Base Units
Length
- meter (m)
- inch (in)
- foot (ft)
- yard (yd)
- mile (mi)
- link (li)
- rod (rd)
- chain (ch)
- angstrom
- mil
Surface Area
- m²
- sqin
- sqft
- sqyd
- sqmi
- sqrd
- sqch
- sqmil
- acre
- hectare
Volume
- m³
- litre (l, L, lt, liter)
- cc
- cuin
- cuft
- cuyd
- teaspoon
- tablespoon
Liquid Volume
- minim
- fluiddram (fldr)
- fluidounce (floz)
- gill (gi)
- cup (cp)
- pint (pt)
- quart (qt)
- gallon (gal)
- beerbarrel (bbl)
- oilbarrel (obl)
- hogshead
- drop (gtt)
Angles
- radian (rad)
- degree (deg)
- gradian (grad)
- cycle
- arcsecond (arcsec)
- arcminute (arcmin)
Time
- second (s, secs, seconds)
- minute (min, mins, minutes)
- hour (h, hr, hrs, hours)
- day (days)
- week (weeks)
- month (months)
- year (years)
- decade (decades)
- century (centuries)
- millennium (millennia)
Frequency
- hertz (Hz)
Mass
- gram (g)
- tonne
- ton
- grain (gr)
- dram (dr)
- ounce (oz)
- poundmass (lbm, lb, lbs)
- hundredweight (cwt)
- stick
- stone
Electric Current
- ampere (A)
Temperature
- kelvin (K)
- celsius (degC)
- fahrenheit (degF)
- rankine (degR)
Amount of Substance
- mole (mol)
Luminous Intensity
- candela (cd)
Force
- newton (N)
- dyne (dyn)
- poundforce (lbf)
- kip
Energy
- joule (J)
- erg
- Wh
- BTU
- electronvolt (eV)
Power
- watt (W)
- hp
Pressure
- pascal (Pa)
- psi
- atm
- torr
- bar
Electricity and Magnetism
- ampere (A)
- coulomb (C)
- watt (W)
- volt (V)
- ohm
- farad (F)
- weber (Wb)
- tesla (T)
- henry (H)
- siemens (S)
- electronvolt (eV)
Binary
- bits (b)
- bytes (B)
All time units are based on the Julian year, with one month being 1/12th of a Julian year, a year being one Julian year, a decade being 10 Julian years, a century being 100, and a millennium being 1000.
Prefixes
Decimal Prefixes
Binary Prefixes
Physical Constants
Universal Constants
Electromagnetic Constants
Atomic and Nuclear Constants
Physico-Chemical Constants
Adopted Values
Natural Units
The values of loschmidt and molar volume are at T = 273.15 K and p = 101.325 kPa. The value of sackur tetrode is at T = 1 K and p = 101.325 kPa.