
| = 9.806 65 kg
|-----
| quarter (Imperial) ||
| ≡ 1/4 long cwt = 2 st = 28 lb av
| = 12.700 586 36 kg
|-----
| slug; geepound || slug
| ≡ 1 gee × 1 lb av × 1 s²/ft
| ≈ 14.593 903 kg
|-----
| bag ([[Portland cement]])||
| ≡ 94 lb av
| = 42.637 682 78 kg
|-----
| short [[hundredweight]]; cental || sh cwt
| ≡ 100 lb av
| = 45.359 237 kg
|-----
| long [[hundredweight]]|| long cwt or cwt
| ≡ 112 lb av
| = 50.802 345 44 kg
|-----
| bag ([[coffee]])
|
| ≡ 60 kg
| = 60 kg
|-----
| [[quintal (unit of mass)|quintal]] (metric) || q
|
| ≡ 100 kg
|-----
| [[Wey (unit)|wey]] ||
| ≡ 252 lb = 18 st (variants exist)
| = 114.305 277 24 kg
|-----
| long quarter (informal)||
| ≡ ¼ long tn
| = 254.011 727 2 kg
|-----
| quarter (informal)||
| ≡ ¼ short tn
| = 226.796 185 kg
|-----
| [[kip (unit)|kip]] || kip
| ≡ 1000 lb av<!--KIloPound-->
| = 453.592 37 kg
|-----
| [[short ton]] || sh tn
| ≡ 2000 lb
| = 907.184 74 kg
|-----
| [[tonne]] ([[Metre-tonne-second system of units|mts]] unit) || t
|
| ≡ 1000 kg
|-----
| [[long ton]]|| long tn or ton
| ≡ 2240 lb
| = 1016.046 908 8 kg
|-----
| barge ||
| ≡ 22 ½ sh tn
| = 20,411.656 65 kg
|-----
| Zentner || Ztr.
| Definitions vary; see <ref>The Swiss Federal Office for Metrology gives ''Zentner'' on a German language web page[http://www.metas.ch/de/scales/systemch.html] and ''quintal'' on the English translation of that page[http://www.metas.ch/en/scales/systemch.html]; the unit is marked "spécifiquement suisse !"</ref> and <ref>Rowlett, Russ. ''A Dictionary of Units of Measurement''. Viewed [[October 14]], 2006 at http://www.unc.edu/~rowlett/units/dictZ.html</ref>. See also discussion at [[Talk:Conversion of units#Zentner]]
|
|}
In [[physics]], the [[pound (mass)|pound of mass]] is sometimes written '''lbm''' to distinguish it from the [[pound-force]] ('''lbf'''). It should not be read as the mongrel unit "pound metre".
===Time===
{{disputedsection}}
{| class="wikitable"
|+ [[Time]], t
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[second]] ([[SI base unit]]) || s
|
| = 1 s
|-----
| [[Planck time]] ||
| ≡ ([[gravitational constant|G]][[Dirac's constant|{{Unicode|ℏ}}]]/''[[speed of light|c]]''<sup>5</sup>)<sup>½</sup>
| ≈ 1.351 211 818{{e|−43}} s
|-----
| [[atomic units|atomic unit of time]] || au
| ≡ [[Bohr radius|a<sub>0</sub>]]/([[fine structure constant|α]]·c)
| ≈ 2.418 884 254{{e|−17}} s
|-----
| [[svedberg]] || S
| ≡ 10<sup>−13</sup> s
| = 100{{e|-13}} s
|-----
| shake ||
| ≡ 10<sup>−8</sup> s
| = 10{{e|-8}} s
|-----
| sigma ||
| ≡ 10<sup>−6</sup> s
| = 10{{e|-6}} s
|-----
| jiffy ||
| ≡ 1/60 s
| ≈ .016667 s
|-----
| jiffy (alternate) ||
| ≡ 1/100 s
| = 10 ms
|-----
| [[helek]] ||
| ≡ 1/1080 h
| ≈ 3.333333 s
|-----
| [[minute]] || min
|
| ≡ 60 s
|-----
| [[Metric time#Alternative units|milliday]] || md
| ≡ 86 400 s / 1000
| ≡ 86.4 s
|-----
| moment ||
| ≡ 90 s
| ≡ 90 s
|-----
| [[ke (unit)|ke]](traditional)||
| ≡ 1/100 d
| ≡ 864 s
|-----
| quarter (of an hour) || [[Ke (unit)|ke]]
| ≡ 1/96 d
| ≡ 900 s
|-----
| [[hour]] || h
| ≡ 60 min
| = 3600 s
|-----
| [[day]] || d
| ≡ 24 h
| = 86 400 s
|-----
| [[week]] || wk
| ≡ 7 d
| = 604 800 s
|-----
