Unit reference

Every spelling below is checked against a real engine when this page is built, so anything listed here parses and carries the unit it names. Units are case-sensitive throughout: m is metres and M is the millions suffix, MB is megabytes and Mb is megabits.

100 cm + 2 m // 300.00 cm
5 km to miles // 3.11 miles
1 KiB in bytes // 1024.00 bytes

See units and conversions for how conversion and unit arithmetic work. This page is only the vocabulary.

The relative size column is each unit measured against the measure’s base unit, shown to six significant figures for readability. The engine itself uses the full stored value.

Angle

Measured against radian.

Unit	Spellings	Relative size
radian	`radians`, `rad`, `rads`	1
degree	`degrees`, `deg`, `degs`	0.0174533
gradian	`gradians`, `gon`, `gons`, `grad`, `grads`	0.015708
arcminute	`arcminutes`, `arcmin`, `arcmins`	0.000290888
arcsecond	`arcseconds`, `arcsec`, `arcsecs`	0.00000484814

Area

Measured against m2.

Unit	Spellings	Relative size
Pm2	`Pm2`	1e+30
Tm2	`Tm2`	1e+24
Gm2	`Gm2`	1000000000000000000
Mm2	`Mm2`	1000000000000
mi2	`mi2`	2589990
km2	`km2`	1000000
hm2	`hectare`, `hectares`, `ha`	10000
acre	`acres`, `ac`	4046.86
decare	`decares`, `daa`	1000
mu	`mu`	666.667
dam2	`dam2`	100
deciare	`deciares`, `da`	10
m2	`centiare`, `centiares`, `ca`	1
yd2	`yd2`	0.836127
ft2	`ft2`	0.092903
dm2	`dm2`	0.01
in2	`in2`	0.00064516
cm2	`cm2`	0.0001
mm2	`mm2`	0.000001
nm2	`nm2`	1e-18
pm2	`pm2`	1e-24
fm2	`fm2`	1e-30

Data

Measured against bit.

Unit	Spellings	Relative size
pebibyte	`pebibytes`, `PiB`	9007200000000000
petabyte	`petabytes`, `PB`	8000000000000000
pebibit	`pebibits`, `Pib`	1125900000000000
petabit	`petabits`, `Pb`	1000000000000000
tebibyte	`tebibytes`, `TiB`	8796093022208
terabyte	`terabytes`, `TB`	8000000000000
tebibit	`tebibits`, `Tib`	1099511627776
terabit	`terabits`, `Tb`	1000000000000
gibibyte	`gibibytes`, `GiB`	8589934592
gigabyte	`gigabytes`, `GB`	8000000000
gibibit	`gibibits`, `Gib`	1073741824
gigabit	`gigabits`, `Gb`	1000000000
mebibyte	`mebibytes`, `MiB`	8388608
megabyte	`megabytes`, `MB`	8000000
mebibit	`mebibits`, `Mib`	1048576
megabit	`megabits`, `Mb`	1000000
kibibyte	`kibibytes`, `KiB`	8192
KB	`kilobyte`, `kilobytes`, `kB`	8000
kibibit	`kibibits`, `Kib`	1024
Kb	`kilobit`, `kilobits`, `kb`	1000
hectobyte	`hectobytes`, `hB`	800
hectobit	`hectobits`, `hb`	100
decabyte	`decabytes`, `daB`	80
hextet	`hextets`	16
decabit	`decabits`, `dab`	10
byte	`bytes`, `octect`, `octects`, `B`	8
nibble	`nibbles`, `semioctet`, `semioctets`, `halfbyte`, `halfbytes`	4
bit	`bits`, `b`	1
decibyte	`decibytes`, `dB`	0.8
decibit	`decibits`, `db`	0.1
centibyte	`centibytes`, `cB`	0.08
centibit	`centibits`, `cb`	0.01
millibyte	`millibytes`, `mB`	0.008
millibit	`millibits`, `mb`	0.001
microbyte	`microbytes`	0.000008
microbit	`microbits`	0.000001
nanobyte	`nanobytes`, `nB`	8e-9
nanobit	`nanobits`, `nb`	1e-9
picobyte	`picobytes`, `pB`	8e-12
picobit	`picobits`, `pb`	1e-12
femtobyte	`femtobytes`, `fB`	8e-15
femtobit	`femtobits`, `fb`	1e-15

Energy

Measured against joule.

