Standard Units
| Unit | Symbol | Definition | Comments |
|---|---|---|---|
| Time | |||
| second | sec | 1 s | - |
| minute | min | 60 s | - |
| hour | hr | 60 min | - |
| hour | hour | 1 hr | alternate symbol |
| hour | h | 1 hr | alternate symbol |
| day | day | 24 hr | - |
| shake | shake | 10 ns | - |
| Hertz | Hz | 1 s^-1 | - |
| Length or Distance | |||
| international foot | ft | 0.3048 m | - |
| inch | in | 1.0/12.0 ft | - |
| international mile | mile | 5280.0 ft | - |
| international mile | mi | 1 mile | alternate symbol |
| milli-inch | mil | 0.001 in | - |
| Parsec | pc | 3.085678e16 m | - |
| League | league | 3 mile | - |
| Astronomical Unit | ua | 1.49598e11 m | - |
| Astronomical Unit | AU | 1.49598e11 m | alternate symbol |
| yard | yd | 3 ft | - |
| Angstrom | Ang | 1e-10 m | - |
| Angstrom | \\AA | 1 Ang | alternate symbol |
| furlong | furlong | 220 yd | - |
| fathom | fathom | 6 ft | - |
| Rod | rd | 16.5 ft | - |
| U.S. survey foot | sft | (1200./3937.) m | - |
| U.S. survey mile | smi | 5280 sft | also called statue mile |
| point | pt | 1./72. in | Typeface Point |
| pica | pica | 1./6. in | Typeface Pica |
| Temperature | |||
| Celsius | C | 1 K -273.15 | - |
| Rankine | R | 5.0/9.0 K | - |
| Fahrenheit | F | 1 R -459.67 | - |
| Mass | |||
| gram | g | 0.001 kg | This is case sensitive. |
| gram | gm | g | (alternate symbol) |
| pound mass | lbm | 0.45359237 kg | (avoirdupois) |
| Troy pound | lbt | 0.3732417 kg | (apothecary) |
| carat (metric) | carat | 0.2 g | - |
| slug | slug | 1 lb sec^2/ft | - |
| snail | snail | 1 lb sec^2/in | - |
| Short Ton | ton | 2000 lbm | - |
| Long Ton | ton_l | 2240 lbm | - |
| Ounce | oz | 28.34952 g | (avoirdupois) |
| Grain | gr | 64.79891 mg | - |
| Pennyweight | dwt | 1.55174 g | - |
| Force or Weight | |||
| Newton | N | 1 kg m/s^2 | - |
| Dyne | dyn | 1e-5 N | - |
| pound force | lb | lbm G | - |
| pound force | lbf | lbm G | - |
| poundal | poundal | 1 lbm ft/sec^2 | - |
| kilopound | kip | 1000 lbf | - |
| kilogram force | kgf | kg G | - |
| Energy | |||
| Joule | J | 1 N m | - |
| British Therm. Unit | BTU | 1055.056 J | (International Table) |
| British Therm. Unit | Btu | 1 BTU | alternate symbol |
| British Therm. Unit | BTU_th | 1054.350 J | (Thermochemical) |
| calorie | cal | 4.1868 J | (International Table) |
| calorie | cal_th | 4.184 J | (Thermochemical) |
| Calorie | Cal | 4.1868 kJ | (nutritionists) |
| electron volt | eV | 1.602177e-19 J | - |
| erg | erg | 1e-7 J | - |
| Ton of TNT | TNT | 4.184e9 J | - |
| Power | |||
| Watt | W | 1 J/s | - |
| Horse Power | hp | 550 ft lb/s | - |
| Pressure | |||
| bar | bar | 1e5 N/m^2 | - |
| Pascal | Pa | 1 N/m^2 | - |
| Pounds per sq. inch | psi | 1 lb/in^2 | - |
| Pounds per sq. ft. | psf | 1 lb/ft^2 | - |
| kilo psi | ksi | 1000.0 psi | - |
| atmospheres | atm | 1.01325e5 N/m^2 | - |
| inches of Mercury | inHg | 3.387 kPa | - |
| millimeters Mercury | mmHg | 0.1333 kPa | - |
| Torr | torr | 1.333224 Pa | - |
| Volume or Area | |||
| Liter | L | 1/1000.0 m^3 | - |
| gallon | gal | 3.785412 L | - |
| Pint (U.S. liquid) | pint | 1/8. gal | - |
| Quart (U.S. liquid) | qt | 2 pint | - |
| Pint (U.S. dry) | dpint | 0.5506105 L | - |
| Quart (U.S. dry) | dqt | 2 dpint | - |
| Acre | acre | 1/640.0 smi^2 | - |
| Hectare | ha | 10000 m^2 | - |
| Barrel (petroleum) | barrel | 158.9873 L | - |
| Fluid Ounce | oz_fl | 29.57353 mL | - |
| Gill (U.S.) | gi | 0.1182941 L | - |
| Peck (U.S.) | pk | 8.809768 L | - |
| Tablespoon | tbl | 1/32. pint | - |
| Teaspoon | tsp | 1/3. tbl | - |
| Cup | cup | 16. tbl | - |
| Electromagnetism | |||
| Coulomb | Co | 1 A s | Electric Charge |
| Volt | V | 1 W/A | Electric Potential |
| Ohm | ohm | 1 V/A | Electric Resistance |
| Ohm | \\Omega | 1 V/A | alternate symbol |
| Faraday | faraday | 96485.31 Co | Electric Charge |
| Farad | farad | Co/V | Capacitance |
| Stokes | stokes | 1e-4 m^2/s | - |
| Oersted | Oe | 79.57747 A/m | - |
| Webber | Wb | V s | Magnetic flux |
| Tesla | Tesla | Wb/m^2 | Magnetic flux density |
| Henry | H | Wb/A | Inductance |
| Siemens | S | A/V | Electrical Conductance |
| Light and Radiation | |||
| Lux | lux | cd/m^2 | Iluminance |
| Lux | lx | cd/m^2 | - |
| Lumen | lm | cd | Luminous Flux |
| Stilb | sb | 10000 cd/m^2 | - |
| Phot | ph | 10000 lx | - |
| Becquerel | Bq | s^-1 | activity |
| Gray | Gy | J/kg | Absorbed Dose, kerma |
| Sievert | Sv | J/kg | Dose equivalent |
| Other Quantities | |||
| pound mole | lbmole | 1 mol lbm/g | quantity |
| poise | poise | 1 g /sec cm | viscocity |
| Gravity's accel. | G | 9.80665 m/sec^2 | Gravity on Earth |
| Degree | deg | Pi/180 | Can be used to convert from degrees to radians for trig functions. |
| Percent | % | 0.01 | - |
| Knot | knot | 1852 m/hr | velocity |
| Miles per Hour | mph | 1 mi/hr | velocity |
| Gallon/minute | gpm | 1. gal/min | flow rate |
| Revolution/minute | rpm | 360 deg/min | - |