| [[fortnight]] ||
| ≡ 2 wk
| = 1 209 600 s
|-----
| [[month]] (hollow) || mo
| ≡ 29 d
| = 2 505 600 s
|-----
| [[month]] || mo
| ≡ 30 d
| = 2 592 000 s
|-----
| [[month]] (full) || mo
| ≡ 31 d
| = 2 678 400 s
|-----
| [[year]] (Calendar) || a, y, ''or'' yr
| ≡ 365 d
| = 31 536 000 s
|-----
| [[year]] (Gregorian) || a, y, ''or'' yr
| ≡ 365.2425 d
| = 31 556 952 s
|-----
| [[year]] (Julian) || a, y, ''or'' yr
| ≡ 365.25 d
| = 31 557 600 s
|-----
| [[sidereal year]] || a, y, ''or'' yr
| ≡ 365.256363 d
| = 31 558 149.76 s
|-----
| [[Olympiad]] ||
| ≡ 4 a of 365 d
| = 1.2614{{e|8}} s
|-----
| lustre; lustrum ||
| ≡ 5 a of 365 d
| = 1.5768{{e|8}} s
|-----
| [[octaeteris]] ||
| ≡ 8 a of 365 d
| = 2.522 88{{e|8}} s
|-----
| [[decade]] ||
| ≡ 10 a of 365 d
| = 3.1536{{e|8}} s
|-----
| [[enneadecaeteris]]; [[Metonic cycle]] ||
| ≡ 110 mo (hollow) + 125 mo (full) = 19 a of 365 d
| = 5.996 16{{e|8}} s
|-----
| [[Callippic cycle]] ||
| ≡ 441 mo (hollow) + 499 mo (full) = 76 a of 365.25 d
| = 2.398 377 6{{e|9}} s
|-----
| [[century]] (Calendar) ||
| ≡ 100 a of 365 d
| = 3.1536{{e|9}} s
|-----
| [[century]] (Julian) ||
| ≡ 100 a of 365.25 d
| = 3.155 76{{e|9}} s
|-----
| [[Hipparchic cycle]] ||
| ≡ 4 Callippic cycles - 1 d
| = 9.593 424{{e|9}} s
|-----
| [[millennium]] (Calendar) ||
| ≡ 1000 a of 365 d
| = 3.1536{{e|10}} s
|-----
| [[millennium]] (Gregorian) ||
| ≡ 1000 a of 365.2425 d
| = 3.155 695 2{{e|10}} s
|-----
| [[millennium]] (Julian) ||
| ≡ 1000 a of 365.25 d
| = 3.155 76{{e|10}} s
|-----
| [[Sothic cycle]] ||
| ≡ 1461 a of 365 d
| = 4.607 409 6{{e|10}} s
|}
===Speed or velocity===
{{disputedsection}}
{| class="wikitable"
|+ [[Speed]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[metre per second]] (SI unit)|| m/s
|
| ≡ 1 m/s
|-----
| [[foot (unit of length)|foot]] per [[hour]] || fph
| ≡ 1 ft/h
| ≈ 8.466 667{{e|−5}} m/s
|-----
| [[furlong]] per [[fortnight]] ||
| ≡ furlong/fortnight
| ≈ 1.663 095{{e|−4}} m/s
|-----
| [[inch]] per [[minute]] || ipm
| ≡ 1 in/min
| ≈ 4.23 333{{e|−4}} m/s
|-----
| [[foot (unit of length)|foot]] per [[minute]] || fpm
| ≡ 1 ft/min
| = 5.08{{e|−3}} m/s
|-----
| [[inch]] per [[second]] || ips
| ≡ 1 in/s
| = 2.54{{e|−2}} m/s
|-----
| [[kilometre per hour]] || km/h
| ≡ 1 km/h
| ≈ 2.777 778{{e|−2}} m/s
|-----
| [[foot (unit of length)|foot]] per [[second]] || fps
| ≡ 1 ft/s
| = 3.048{{e|−1}} m/s
|-----
| [[mile per hour]] || mph
| ≡ 1 mi/h
| = 0.447 04 m/s
|-----
| [[knot (speed)|knot]] || kn
| ≡ 1 [[nautical mile|NM]]/h = 1.852 km/h
| ≈ 0.514 444 m/s
|-----
| [[knot (speed)|knot]] (Admiralty) || kn
| ≡ 1 NM (Adm)/h = 1.853 184 km/h
| ≈ 0.514 773 m/s
|-----
| [[mile]] per [[minute]] || mpm
| ≡ 1 mi/min
| = 26.8224 m/s
|-----
| [[mile]] per [[second]] || mps
| ≡ 1 mi/s = 1.609 344 km/s
| = 1609.344 m/s
|-----
| [[speed of light]] in vacuum || ''c''
| ≡ 2.997 924 58{{e|8}} m/s
| = 2.997 924 58{{e|8}} m/s
|-----
| [[speed of sound]] in air || ''s''
| ≡ 770 mph = 1230 km/h
| ≈ 344 m/s
|-----
| [[mach]] || ''M''
| ≡ 331 m/s
| ≈ 331 m/s
|}
A [[velocity]] consists of a speed combined with a direction; the speed part of the velocity takes units of speed.
