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Detailed list of metric system
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Detailed list of metric system
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| Quantity | Unit | Symbol |
|---|---|---|
| length | meter | m |
| mass | kilogram | kg |
| time | second | s |
| electric current | ampere | A |
| thermodynamic temperature | kelvin | K |
| amount of substance | mole | mol |
| luminous intensity | candela | cd |
| Prefix | Symbol | Multiplication factor | |
|---|---|---|---|
| yotta | Y | ||
| zetta | Z | ||
| exa | E | ||
| peta | P | ||
| tera | T | ||
| giga | G | ||
| mega | M | 1 000 000 | |
| kilo | k | 1000 | |
| hecto | h | 100 | |
| deka | da | 10 | |
| deci | d | 0.1 | |
| centi | c | ||
| milli | m | ||
| micro | µ | ||
| nano | n | ||
| pico | p | ||
| femto | f | ||
| atto | a | ||
| zepto | z | ||
| yocto | y | ||
| Quantity | Name | Symbol | Expression in terms of other SI units |
|---|---|---|---|
| angle, plane | radian* | rad | m/m = 1 |
| angle, solid | steradian* | sr | m2/m2 = 1 |
| Celsius temperature | degree Celsius | °C | K |
| electric capacitance | farad | F | C/V |
| electric charge, quantity of electricity | coulomb | C | A·s |
| electric conductance | siemens | S | A/V |
| electric inductance | henry | H | Wb/A |
| electric potential difference, electromotive force | volt | V | W/A |
| electric resistance | ohm | ![[Omega]](images/Omega.gif){kind=small} | V/A |
| energy, work, quantity of heat | joule | J | N·m |
| force | newton | N | kg·m/s2 |
| frequency (of a periodic phenomenon) | hertz | Hz | 1/s |
| illuminance | lux | lx | lm/m2 |
| luminous flux | lumen | lm | cd·sr |
| magnetic flux | weber | Wb | V·s |
| magnetic flux density | tesla | T | Wb/m2 |
| power, radiant flux | watt | W | J/s |
| pressure, stress | pascal | Pa | N/m2 |
| activity (referred to a radionuclide) | becquerel | Bq | 1/s |
| absorbed dose, specific energy imparted, kerma | gray | Gy | J/kg |
| dose equivalent, ambient dose equivalent, directional dose equivalent, personal dose equivalent, organ dose equivalent | sievert | Sv | J/kg |
| catalytic activity | katal | kat | mol/s |
* The radian and steradian, previously classified as supplementary units, are dimensionless derived units that may be used or omitted in expressing the values of physical quantities.
| Quantity | Unit | Symbol | Value in SI units |
|---|---|---|---|
| time | minute | min | 1 min = 60 s |
| hour | h | 1 h = 60 min = 3600 s | |
| day | d | 1 d = 24 h = 86 400 s | |
| week, month, etc. | |||
| plane angle | degree* | ° | 1° = (pi/180) rad |
| minute* | ' | 1' = (1/60)° = pi/10 800) rad | |
| second* | " | 1" = (1/60)' = (pi/648 000) rad | |
| revolution, turn | r | 1 r = 2 pi rad | |
| area | hectare | ha | 1 ha = 1 hm2 = 104 m2 |
| volume | liter** | L, l | 1 L = 1 dm3 = 10-3 m3 |
| mass | metric ton or tonne*** | t | 1 t = 103 kg |
* Decimal degrees should be used for division of degrees, except for fields such as astronomy and cartography.
** The symbol L is preferred for use in the U.S.
*** The terms "metric ton" or "tonne" are restricted to commercial usage.
| Name | Symbol | Value in SI Units |
|---|---|---|
| nautical mile | 1 nautical mile = 1852 m | |
| knot | 1 nautical mile per hour = (1852/3600) m/s | |
| bar* | bar | 1 bar = 100 kPa |
| barn | b | 1 b = 100 fm2 = 10-28 m2 |
| curie | Ci | 1 Ci = 3.7 x 1010 Bq |
| roentgen | R | 1 R = 2.58 x 10-4 C/kg |
| rad | rad, rd** | 1 rad = 10 mGy = 10-2 Gy |
| rem | rem | 1 rem = 10 mSv = 10-2 Sv |
* Use is limited to meteorology.
** When there is risk of confusion with the symbol for radian, rd may be used as the symbol for rad.
The above information has been extracted from IEEE/ASTM's Standard for Use of the International System of Units (SI): The Modern Metric System.
Note: To print a letter-size copy, download this PDF version of the SI unit diagram shown below.
Or, a PDF of a more complete version of the SI unit diagram is also available.
Note: To print a letter-size copy, download this PDF version of the SI unit diagram shown below.
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