Unit	Spellings	Relative size
PW h	`PWh`	3600000000000000000
TW h	`TWh`	3600000000000000
petajoule	`petajoules`, `PJ`	1000000000000000
GW h	`GWh`	3600000000000
terajoule	`terajoules`, `TJ`	1000000000000
MW h	`MWh`	3600000000
gigajoule	`gigajoules`, `GJ`	1000000000
kW h	`kWh`	3600000
megajoule	`megajoules`, `MJ`	1000000
hW h	`hWh`	360000
daW h	`daWh`	36000
W h	`Wh`	3600
kilojoule	`kilojoules`, `kJ`	1000
dW h	`dWh`	360
hectojoule	`hectojoules`, `hJ`	100
cW h	`cWh`	36
decajoule	`decajoules`, `daJ`	10
mW h	`mWh`	3.6
joule	`joules`	1
decijoule	`decijoules`, `dJ`	0.1
centijoule	`centijoules`, `cJ`	0.01
millijoule	`millijoules`, `mJ`	0.001
nW h	`nWh`	0.0000036
microjoule	`microjoules`	0.000001
pW h	`pWh`	3.6e-9
nanojoule	`nanojoules`, `nJ`	1e-9
fW h	`fWh`	3.6e-12
picojoule	`picojoules`, `pJ`	1e-12
femtojoule	`femtojoules`, `fJ`	1e-15

Force

Measured against newton.

Unit	Spellings	Relative size
petanewton	`petanewtons`, `PN`	1000000000000000
teranewton	`teranewtons`, `TN`	1000000000000
giganewton	`giganewtons`, `GN`	1000000000
meganewton	`meganewtons`, `MN`	1000000
megapond	`tf`, `Mp`	9806.65
kip	`klb`, `kipf`, `klbf`	4448.22
kilonewton	`kilonewtons`, `kN`	1000
hectonewton	`hectonewtons`, `hN`	100
decanewton	`decanewtons`, `daN`	10
kilopond	`kiloponds`, `kgf`, `kp`	9.80665
lbf	`lbf`	4.44822
newton	`newtons`	1
poundal	`poundals`, `pdl`	0.138255
decinewton	`decinewtons`, `dN`	0.1
centinewton	`centinewtons`, `cN`	0.01
millinewton	`millinewtons`, `mN`	0.001
dyne	`dynes`, `dyn`	0.00001
micronewton	`micronewtons`	0.000001
nanonewton	`nanonewtons`, `nN`	1e-9
piconewton	`piconewtons`, `pN`	1e-12
femtonewton	`femtonewtons`, `fN`	1e-15

Frequency

Measured against hertz.

Unit	Spellings	Relative size
petahertz	`PHz`	1000000000000000
terahertz	`THz`	1000000000000
gigahertz	`GHz`	1000000000
megahertz	`MHz`	1000000
kilohertz	`kHz`	1000
hectohertz	`hHz`	100
decahertz	`daHz`	10
hertz	`Hz`	1
decihertz	`dHz`	0.1
centihertz	`cHz`	0.01
millihertz	`mHz`	0.001
microhertz	`microhertz`	0.000001
nanohertz	`nHz`	1e-9
picohertz	`pHz`	1e-12
femtohertz	`fHz`	1e-15

Illuminance

Measured against lux.

Unit	Spellings	Relative size
petalux	`Plx`	1000000000000000
teralux	`Tlx`	1000000000000
gigalux	`Glx`	1000000000
megalux	`Mlx`	1000000
phot	`ph`	10000
kilolux	`klx`	1000
hectolux	`hlx`	100
fc	`fc`	10.764
decalux	`dalx`	10
lux	`lx`	1
decilux	`dlx`	0.1
centilux	`clx`	0.01
millilux	`mlx`	0.001
microlux	`microlux`	0.000001
nanolux	`nlx`	1e-9
picolux	`plx`	1e-12
femtolux	`flx`	1e-15

Length

Measured against meter.

Unit	Spellings	Relative size
parsec	`parsecs`, `pc`	30856800000000000
ly	`ly`	9460730000000000
petameter	`petametre`, `petameters`, `petametres`, `Pm`	1000000000000000
terameter	`terametre`, `terameters`, `terametres`, `Tm`	1000000000000
gigameter	`gigametre`, `gigameters`, `gigametres`, `Gm`	1000000000
megameter	`megametre`, `megameters`, `megametres`, `Mm`	1000000
league	`leagues`	4828.03
NM	`nmi`	1852
mile	`miles`, `mi`	1609.34
kilometer	`kilometre`, `kilometers`, `kilometres`, `km`	1000
furlong	`furlongs`	201.168
cable	`cables`	185.2
hectometer	`hectometre`, `hectometers`, `hectometres`, `hm`	100
chain	`chains`	20.1168
decameter	`decametre`, `decameters`, `decametres`, `dam`	10
rod	`rods`	5.0292
meter	`meters`, `metre`, `metres`, `m`	1
yard	`yards`, `yd`	0.9144
foot	`feet`, `ft`	0.3048
hand	`hands`	0.1016
decimeter	`decimetre`, `decimeters`, `decimetres`, `dm`	0.1
inch	`inches`	0.0254
centimeter	`centimetre`, `centimeters`, `centimetres`, `cm`	0.01
pica	`picas`	0.0042333
millimeter	`millimetre`, `millimeters`, `millimetres`, `mm`	0.001
mil	`mils`	0.0000254
micrometer	`micrometre`, `micrometers`, `micrometres`	0.000001
nanometer	`nanometre`, `nanometers`, `nanometres`, `nm`	1e-9
picometer	`picometre`, `picometers`, `picometres`	1e-12
femtometer	`femtometre`, `femtometers`, `femtometres`, `fm`	1e-15