===Acceleration===
{| class="wikitable"
|+ [[Acceleration]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[metre per second squared]] (SI unit)|| m/s²
| ≡ 1 m/s²
| = 1 m/s²
|-----
| [[foot (unit of length)|foot]] per [[hour]] per [[second]] || fph/s
| ≡ 1 ft/(h·s)
| ≈ 8.466 667{{e|−5}} m/s²
|-----
| [[inch]] per [[minute]] per [[second]] || ipm/s
| ≡ 1 in/(min·s)
| ≈ 4.233 333{{e|−4}} m/s²
|-----
| [[foot (unit of length)|foot]] per [[minute]] per [[second]] || fpm/s
| ≡ 1 ft/(min·s)
| = 5.08{{e|−3}} m/s²
|-----
| [[Galileo (unit)|galileo]] || Gal
| ≡ 1 cm/s²
| = 10<sup>−2</sup> m/s²
|-----
| [[inch]] per [[second]] squared || ips²
| ≡ 1 in/s²
| = 2.54{{e|−2}} m/s²
|-----
| [[foot (unit of length)|foot]] per [[second]] squared || fps²
| ≡ 1 ft/s²
| = 3.048{{e|−1}} m/s²
|-----
| [[mile]] per [[hour]] per [[second]] || mph/s
| ≡ 1 mi/(h·s)
| = 4.4704{{e|−1}} m/s²
|-----
| [[knot (speed)|knot]] per [[second]] || kn/s
| ≡ 1 kn/s
| ≈ 5.144 444{{e|−1}} m/s²
|-----
| standard [[gravity]] || ''g''
|
| ≡ 9.806 65 m/s²
|-----
| [[mile]] per [[minute]] per [[second]] || mpm/s
| ≡ 1 mi/(min·s)
| = 26.8224 m/s²
|-----
| [[mile]] per [[second]] squared || mps²
| ≡ 1 mi/s²
| = 1.609 344{{e|3}} m/s²
|}
===Force===
{{disputedsection}}
{| class="wikitable"
|+ [[Force (physics)|Force]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[newton]] (SI unit) || N
| ≡ kg·m/s²
| = 1 N
|-----
| [[atomic units|atomic unit of force]] || au
| ≡ m<sub>e</sub>·[[fine structure constant|α]]²·''[[speed of light|c]]''²/[[Bohr radius|a<sub>0</sub>]]
| ≈ 8.238 722 241{{e|−8}} N
|-----
| [[dyne]] ([[cgs unit]]) || dyn
| ≡ g·cm/s²
| = 10<sup>−5</sup> N
|-----
| [[grave (mass)|milligrave]]-force, gravet-force || mGf; gf
| ≡ ''[[standard gravity|''g'']]'' × 1 g
| = 9.806 65 mN
|-----
| [[poundal]] || pdl
| ≡ 1 lb·ft/s²
| = 0.138 254 954 376 N
|-----
| [[ounce-force]] || ozf
| ≡ ''g'' × 1 oz
| = 0.278 013 850 953 781 2 N
|-----
| [[pound-force]] || [[lbf]]
| ≡ ''g'' × 1 lb
| = 4.448 221 615 260 5 N
|-----
| [[kilogram-force]]; kilopond; [[grave (mass)|grave]]-force || kgf; kp; Gf
| ≡ ''g'' × 1 kg
| = 9.806 65 N
|-----
| sthene ([[Metre-tonne-second system of units|mts]] unit) || sn
| ≡ 1 t·m/s²
| = 1 {{e|−3}} N
|-----
| [[kip (unit)|kip]]; kip-force || kip; kipf; klbf
| ≡ ''g'' × 1000 lb
| = 4.448 221 615 260 5 {{e|3}} N
|-----
| [[ton]]-force || tnf
| ≡ ''g'' × 1 sh tn
| = 8.896 443 230 521 {{e|3}} N</td>
|}
''See also:'' [[Weight#Conversion between weight (force) and mass|Conversion between weight (force) and mass]]
===Pressure or mechanical stress===
{{disputedsection}}
{| class="wikitable"
|+ [[Pressure]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[Atmospheric pressure|atmosphere]] (standard) || atm
|
| ≡ 101 325 Pa <ref name=press811>Barry N. Taylor, (April 1995), [http://physics.nist.gov/cuu/pdf/sp811.pdf ''Guide for the Use of the International System of Units (SI)''] (NIST Special Publication 811), Washington, DC: U.S. Government Printing Office, pp. 57–68.</ref>
|-----
| [[Atmospheric pressure|atmosphere]] (technical) || at
| ≡ 1 kgf/cm²
| = 9.80665 {{e|4}} Pa <ref name=press811/>
|-----
| [[bar (unit)|bar]] || bar
|
| ≡ 10<sup>5</sup> Pa
|-----
| barye ([[cgs unit]]) ||
