The Unit column of the following tables display all of the units that are recognized by the system. You can use either the units themselves, or combinations of these units, for example kJ/mol, kg*m^2, or m/s/s. The system accepts equivalent answers with different units as long as both units are accepted in the system. That is, if the answer is 120 cm, then 1.2 m or 1200 mm will also be accepted as correct.
SI/Metric Units (Accept Prefixes)
The units in this section can each be prefixed with one of the accepted SI prefixes below.
SI Prefixes
| Prefix | Factor | Name |
|---|
| Y | 10^24 | yotta |
| Z | 10^21 | zetta |
| E | 10^18 | exa |
| P | 10^15 | peta |
| T | 10^12 | tera |
| G | 10^9 | giga |
| M | 10^6 | mega |
| k | 10^3 | kilo |
| h | 10^2 | hecto |
| da | 10^1 | deca |
| d | 10^-1 | deci |
| c | 10^-2 | centi |
| m | 10^-3 | milli |
| u | 10^-6 | micro |
| n | 10^-9 | nano |
| p | 10^-12 | pico |
| f | 10^-15 | femto |
| a | 10^-18 | atto |
| z | 10^-21 | zepto |
| y | 10^-24 | yocto |
CGS Units
| Unit | Definition | Name |
|---|
| erg | 10^-7 J | erg |
| dyn | 10^-5 N | dyne |
| P | 0.1 Pa*s | poise |
| St | cm^2/s | stokes |
| sb | cd/cm^2 | stilb |
| ph | 10^4 lx | phot |
| Gal | cm/s^2 | gal |
| Mx | 10^-8 Wb | maxwell |
| G | 10^-4 T | gauss |
| Oe | (10^3/4/Pi) A/m | oersted (rationalized) |
Base Units
| Unit | Definition | Name |
|---|
| m | | meter |
| s | | second |
| kg | | kilogram |
| A | | amp |
| K | | kelvin |
Derived SI Units
| Unit | Definition | Name |
|---|
| mol | 6.02214199 * 10^23 | mole |
| rad | 1 | radian |
| sr | 1 | steradian |
| Hz | 1/s | hertz |
| N | kg m/s^2 | newton |
| Pa | N/m^2 | pascal |
| J | N m | joule |
| W | J/s | watt |
| C | A s | coulomb |
| V | J/C | volt |
| F | C/V | farad |
| ohm | V/A | ohm |
| S | A/V | siemens |
| Wb | V s | weber |
| T | Wb/m^2 | tesla |
| H | Wb/A | henry |
| lm | cd sr | lumen |
| lx | lm/m^2 | lux |
| Bq | s^-1 | becquerel |
| Gy | J/kg | gray |
| Sv | J/kg | sievert |
| kat | mol/s | katal |
Metric Units
| Unit | Definition | Name |
|---|
| L | m^3/1000 | liter |
| M | mol/L | molar |
| eV | J*1.602E-19 | electron volt |
SI/Metric Units (No Prefixes)
These units, and alternative ways of writing units, do not accept SI prefixes.
Long-form Names of SI Units
| Unit | Definition | Name |
|---|
| meter | m | meter |
| metre | m | meter |
| meters | m | meter |
| centimeter | cm | centimeter |
| centimeters | cm | centimeter |
| radian | rad | radian |
| radians | rad | radian |
| steradian | sr | steradian |
| steradians | sr | steradian |
| sec | s | second |
| second | s | second |
| seconds | s | second |
| mole | mol | mole |
| moles | mol | mole |
| ohms | ohm | ohm |
Metric Units and Long-form Names
| Unit | Definition | Name |
|---|
| min | 60s | minute |
| minute | min | minute |
| minutes | min | minute |
| h | 60min | hour |
| hr | h | hour |
| hour | h | hour |
| hours | h | hour |
| d | 24h | day |
| day | d | day |
| days | d | day |
| deg | Pi/180 | degree |
| degree | deg | degree |
| degrees | deg | degree |
| arcdegree | deg | degree |
| arcdeg | deg | degree |
| arcminute | deg/60 | arcminute |
| arcmin | arcminute | arcminute |
| arcsecond | arcminute/60 | arcsecond |
| arcsec | arcsecond | arcsecond |
| ha | 10^4 m^2 | hectare |
| hectare | ha | hectare |
| liter | L | liter |
| liters | L | liter |
| t | 10^3kg | tonne (metric) |
| tonne | t | tonne (metric) |
| tonnes | t | tonne (metric) |
| Molar | M | molar |
| bar | 100 kPa | bar |
| mbar | bar*10^-3 | millibar |
| cbar | bar*10^-2 | centibar |
| dbar | bar*10^-1 | decibar |
| kbar | bar*10^3 | kilobar |
| Mbar | bar*10^6 | megabar |
| mmHg | 133.322 Pa | millimeter of mercury |
| b | 100 fm^2 | barn |
| kn | (1852/3600) m/s | knot |
| degC | (T + 273.15) K | degree Celsius |
U.S. Customary/Imperial Units
The units in this section cover commonly used units from the U.S. Customary System and the Imperial System.
| Unit | Definition | Name |
|---|
| in | (1/12)ft | inch |
| inch | in | inch |
| inches | in | inch |
| ft | m*0.3048 | foot |
| foot | ft | foot |
| feet | ft | foot |
| yd | 3feet | yard |
| yard | yd | yard |
| yards | yd | yard |
| mi | 5280 feet | miles (statute) |
| mile | mi | miles (statute) |
| miles | mi | miles (statute) |
| li | (33/50)sft | link |
| sft | (1200/3937)m | foot (survey) |
| rd | 25 li | rod |
| ch | 4 rd | chain |
| fur | 10 ch | furlong |
| lea | 3 mi | league |
| ftm | 2 yd | fathom |
| cb | 120 ftm | cable |
| nmi | 1.852 km | mile (nautical) |
| NM | 1.852 km | mile (nautical) |
| sqft | 144 in^2 | square foot (survey) |
| sqch | 4356 sqft | square chain |
| acre | 43560 sqft | acre |
| acres | acre | acre |
| section | 640 acre | section |
| sections | section | section |
| twp | 36 sections | survey township |
| cuin | in^3 | cubic inch |
| cuft | 1728 cuin | cubic foot |
| cuyd | 27 cuft | cubic yard |
| acreft | 45360 cuft | acre-foot |
| floz | 29.5735295625 mL | fluid ounces (US) |
| cp | 8 floz | cup (US fluid) |
| pt | 2 cp | pint (US fluid) |
| qt | 2 pt | quart (US fluid) |
| gal | 4 qt | gallon (US fluid) |
| Unit | Definition | Name |
|---|
| flozI | 28.4130625 mL | fluid ounces (Imperial) |
| giI | 5 flozI | gill (Imperial) |
| ptI | 20 flozI | pint (Imperial) |
| qtI | 2 ptI | quart (Imperial) |
| galI | 4 qtI | gallon (Imperial) |
| oz | (1/16)lb | ounces (Avoirdupois) |
| lb | 453.59237 g | pounds (Avoirdupois) |
| lbs | lb | pounds (Avoirdupois) |
| ton | 2000 lb | ton (Avoirdupois) |
| degF | (5/9)(T - 32) + 273.15 K | degree Fahrenheit |