Luminance

Measured against cd/m2.

Unit	Spellings	Relative size
Pcd/m2	`Pcd/m2`	1000000000000000
Tcd/m2	`Tcd/m2`	1000000000000
Gcd/m2	`Gcd/m2`	1000000000
Mcd/m2	`Mcd/m2`	1000000
kcd/m2	`kcd/m2`	1000
hcd/m2	`hcd/m2`	100
dacd/m2	`dacd/m2`	10
cd/m2	`nit`, `nits`, `nt`	1
dcd/m2	`dcd/m2`	0.1
ccd/m2	`ccd/m2`	0.01
mcd/m2	`mcd/m2`	0.001
ncd/m2	`ncd/m2`	1e-9
pcd/m2	`pcd/m2`	1e-12
fcd/m2	`fcd/m2`	1e-15

Luminous intensity

Measured against candela.

Unit	Spellings	Relative size
petacandela	`Pcd`	1000000000000000
teracandela	`Tcd`	1000000000000
gigacandela	`Gcd`	1000000000
megacandela	`Mcd`	1000000
kilocandela	`kcd`	1000
hectocandela	`hcd`	100
decacandela	`dacd`	10
candela	`cd`, `candlepower`, `cp`, `CP`	1
hefnerkerze	`HK`	0.92
decicandela	`dcd`	0.1
centicandela	`ccd`	0.01
millicandela	`mcd`	0.001
microcandela	`microcandela`	0.000001
nanocandela	`ncd`	1e-9
picocandela	`pcd`	1e-12
femtocandela	`fcd`	1e-15

Mass

Measured against gram.

Unit	Spellings	Relative size
petagram	`petagrams`, `Pg`, `gigatonne`, `gigatonnes`, `Gt`	1000000000000000
teragram	`teragrams`, `Tg`, `megatonne`, `megatonnes`, `Mt`	1000000000000
gigagram	`gigagrams`, `Gg`, `kilotonne`, `kilotonnes`, `kt`	1000000000
megagram	`megagrams`, `Mg`, `tonne`, `tonnes`, `t`	1000000
centner	`centners`	100000
cwt	`cwt`	50800
cental	`cental`	45360
stone	`stones`, `st`	6350.29
kilogram	`kilograms`, `kg`	1000
pound	`pounds`, `lb`, `lbs`	453.592
hectogram	`hectograms`, `hg`	100
oz t	`toz`	31.1035
ounce	`ounces`, `oz`	28.3495
decagram	`decagrams`, `dag`	10
gram	`grams`, `g`	1
carat	`carats`	0.2
decigram	`decigrams`, `dg`	0.1
grain	`grains`, `gr`	0.0647989
centigram	`centigrams`, `cg`	0.01
milligram	`milligrams`, `mg`	0.001
microgram	`micrograms`, `mcg`	0.000001
nanogram	`nanograms`, `ng`	1e-9
picogram	`picograms`, `pg`	1e-12
femtogram	`femtograms`, `fg`	1e-15

Power

Measured against watt.

Unit	Spellings	Relative size
petawatt	`petawatts`, `PW`	1000000000000000
terawatt	`terawatts`, `TW`	1000000000000
gigawatt	`gigawatts`, `GW`	1000000000
megawatt	`megawatts`, `MW`	1000000
kilowatt	`kilowatts`, `kW`	1000
horsepower	`hp`	745.7
hectowatt	`hectowatts`, `hW`	100
decawatt	`decawatts`, `daW`	10
watt	`watts`, `W`	1
deciwatt	`deciwatts`, `dW`	0.1
centiwatt	`centiwatts`, `cW`	0.01
milliwatt	`milliwatts`, `mW`	0.001
microwatt	`microwatts`	0.000001
nanowatt	`nanowatts`, `nW`	1e-9
picowatt	`picowatts`, `pW`	1e-12
femtowatt	`femtowatts`, `fW`	1e-15

Pressure

Measured against pascal.