| ≡ 1 dyn/cm²
| = 0.1 Pa
|-----
| centimetre of mercury || cmHg
| ≡ 13 595.1 kg/m³ × 1 cm × ''g''
| ≈ 1.333 22 {{e|−3}} Pa <ref name=press811/>
|-----
| centimetre of [[water]] (4 °C) || cmH<sub>2</sub>O
| ≈ 999.972 kg/m³ × 1 cm × ''g''
| ≈ 98.0638 Pa <ref name=press811/>
|-----
| [[foot (unit of length)|foot]] of mercury (conventional)|| ftHg
| ≡ 13 595.1 kg/m³ × 1 ft × ''g''
| ≈ 40.636 66 {{e|3}} Pa <ref name=press811/>
|-----
| [[foot (unit of length)|foot]] of [[water]] (39.2 °F) || ftH<sub>2</sub>O
| ≈ 999.972 kg/m³ × 1 ft × ''g''
| ≈ 2.988 98 {{e|3}} Pa <ref name=press811/>
|-----
| [[inch]] of mercury (conventional) || inHg
| ≡ 13 595.1 kg/m³ × 1 in × ''g''
| ≈ 3.386 389 {{e|3}} Pa <ref name=press811/>
|-----
| [[inch]] of [[water]] (39.2 °F) || inH<sub>2</sub>O
| ≈ 999.972 kg/m³ × 1 in × ''g''
| ≈ 249.082 Pa <ref name=press811/>
|-----
| kilogram-force per square millimetre || kgf/mm²
| ≡ 1 kgf/mm²
| = 9.806 65 {{e|6}} Pa <ref name=press811/>
|-----
| [[kip (unit)|kip]] per square [[inch]] || ksi
| ≡ 1 kipf/sq in
| ≈ 6.894757 {{e|6}} Pa <ref name=press811/>
|-----
| [[torr|millimetre of mercury]] || [[mmHg]]
| ≡ 13 595.1 kg/m³ × 1 mm × ''g'' ≈ 1 torr
| ≈ 133.322 4 Pa <ref name=press811/>
|-----
| millimetre of [[water]] (3.98 °C) || mmH<sub>2</sub>O
| ≈ 999.972 kg/m³ × 1 mm × ''g'' = 0.999972 kgf/m²
| = 9.806 38 Pa
|-----
| [[pascal (unit)|pascal]] (SI unit) || Pa
| ≡ N/m² = kg/(m·s²)
| = 1 Pa <ref>Barry N. Taylor, (April 1995), ''Guide for the Use of the International System of Units (SI)'' (NIST Special Publication 811), Washington, DC: U.S. Government Printing Office, p. 5.</ref>
|-----
| pièze ([[Metre-tonne-second system of units|mts]] unit) || pz
| ≡ 1000 kg/m·s²
| = 1 {{e|−3}} Pa
|-----
| [[pound (mass)|pound]] per square [[foot (unit of length)|foot]] || psf
| ≡ 1 lbf/ft²
| ≈ 47.880 25 Pa <ref name=press811/>
|-----
| [[poundal]] per square [[foot (unit of length)|foot]] || pdl/sq ft
| ≡ 1 pdl/sq ft
| ≈ 1.488 164 Pa <ref name=press811/>
|-----
| [[Pound-force per square inch|pound per square inch]] || psi
| ≡ 1 lbf/in²
| ≈ 6.894 757 {{e|+3}} Pa <ref name=press811/>
|-----
| short [[ton]] per square [[foot (unit of length)|foot]] ||
| ≡ 1 sh tn × ''g'' / 1 sq ft
| ≈ 95.760 518 {{e|+3}} Pa
|-----
| [[torr]] || torr
| ≡ 101 325/760 Pa
| ≈ 133.322 4 Pa <ref name=press811/>
|}
===Torque===<!-- not equivalent to energy -->
{| class="wikitable"
|+ [[Torque]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[Newton metre]] (SI unit) || N·m
| ≡ N × m<!-- ≠ J --> = kg·m²/s²
| = 1 N·m
|-----
| [[foot (unit of length)|foot]]-poundal || ft pdl
| ≡ 1 lb·ft²/s²
| = 4.214 011 009 380 48{{e|−2}} N·m
|-----
| [[inch-pound force]] || in lbf
| ≡ ''g'' × 1 lb × 1 in
| = 0.112 984 829 027 616 7 N·m
|-----
| [[foot-pound force]] || ft lbf
| ≡ ''g'' × 1 lb × 1 ft
| = 1.355 817 948 331 400 4 N·m
|}
===Energy===<!--work, heat, etc. not torque -->
{| class="wikitable"
|+ [[Energy]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[joule]] (SI unit) || J
| ≡ m·N<!-- ≠ N·m --> = W·s = V·A·s = kg·m²/s²
| = 1 J
|-----
| [[Electron volt|electronvolt]] || eV
| ≡ ''[[elementary charge|e]]'' × 1 V
| ≈ 1.602 176{{e|−19}} J
|-----
