Base Units
| Name | Symbol | Comment |
| meter | m | length |
| kilogram | kg | mass |
| second | s | time |
| ampere | A | electric current |
| kelvin | K | thermodynamic temperature |
| mole | mol | amount of substance |
| candela | cd | luminous intensity |
Prefixes
| Prefix | Symbol | Factor |
| yotta | Y | 10^{24} |
| zetta | Z | 10^{21} |
| exa | E | 10^{18} |
| peta | P | 10^{15} |
| tera | T | 10^{12} |
| giga | G | 10^9 |
| mega | M | 10^6 |
| kilo | k | 10^3 |
| hecto | h | 10^2 |
| deci | d | 10^-1 |
| centi | c | 10^-2 |
| milli | m | 10^-3 |
| micro | u | 10^-6 |
| nano | n | 10^-9 |
| pico | p | 10^{-12} |
| femto | f | 10^{-15} |
| atto | a | 10^{-18} |
| zepto | z | 10^{-21} |
| yocto | y | 10^{-24} |
Derived Units
| Name | Symbol | Unit | Comment |
| gram | g | 0.001 kg | mass |
| minute | min | 60 s | time |
| hour | hr | 3600. s | time |
| day | day | 24 hr | time |
| year | y | 365.24 d | time |
| pound | lb | 0.45359237 kg | mass |
| ounce | oz | 1.77185E-3 kg | mass |
| inch | in | 2.54 cm | length |
| foot | ft | 12 in | length |
| mile | mi | 5280 ft | length |
| yard | yd | 0.9144 m | length |
| nautical_mile | n_mi | 6080 ft | length, nautical mile (UK) |
| astroUnit | AU | 1.49598E11 m | length, mean earth to sun distance |
| speed of light | c | 2.99792E8 m/s | velocity |
| lightsecond | cs | 2.99792E8 m | length |
| lightminute | cmin | 60 cs | length |
| lighthour | chr | 60 cmin | length |
| lightday | cday | 24 chr | length |
| lightyear | cy | 9.461E15 m | length |
| acre | acre | 4840 yd^2 | area, acre |
| hertz | Hz | 1/s | frequency |
| litre | L | 10^3/cm^3 | volume |
| newton | N | m*kg/s^2 | force |
| pound_force | lbf | 4.44822 N | force |
| dyne | dyn | 1E-5 N | force |
| pascal | Pa | N/m^2 | pressure, stress |
| bar | bar | 1E5 Pa | pressure |
| mmHg | mmHg | 1.33322E2 Pa | pressure, millimeter of mercury |
| torr | torr | 1 mmHg | pressure |
| atm | atm | 760 torr | pressure, standard atmosphere |
| joule | J | N*m | energy, work, heat |
| electronvolt | eV | 1.6021892E-19 J | energy |
| calorie | cal | 4.1868 J | energy |
| Btu | Btu | 1.05506E3 J | energy |
| watt | W | J/s | power, radiant flux |
| coulomb | C | A*s | electric charge |
| volt | V | J/C | electric potential, electromotive force |
| ohm | ohm | V/A | electric resistance, use this in /ANS |
| ohm | ohms | V/A | electric resistance |
| ohm | Ohm | V/A | electric resistance |
| ohm | Ohms | V/A | electric resistance |
| siemens | S | A/V | electric conductance |
| farad | F | C/V | electric capacitance |
| tesla | T | V s/m^2 | magnetic flux density |
| weber | Wb | V*s | magnetic flux |
| henry | H | V*s/A | inductance |
| radian | rad | m /m | plane angle |
| degree | deg | 1.745329E-2 rad | plane angle (Pi rad=180 deg) |
| steradian | sr | m^2 /m^2 | solid angle |
| lumen | lm | cd*sr | luminous flux |
| lux | lx | cd*sr/m^2 | illuminance |
| becquerel | Bq | 1/s | activity (radioactive) |
| gray | Gy | J/kg | absorbed dose (of radiation) |
| sievert | Sv | J/kg | dose equivalent (dose equivalent index) |
| Plancks Const | hbar | 1.054573E-34 J*s | angular momentum |