Unit	Spellings	Relative size
petabar	`petabars`, `Pbar`	100000000000000000000
terabar	`terabars`, `Tbar`	100000000000000000
petapascal	`petapascals`, `PPa`	1000000000000000
gigabar	`gigabars`, `Gbar`	100000000000000
terapascal	`terapascals`, `TPa`	1000000000000
megabar	`megabars`, `Mbar`	100000000000
gigapascal	`gigapascals`, `GPa`	1000000000
kilobar	`kilobars`, `kbar`	100000000
hectobar	`hectobars`, `hbar`	10000000
megapascal	`megapascals`, `MPa`, `decabar`, `decabars`, `dabar`	1000000
atmosphere	`atmospheres`, `atm`	101325
bar	`bars`	100000
decibar	`decibars`, `dbar`	10000
psi	`lbf/in2`	6894.76
inHg	`Hg`	3386.39
kilopascal	`kilopascals`, `kPa`, `centibar`, `centibars`, `cbar`	1000
inAq	`Aq`	249.089
torr	`torrs`, `Torr`	133.322
hectopascal	`hectopascals`, `hPa`, `millibar`, `millibars`, `mbar`	100
decapascal	`decapascals`, `daPa`	10
pascal	`pascals`, `Pa`	1
millitorr	`mTorr`	0.133322
decipascal	`decipascals`, `dPa`, `microbar`, `microbars`	0.1
centipascal	`centipascals`, `cPa`	0.01
millipascal	`millipascals`, `mPa`	0.001
nanobar	`nanobars`, `nbar`	0.0001
micropascal	`micropascals`	0.000001
picobar	`picobars`, `pbar`	1e-7
nanopascal	`nanopascals`, `nPa`	1e-9
femtobar	`femtobars`, `fbar`	1e-10
picopascal	`picopascals`, `pPa`	1e-12
femtopascal	`femtopascals`, `fPa`	1e-15

Temperature

Measured against kelvin.

Unit	Spellings	Relative size
petakelvin	`petakelvins`, `PK`	1000000000000000
terakelvin	`terakelvins`, `TK`	1000000000000
gigakelvin	`gigakelvins`, `GK`	1000000000
megakelvin	`megakelvins`, `MK`	1000000
kilokelvin	`kilokelvins`, `kK`	1000
hectokelvin	`hectokelvins`, `hK`	100
decakelvin	`decakelvins`, `daK`	10
kelvin	`kelvins`, `K`	1
celsius	`C`	1
rankine	`rankine`	0.555556
fahrenheit	`F`	0.555556
decikelvin	`decikelvins`, `dK`	0.1
centikelvin	`centikelvins`, `cK`	0.01
millikelvin	`millikelvins`, `mK`	0.001
microkelvin	`microkelvins`	0.000001
nanokelvin	`nanokelvins`, `nK`	1e-9
picokelvin	`picokelvins`, `pK`	1e-12
femtokelvin	`femtokelvins`, `fK`	1e-15

Some of these share a degree size but not a zero point, which the column above cannot show. Celsius and kelvin step alike and start 273.15 apart, and Fahrenheit and Rankine do the same.

Time

Measured against second.

Unit	Spellings	Relative size
petasecond	`petaseconds`, `Ps`	1000000000000000
terasecond	`teraseconds`, `Ts`	1000000000000
millennium	`millennia`	31536000000
century	`centuries`	3153600000
gigasecond	`gigaseconds`, `Gs`	1000000000
decade	`decades`	315360000
year	`years`, `yr`	31536000
month	`months`, `mo`	2592000
fortnight	`fortnights`, `fn`	1209600
megasecond	`megaseconds`, `Ms`	1000000
week	`weeks`, `wk`	604800
day	`days`, `d`	86400
hour	`hours`, `h`	3600
kilosecond	`kiloseconds`, `ks`	1000
hectosecond	`hectoseconds`, `hs`	100
milliday	`millidays`, `md`	86.4
minute	`minutes`, `min`	60
decasecond	`decaseconds`, `das`	10
second	`seconds`, `s`	1
decisecond	`deciseconds`, `ds`	0.1
centisecond	`centiseconds`, `cs`	0.01
TU	`TU`	0.001024
millisecond	`milliseconds`, `ms`	0.001
microsecond	`microseconds`	0.000001
nanosecond	`nanoseconds`, `ns`	1e-9
picosecond	`picoseconds`, `ps`	1e-12
svedberg	`svedbergs`	1e-13
femtosecond	`femtoseconds`, `fs`	1e-15

Volume

Measured against stere.