| [[Johannes Robert Rydberg|rydberg]] || Ry
| ≡ ''[[Rydberg constant|R<sub>∞</sub>]]''·[[Planck constant|ℎ]]·''[[speed of light|c]]''
| ≈ 2.179 872{{e|−18}} J
|-----
| [[hartree]] || E<sub>h</sub>
| ≡ m<sub>e</sub>·[[fine structure constant|α]]²·''[[speed of light|c]]''² (= 2 Ry)
| ≈ 4.359 744{{e|−18}} J
|-----
| [[atomic units|atomic unit of energy]] || au
| ≡ E<sub>h</sub>
| ≈ 4.359 744{{e|−18}} J
|-----
| [[erg]] ([[cgs unit]]) || erg
| ≡ 1 g·cm²/s²
| = 10<sup>−7</sup> J
|-----
| [[foot (unit of length)|foot]]-poundal || ft pdl
| ≡ 1 lb·ft²/s²
| = 4.214 011 009 380 48{{e|−2}} J
|-----
| cubic centimetre of [[Atmosphere (unit)|atmosphere]]; standard cubic centimetre || cc atm; scc
| ≡ 1 atm × 1 cm³
| = 0.101 325 J
|-----
| [[inch-pound force]] || in lbf
| ≡ ''g'' × 1 lb × 1 in
| = 0.112 984 829 027 616 7 J
|-----
| [[foot-pound force]] || ft lbf
| ≡ ''g'' × 1 lb × 1 ft
| = 1.355 817 948 331 400 4 J
|-----
| [[calorie]] (20 °C) || cal<sub>20 °C</sub>
|
| ≈ 4.1819 J
|-----
| [[calorie]] (thermochemical) || cal<sub>th</sub>
|
| ≡ 4.184 J
|-----
| [[calorie]] (15 °C) || cal<sub>15 °C</sub>
|
| ≡ 4.1855 J
|-----
| [[calorie]] (International Table) || cal<sub>IT</sub>
|
| ≡ 4.1868 J
|-----
| [[calorie]] (mean) || cal<sub>mean</sub>
|
| ≈ 4.190 02 J
|-----
| [[calorie]] (3.98 °C) || cal<sub>3.98 °C</sub>
|
| ≈ 4.2045 J
|-----
| kilocalorie; large [[calorie]] || kcal; Cal
| ≡ 1000 cal<sub>IT</sub>
| = 4.1868 {{e|3}} J
|-----
| [[litre]]-[[Atmosphere (unit)|atmosphere]] || l atm; sl
| ≡ 1 atm × 1 L
| = 101.325 J
|-----
| [[gallon]]-atmosphere (US) || US gal atm
| ≡ 1 atm × 1 gal (US)
| = 383.556 849 013 8 J
|-----
| [[gallon]]-atmosphere (imperial) || imp gal atm
| ≡ 1 atm × 1 gal (imp)
| = 460.632 569 25 J
|-----
| [[BTU|British thermal unit]] (thermochemical) || BTU<sub>th</sub>
|
| ≈ 1.054 350 {{e|3}} J
|-----
| [[BTU|British thermal unit]] (ISO) || BTU<sub>ISO</sub>
|
| ≡ 1.0545 {{e|3}} J
|-----
| [[BTU|British thermal unit]] (63 °F) || BTU<sub>63 °F</sub>
|
| ≈ 1.0546 {{e|3}} J
|-----
| [[BTU|British thermal unit]] (60 °F) || BTU<sub>60 °F</sub>
|
| ≈ 1.054 68 {{e|3}} J
|-----
| [[BTU|British thermal unit]] (59 °F) || BTU<sub>59 °F</sub>
|
| ≡ 1.054 804 {{e|3}} J
|-----
| [[BTU|British thermal unit]] (International Table) || BTU<sub>IT</sub>
|
| = 1.055 055 852 62 {{e|3}} J
|-----
| [[BTU|British thermal unit]] (mean) || BTU<sub>mean</sub>
|
| ≈ 1.055 87 {{e|3}} J
|-----
| [[BTU|British thermal unit]] (39 °F) || BTU<sub>39 °F</sub>
|
| ≈ 1.059 67 {{e|3}} J
|-----
| [[Celsius]] heat unit (International Table) || CHU<sub>IT</sub>
| ≡ 1 BTU<sub>IT</sub> × 1 K/°R
| = 1.899 100 534 716 {{e|3}} J
|-----
| cubic [[foot (unit of length)|foot]] of atmosphere; standard cubic [[foot (unit of length)|foot]] || cu ft atm; scf
| ≡ 1 atm × 1 ft³
| = 2.869 204 480 934 4 {{e|3}} J
|-----
| cubic [[yard]] of atmosphere; standard cubic [[yard]] || cu yd atm; scy
| ≡ 1 atm × 1 yd³
| = 77.468 520 985 228 8 {{e|3}} J
|-----
| cubic [[foot (unit of length)|foot]] of natural gas ||
| ≡ 1000 BTU<sub>IT</sub>
| = 1.055 055 852 62 {{e|6}} J
|-----
| [[horsepower]]-[[hour]] || hp·h
| ≡ 1 hp × 1 h
| = 2.684519537696172792 {{e|6}} J
|-----
| [[kilowatt-hour]]; Board of Trade Unit || kW·h; B.O.T.U.
