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Conversion of units
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This article lists conversion factors between a number of units.
| Name of unit | Symbol | Relation to SI units |
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| meter (SI base unit) | m | |
| micron | μ | = μm = 10-6 m |
| ångström | Å | = 10-10 m |
| bohr (au) | a0, b | ~ 5.291 77 × 10-11 m |
| x unit | X | ~ 1.002 × 10-13 m |
| Fermi | = 1×10-15 m | |
| inch | in | = 2.54 × 10-2 m |
| foot | ft | = 12 in = 0.3048 m |
| yard | yd | = 3 ft = 0.9144 m |
| mile | mi | = 1760 yd = 1609.344 m |
| nautical mile | = 1852 m = 6076.1 feet | |
| geographical mile | = 1855 m = 6087.15 feet | |
| astronomical unit | AU | = 1.495 978 706 6 × 1011 m |
| parsec | pc | = 3.085 677 580 666 31 × 1016 m |
| light year | l.y. | = 9.460 730 473 × 1015 m |
| light second | = 2.997 924 58 × 108 m | |
| mil | = 1×10-3 in = 2.54 ×10-5 m | |
| Rod | = 5.029 210 058 42 m | |
| Chain | = 20.116 840 233 7 m | |
| Fathom | = 1.828 803 657 61 m | |
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| square metre (SI unit) | m2 | |
| barn | b | 10-28 m2 |
| acre | ~ 4046.856 m2 | |
| are | a | = 100 m2 |
| hectare | ha | = 104 m2 |
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| cubic metre (SI unit) | m3 | |
| litre | l, L | = dm3 = 10-3 m3 |
| lambda | λ | = μl = 10-6 dm3 |
| barrel (US) | ~ 158.987 dm3 | |
| gallon (US) | gal (US) | = 3.785 41 dm3 |
| gallon (UK) | gal (UK) | = 4.546 09 dm3 |
| fluid ounce (US) | fl. oz. (US) | = 29.57 ml |
| fluid ounce (Imperial) | fl. oz. (Imp.) | = 28.41 ml |
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| kilogram (SI base unit) | kg | |
| electron mass (au) | me | ~ 9.109 39 × 10-31 kg |
| unified atomic mass unit, dalton | u, Da | ~ 1.660 540 × 10-27 kg |
| gamma | γ | = μg |
| tonne | t | = 103 kg |
| pound (avoirdupois) | lb, in physics "lbm" | = 0.453 592 37 kg |
| ounce (avoirdupois) | oz | ~ 28.349 5 g |
| ounce (troy) | oz (troy) | ~ 31.103 5 g |
| grain | gr | = 64.798 91 mg |
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| second (SI base unit) | s | |
| au of time | ~ 2.418 88 × 10-17 s | |
| minute | min | = 60 s |
| hour | h | = 3600 s |
| day | d | = 86 400 s (not exactly defined due to leap seconds) |
| year | a | ~ 31 556 952 s |
| svedberg | Sv | ~ 10-13 s |
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| (SI unit) | m·s-2 | |
| standard acceleration of free fall | gn | = 9.806 65 m·s-2 |
| galileo | Gal | = 10-2 m·s-2 |
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| newton (SI unit) | N | = kg·m·s-2 |
| dyne (cgs unit) | dyn | = 10-5N |
| au of force | ~ 8.238 73 × 10-8N | |
| pound-force | lbf | = 4.448 22 N |
| kilogram-force | kgf | = 9.806 65 N |
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| pascal (SI unit) | Pa | = N·m-2 = kg·m-1·s-2 |
| atmosphere | atm | = 101 325 Pa |
| bar | bar | = 105 Pa |
| torr | Torr | = (101 325/760) Pa ~ 133.322 Pa |
| millimetre of mercury (conventional) | mmHg | = 13.5951 × 980.655 × 10-2 Pa ~ 133.322 Pa |
| pounds per square inch | psi | ~ 6.894 757 × 103 Pa |
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| ampere (SI base unit) | A | |
| esu per second (cgs unit) | esu.s-1 | ~ ?? A |
| electromagnetic unit (cgs unit) | abamp | ~ ?? A |
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| coulomb (SI unit) | C | = A.s |
| statcoulomb, electrostatic unit (cgs unit) | statC, esu | ~ 3.335 6 × 10-10 C |
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| volt (SI unit) | V | = N·m·C-1 |
| statvolt (cgs unit) | statV | =299.792458 V |
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| ohm (SI unit) | ohm | = V·A-1 |
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| joule (SI unit) | J = N·m | = kg·m2·s-2 |
| erg (cgs unit) | erg | = 10-7 J |
| hartee (au) | Eh | ~ 4.359 75 × 10-18 J |
| rydberg | Ry | ~ 2.179 87 × 10-18 J |
| electronvolt | eV | = e × V ~ 1.602 18 × 10-19 J |
| calorie, thermochemical | calth | = 4.184 J |
| calorie, international | calIT | = 4.1868 J |
| 15 °C calorie | calIT | ~ 4.1855 J |
| litre atmosphere | l atm | = 101.325 J |
| British thermal unit | Btu | = 1055.06 J |
| Board of Trade Unit or kilowatt-hour | B.O.T.U. or kWh | = 3.6 × 106 J |
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| watt (SI unit) | W | = J·s-1 = N·m·s-1 = kg·m2·s-3 |
| horsepower | hp | = 745.7 W |
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| SI unit | J·s = N·m·s | = kg·m2·s-1 |
| cgs unit | erg·s | = 10-7 J·s |
| au of action | = h/2π = 1.054 57 × 10-34 J·s | |
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| SI unit | Pa·s = N·m-2·s | = kg·m-1·s-1 |
| poise | P | = 10-1Pa·s |
| centipoise | cP | = mPa·s |
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| SI unit | m2·s-1 | |
| stokes | St | = 10-4m2·s-1 |
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| kelvin (SI base unit) | K | |
| degree Celsius | °C | T[°C] = T[K] - 273.15 |
| degree Fahrenheit | °F | T [°F] = 1.8 (T [°C]) + 32 |
| degree Rankine | °R | = (5/9) K |
Note that lbm is pound mass, not pound meter!
- The Unix program units, a useful tool for unit conversion.
- Informal conversion of common units.
- A Dictionary of Units of Measurement (http://www.unc.edu/~rowlett/units/index)
- Frink, a converter, calculator, and programming language (http://futureboy.homeip.net/frinkdocs/)
- An online converter (http://www.sciencemadesimple.com/conversions)
- Various unit converters (http://www.ex.ac.uk/cimt/res2/calcs/calaindx.htm)
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