Unit	Spellings	Relative size
Pm3	`Pm3`	1e+45
Tm3	`Tm3`	1e+36
Gm3	`Gm3`	1e+27
Mm3	`Mm3`	1000000000000000000
petaliter	`petaliters`, `petalitre`, `petalitres`, `Pl`, `PL`	1000000000000
mi3	`mi3`	4168180000
km3	`teraliter`, `teraliters`, `teralitre`, `teralitres`, `Tl`, `TL`	1000000000
hm3	`gigaliter`, `gigaliters`, `gigalitre`, `gigalitres`, `Gl`, `GL`	1000000
ac ft	`ac ft`	1233.48
dam3	`megaliter`, `megaliters`, `megalitre`, `megalitres`, `Ml`, `ML`	1000
MTON	`MTON`	1.133
stere	`steres`, `m3`, `kiloliter`, `kiloliters`, `kilolitre`, `kilolitres`, `kl`, `kL`	1
yd3	`yd3`	0.764555
hectoliter	`hectoliters`, `hectolitre`, `hectolitres`, `hl`, `hL`	0.1
ft3	`ft3`	0.0283168
decaliter	`decaliters`, `decalitre`, `decalitres`, `dal`, `daL`	0.01
pk	`pk`	0.00909218
gallon	`gallons`, `gal`	0.00378541
dm3	`liter`, `liters`, `litre`, `litres`, `l`	0.001
quart	`quarts`, `qt`	0.000946353
pint	`pints`, `pt`	0.000473176
cup	`cups`	0.000236588
deciliter	`deciliters`, `decilitre`, `decilitres`, `dl`, `dL`	0.0001
fl oz	`fl oz`	0.0000295735
in3	`in3`	0.0000163871
tablespoon	`tablespoons`, `tbsp`	0.0000147868
centiliter	`centiliters`, `centilitre`, `centilitres`, `cl`, `cL`	0.00001
teaspoon	`teaspoons`, `tsp`	0.00000492892
cm3	`milliliter`, `milliliters`, `millilitre`, `millilitres`, `ml`, `mL`	0.000001
mm3	`microliter`, `microliters`, `microlitre`, `microlitres`	1e-9
nanoliter	`nanoliters`, `nanolitre`, `nanolitres`, `nl`, `nL`	1e-12
picoliter	`picoliters`, `picolitre`, `picolitres`, `pl`, `pL`	1e-15
femtoliter	`femtoliters`, `femtolitre`, `femtolitres`, `fl`, `fL`	1e-18
nm3	`nm3`	1e-27
pm3	`pm3`	1e-36
fm3	`fm3`	1e-45

Speed

Measured against mps.

Unit	Spellings	Relative size
mps	`mps`	1
kn	`kn`	0.514444
mph	`mph`	0.44704
ft_s	`ft_s`	0.3048
kph	`kph`	0.277778

Pace

Unit	Spellings	Relative size
min_km	`min_km`	0.06
min_mi	`min_mi`	0.0372823

Voltage

Unit	Spellings	Relative size
kV	`kV`	1000
mV	`mV`	0.001

Current

Measured against A.

Unit	Spellings	Relative size
kA	`kA`	1000
A	`A`	1
mA	`mA`	0.001

Apparent power

Measured against VA.

Unit	Spellings	Relative size
MVA	`MVA`	1000000
kVA	`kVA`	1000
VA	`VA`	1

Reactive power

Unit	Spellings	Relative size
Mvar	`Mvar`	1000000
kvar	`kvar`	1000

Reactive energy

Measured against varh.

Unit	Spellings	Relative size
Mvarh	`Mvarh`	1000000
kvarh	`kvarh`	1000
varh	`varh`	1

Volume flow rate

Measured against m3s.

Unit	Spellings	Relative size
m3s	`m3s`	1
cfs	`cfs`	0.0283168
lps	`lps`	0.001
m3h	`m3h`	0.000277778
gpm	`gpm`	0.0000630902
lpm	`lpm`	0.0000166667

Parts per

Unit	Spellings	Relative size
permille	`permille`	0.001
ppm	`ppm`	0.000001
ppb	`ppb`	1e-9
ppt	`ppt`	1e-12

Spellings that are not listed

The conversion tables carry 1504 spellings in total, and 459 of them are missing above. Most are multi-word forms like sq ft and cu yd, which the tables can resolve but the lexer cannot tokenize, so they are unavailable when typing an expression. They are excluded here rather than listed and quietly broken.