| ≡ 1 kW × 1 h
| = 3.6 {{e|6}} J
|-----
| thermie || th
| ≡ 1 Mcal<sub>IT</sub>
| = 4.1868 {{e|6}} J
|-----
| therm (U.S.) ||
| ≡ 100 000 BTU<sub>59 °F</sub>
| = 105.4804 {{e|6}} J
|-----
| therm (E.C.) ||
| ≡ 100 000 BTU<sub>IT</sub>
| = 105.505 585 262 {{e|6}} J
|-----
| [[ton]] of [[trinitrotoluene|TNT]] || tTNT
| ≡ 1 Gcal<sub>th</sub>
| = 4.184 {{e|9}} J
|-----
| [[barrel of oil equivalent]] || bboe
| ≈ 5.8 MBTU<sub>59 °F</sub>
| ≈ 6.12 {{e|9}} J
|-----
| [[ton of coal equivalent]] || TCE
| ≡ 7 Gcal<sub>th</sub>
| = 29.3076 {{e|9}} J
|-----
| [[ton of oil equivalent]] || TOE
| ≡ 10 Gcal<sub>th</sub>
| = 41.868 {{e|9}} J
|-----
| [[quad (energy)|quad]] ||
| ≡ 10<sup>15</sup> BTU<sub>IT</sub>
| = 1.055 055 852 62{{e|18}} J
|}
===Power===
{| class="wikitable"
|+ [[Power (physics)|Power]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[watt]] (SI unit) || W
| ≡ J/s = N·m/s = kg·m²/s³
| = 1 W
|-----
| lusec || lusec
| ≡ 1 L·µmHg/s <ref>Russ Rowlett. (2005). ''How Many: A Dictionary of Units of Measure''. Viewed [[5 November]] 2006 at http://www.unc.edu/~rowlett/units/</ref>
| ≈ 1.333{{e|−4}} W
|-----
| [[foot (unit of length)|foot]]-[[pound-force]] per [[hour]] || ft lbf/h
| ≡ 1 ft lbf/h
| ≈ 3.766 161{{e|−4}} W
|-----
| atmosphere cubic centimetre per [[minute]] || atm ccm
| ≡ 1 atm × 1 cm³/min
| = 1.688 75{{e|−3}} W
|-----
| [[foot (unit of length)|foot]]-[[pound-force]] per [[minute]] || ft lbf/min
| ≡ 1 ft lbf/min
| = 2.259 696 580 552 334{{e|−2}} W
|-----
| atmosphere–cubic centimetre per [[second]] || atm ccs
| ≡ 1 atm × 1 cm³/s
| = 0.101 325 W
|-----
| [[BTU]] (International Table) per [[hour]] || BTU<sub>IT</sub>/h
| ≡ 1 BTU<sub>IT</sub>/h
| ≈ 0.293 071 W
|-----
| atmosphere–cubic [[foot (unit of length)|foot]] per [[hour]] || atm cfh
| ≡ 1 atm × 1 cu ft/h
| = 0.797 001 244 704 W
|-----
| [[foot (unit of length)|foot]]-[[pound-force]] per [[second]] || ft lbf/s
| ≡ 1 ft lbf/s
| = 1.355 817 948 331 400 4 W
|-----
| [[litre]]-atmosphere per [[minute]] || L·atm/min
| ≡ 1 atm × 1 L/min
| = 1.688 75 W
|-----
| [[calorie]] (International Table) per [[second]] || cal<sub>IT</sub>/s
| ≡ 1 cal<sub>IT</sub>/s
| = 4.1868 W
|-----
| [[BTU]] (International Table) per [[minute]] || BTU<sub>IT</sub>/min
| ≡ 1 BTU<sub>IT</sub>/min
| ≈ 17.584 264 W
|-----
| atmosphere-cubic [[foot (unit of length)|foot]] per [[minute]] || atm·cfm
| ≡ 1 atm × 1 cu ft/min
| = 47.820 074 682 24 W
|-----
| square [[foot (unit of length)|foot]] equivalent direct radiation || sq ft EDR
| ≡ 240 BTU<sub>IT</sub>/h
| ≈ 70.337 057 W
|-----
| litre-atmosphere per second || L·atm/s
| ≡ 1 atm × 1 L/s
| = 101.325 W
|-----
| [[horsepower]] (metric) || hp
| ≡ 75 m kgf/s
| = 735.498 75 W
|-----
| [[horsepower]] (European electrical) || hp
| ≡ 75 kp·m/s
| = 736 W
|-----
| [[horsepower]] (Imperial mechanical) || hp
| ≡ 550 ft lbf/s
| = 745.699 871 582 270 22 W
|-----
| [[horsepower]] (Imperial electrical) || hp
|
| ≡ 746 W
|-----
| [[ton]] of air conditioning ||
| ≡ 1 t × 1005 J/kg × 1 °R/K ÷ 10 min
| ≈ 844.2 W
|-----
| [[poncelet]] || p
| ≡ 100 m kgf/s
| = 980.665 W
|-----
| [[BTU]] (International Table) per [[second]] || BTU<sub>IT</sub>/s
| ≡ 1 BTU<sub>IT</sub>/s
| = 1.055 055 852 62{{e|3}} W
|-----
| atmosphere-cubic [[foot (unit of length)|foot]] per [[second]] || atm cfs
| ≡ 1 atm × 1 cu ft/s
| = 2.869 204 480 934 4{{e|3}} W
|-----
| [[ton]] of refrigeration (IT) ||
| ≡ 1 BTU<sub>IT</sub> × 1 sh tn/lb ÷ 10 min/s
| ≈ 3.516 853{{e|3}} W
|-----
| [[ton]] of refrigeration (Imperial) ||
| ≡ 1 BTU<sub>IT</sub> × 1 lng tn/lb ÷ 10 min/s
| ≈ 3.938 875{{e|3}} W
|-----
| boiler [[horsepower]] || bhp
| ≈ 34.5 lb/h × 970.3 BTU<sub>IT</sub>/lb
| ≈ 9.810 657{{e|3}} W
|}
===Angular momentum===
{| class="wikitable"
|+ Action, Angular momentum
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| SI unit || J·s
| ≡ kg·m²/s
| = 1 J·s
<!--- previous entry was:
|-----
| [[atomic unit of action]] || au
