| Table 1 Base Unit |
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| 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 |
| Table 2 Prefix |
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| Prefix | symbol | factor |
| yotta | Y | 1024 |
| zetta | Z | 1021 |
| exa | E | 1018 |
| peta | P | 1015 |
| tera | T | 1012 |
| giga | G | 109 |
| mega | M | 106 |
| kilo | k | 103 |
| hecto | h | 102 |
| 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 |
| Table 3 Derived Unit |
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| name | symbol | unit | comment |
| gram | g | 0.001 kg | mass |
| hour | hr | 3600. s | time |
| minute | min | 60 s | time |
| year | yr | 3.15E7 s | 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 |
| 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 |
| atmosphere | 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 |
| 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) |
| curie | Ci | 3.70E10 Bq | activity (in Curie) |
| gray | Gy | J/kg | absorbed dose (of radiation) |
| sievert | Sv | J/kg | dose equivalent (dose equivalent index) |
| barn | barn | 1E-28 m^2 | scattering cross-sectional area |
| astroUnit | AU | 1.49598E11 m | mean distance earth to sun |
| celsius | degC | 1 K | multiplicatively OK, only for delta temperatures |
| farenheit | degF | 0.5555555555 K | multiplicatively OK, only for delta temperatures |