| [[Dirac constant|<math>\hbar</math>]] = [[Planck constant|<math>h</math>]]/2[[Pi|<math>\pi</math>]] 1.054 571 596{{e|−34}} J·s
--->
|-----
| [[atomic units|atomic unit of action]] || au
| ≡ [[Dirac constant|ℏ]] = [[Planck constant|ℎ]]/2[[Pi|π]]
| ≈ 1.054 571 596{{e|−34}} J·s
|-----
| [[cgs unit]] || erg·s
|
| = 10<sup>−7</sup> J·s
|}
===Electric current===
{| class="wikitable"
|+ [[Electric current]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[ampere]] ([[SI base unit]]) || A
|
| 1 A
|-----
| [[esu per second]]; statampere ([[cgs unit]]) || esu/s
| ≡ (0.1 A·m/s) /''[[speed of light|c]]''
| ≈ 3.335 641{{e|−10}} A
|-----
| [[electromagnetic unit]]; abampere ([[cgs unit]]) || abamp
|
| ≡ 10 A
|}
===Electric charge===
{| class="wikitable"
|+ [[Electric charge]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[coulomb]] (SI unit) || C
| ≡ A·s
| = 1 C
|-----
| [[atomic units|atomic unit of charge]] || au
| ≡ ''[[elementary charge|e]]''
| ≈ 1.602 176 462{{e|−19}} C
|-----
| [[statcoulomb]]; [[franklin (unit)|franklin]]; electrostatic unit ([[cgs unit]]) || statC; Fr; esu
| ≡ (0.1 A·m) /''[[speed of light|c]]''
| ≈ 3.335 641{{e|−10}} C
|-----
| [[abcoulomb]]; electromagnetic unit ([[cgs unit]]) || abC; emu
|
| ≡ 10 C
|-----
| [[faraday]] || F
| ≡ 1 mol × ''[[Avogadro's number|N<sub>A</sub>]]''·''[[elementary charge|e]]''
| ≈ 96,485.3383 C
|}
===Electromotive force===
{| class="wikitable"
|+ [[Voltage]], Electromotive force
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[volt]] (SI unit) || V
| ≡ kg·m²/(A·s³)
| = 1 V
|-----
| [[abvolt]] ([[cgs unit]]) || abV
|
| ≡ 1{{e|−8}} V
|-----
| [[statvolt]] ([[cgs unit]]) || statV
| ≡ ''[[speed of light|c]]''· (1 μJ/A·m)
| = 299.792 458 V
|}
===Electrical resistance===
{| class="wikitable"
|+ [[Electrical resistance]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[Ohm (unit)|ohm]] (SI unit) || Ω
| ≡ V/A
| = kg·m²/(A²·s³)
|}
===Inductance===
{| class="wikitable"
|+ [[Inductance]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[Henry (unit)|henry]] (SI unit) || H
| ≡ (m²×kg)/(s²×A²) = (V×s)/A = (J×s²)/C² = (m²×kg)/C²
| = 1 H
|}
===Dynamic viscosity===
{| class="wikitable"
|+ Dynamic [[viscosity]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[pascal second]] (SI unit) || Pa·s
| ≡ N·s/m² , kg/(m·s)
| = 1 Pa·s
|-----
| [[poise]] ([[cgs unit]]) || P
|
| ≡ 10<sup>−1</sup> Pa·s
|}
===Kinematic viscosity===
{| class="wikitable"
|+ Kinematic [[viscosity]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI|SI units]]
|-----
| SI unit || m²/s
| ≡ m²/s
| = 1 m²/s
|-----
| [[Stokes (unit)|stokes]] ([[cgs unit]]) || St
|
| ≡ 10<sup>−4</sup> m²/s
|}
===Information entropy===
{| class="wikitable"
|+ [[Information entropy]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI|SI units]]
|-----
| SI unit || J/K
| ≡ J/K
| = 1 J/K
|-----
| [[nat (information)|nat]]; nip; nepit || nat
| ≡ ''k<sub>B</sub>''
| = 1.3806505(23) × 10<sup>−23</sup> J/K
|-----
| [[bit]]; shannon || bit; b; Sh
| ≡ ln(2) × ''k<sub>B</sub>''
| = 9.569940(16) × 10<sup>−24</sup> J/K
|-----
| [[ban (information)|ban]]; hartley || ban; Hart
| ≡ ln(10) × ''k<sub>B</sub>''
| = 3.1790653(53) × 10<sup>−23</sup> J/K
|-----
| [[nibble]] ||
| ≡ 4 bits
| = 3.8279760(64) × 10<sup>−23</sup> J/K
|-----
| [[byte]] || B
| ≡ 8 bits
| = 7.655952(13) × 10<sup>−23</sup> J/K
|-----
| [[kilobyte]] (decimal) || kB
| ≡ 1000 B
| = 7.655952(13) × 10<sup>−20</sup> J/K
|-----
| [[kilobyte]] ([[kibibyte]]) || KB; KiB
| ≡ 1024 B
| = 7.839695(13) × 10<sup>−20</sup> J/K
|}
Often, information entropy is measured in shannons, whereas the (discrete) storage space of digital devices is measured in bits. Thus, uncompressed redundant data occupy more than one bit of storage per shannon of information entropy. The multiples of a bit listed above are usually used with this meaning. Other times the bit is used as a measure of information entropy and is thus a synonym of shannon.
===Temperature===
''Note: see [[Temperature conversion]] for more detail''
{| class="wikitable"
|+ [[Temperature]]
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[kelvin]] ([[SI base unit]]) || K
|
| 1 K
|-----
| degree [[Celsius]] || °C
|
| [K] = [°C] + 273.15
|-----
| degree [[Rankine scale|Rankine]] || °R; °Ra
|
| [K] = [°R] × 5⁄9
|-----
| degree [[Fahrenheit]] || °F
|
| [K] = ([°F] + 459.67) × 5⁄9
|----
| degree [[Delisle]] || °De
|
| [K] = 373.15 − [°De] × 2⁄3
|----
| degree [[Newton]] || °N
|
| [K] = [°N] × 100⁄33 + 273.15
|----
| degree [[Réaumur]] || °Ré
|
| [K] = [°Ré] × 5⁄4 + 273.15
|----
| degree [[Rømer]] || °Rø
|
| [K] = ([°Rø] − 7.5) × 40⁄21 + 273.15
|}
===Radioactivity===
{| class="wikitable"
|+ [[Radioactivity]]
|-----
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[Becquerel]] ([[SI base unit]]) || Bq
| ≡ disintegration per second s<sup>-1<sup>
| = 1 Bq
|-----
| [[Rutherford]] || rd
| ≡ 1 MBq
| = 1 * 10<sup>6</sup> Bq
|-----
| [[curie]] || Ci
| ≡ 3.7 * 10<sup>10</sup> Bq
| = 3.7 * 10<sup>10</sup> Bq<ref name="SP811-2008">Ambler Thompson & Barry N. Taylor. (2008). [http://physics.nist.gov/cuu/pdf/sp811.pdf ''Guide for the Use of the International System of Units (SI)''.] (Special Publication 811. Gaithersburg, MD: [[National Institute of Standards and Technology]]. p. 10.</ref>
|}
===Radioactivity - absorbed dose===
{| class="wikitable"
|+ Radioactivity - [[absorbed dose]]
|-----
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[gray]] || Gy
| ≡ 1J/kg = 1m<sup>2</sup>·s<sup>-2</sup><ref>Ambler Thompson & Barry N. Taylor. (2008). [http://physics.nist.gov/cuu/pdf/sp811.pdf ''Guide for the Use of the International System of Units (SI)''.] (Special Publication 811. Gaithersburg, MD: [[National Institute of Standards and Technology]]. p. 5.</ref>
| = 1 Gy
|-----
| [[rad]] || rad
| ≡ 0.01 Gy
| = 0.01 Gy
|}
===Radioactivity - equivalent dose===
{| class="wikitable"
|+ Radioactivity - [[equivalent dose]]
|-----
!Name of unit
!Symbol
!Definition
!Relation to [[SI]] units
|-----
| [[Sievert]] ([[SI base unit]]) || Sv
|
| = 1 Sv
|-----
| [[Röntgen equivalent man]] || rem
| ≡ 0.01 Sv
| = 0.01 Sv
|}
== Software tools ==
Home and office computers come with converters in bundled spreadsheet applications or can access free converters via the Internet. Units and measurements can be easily converted using these tools, but only if the units are explicitly defined and the conversion is compatible (e.g., cmHg to kPa).
===Free conversion software===
* [[Units (Unix)|Units (Unix program)]] — a popular command-line utility.
===General commercial sources of converters===
*[[calculator#Advanced electronic calculators|Advanced electronic calculators]] have unit-conversion functionality.
*[[Spreadsheet]] programs usually provide conversion [[Function (computer science)|function]]s or [[formula]]s or the user can write their own.
*Commercial mathematical, scientific and technical applications often include converters.
==References==
{{reflist}}
{{refbegin}}
*Klein, Herbert. 1988. ''The science of measurement: A historical survey''. New York: Dover Publications.
{{refend}}
== See also ==
<div class="references-small" style="-moz-column-count:2; column-count:2;">
{{Wikibookspar||FHSST Physics Units:How to Change Units}}
*[[Units of measurement]]
*[[Units conversion by factor-label]]
*[[False precision]]
*[[Accuracy and precision]]
*[[Significant figures]]
*[[Approximate conversion of units]].
*[[Temperature conversion formulas]] for conversions involving additional temperature scales.
*[[SI]]
*[[English unit]]
*[[Imperial unit]]
*[[U.S. customary unit]]
</div>
{{-}}
{{Systems of measurement}}
== External links ==
<!-- ATTENTION! Please do not add links without discussion and consensus on the talk page. Undiscussed links will be removed. -->
*[http://www.unc.edu/~rowlett/units/ ''A dictionary of units of measurement'']
*[http://physics.nist.gov/cuu/Document/nonsi_in_1998.pdf NIST: Fundamental physical constants — Non-SI units] (PDF)
*[http://www.hmso.gov.uk/si/si1995/Uksi_19951804_en_2.htm British law: Units of measurement regulations 1995]
*[http://aurora.rg.iupui.edu/~schadow/units/UCUM/ucum.html The Unified Code for Units of Measure]
*[http://www.posc.org/refs/poscUnits20.xml Units, Symbols, and Conversions XML Dictionary]
[[Category:Units of measure]]
[[Category:Metrication]]
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[[fr:Conversion des unités]]
[[hr:Pretvorba mjernih jedinica]]
[[hu:Mértékegységek átszámítása]]
[[ja:単位の換算一覧]]
[[pt:Tabela de conversão de unidades]]
[[sh:Konverzija mjernih jedinica]]