Units

Fathom Reference > Fathom Operators, Functions, and Units > Units

Below are the dimensions in which Fathom’s units live. All the units in a given dimension are compatible, and Fathom can convert between them (except for the Important Constants). Some conversions are given. Each unit lists the short form, the long form singular, the long form plural, and then other allowed forms. You can combine units in any way you want.

Unit Dimensions

Length

m, meter, meters

cm, centimeter, centimeters

1 cm = 0.01 m

mm, millimeter, millimeters

1 mm = 0.001 m

km, kilometer, kilometers, click, clicks

1 km = 1000 m

nm, nanometer, nanometers

1 nm = 1 x 10^-09 m

N.M., nautical mile, nautical miles, nauticalmile, nauticalmiles, NM

1 N.M. = 1852 m

AU, astronomical unit, astronomical units, au

1 AU = 149,597,870,691 m

pc, parsec, parsecs

1 pc = 206,265 m (approximately)

ly, light year, light years

1 ly = 3.08568 x 10^+16 m (approximately)

R_Earth, Earth radius, Earth radii, RE

1 R_Earth = 6371.01 km

in, inch, inches

1 in = 2.54 cm

ft, foot, feet

1 ft = 12 in

yd, yard, yards, pace, paces

1 yd = 3 ft

mi, mile, miles, statute mile, statute miles

1 mi = 1760 yd

furlong, furlongs

1 furlong = 1/8 mi

fm, fathom, fathoms

1 fm = 6 ft

Angstrom

1 Angstrom = 0.1 mm

Area

ha, hectare, hectares

1 ha = 10000 m^2

acre, acres, ac

1 acre = 1/640 mi^2

barn, barns

1 barn = 1 x 10^-24 cm^2

Volume

L, liter, liters

1 L = 1000 cm^3

dL, deciLiter, deciLiters,

 1 dL = 0.1L        

mL, milliliter, milliliters

1 mL = 0.001 L

cc, cubic centimeter, cubic centimeters

1 cc = 1 mL

gal, gallon, gallons

1 gal = 231 in^3

qt, quart, quarts

1 qt = 1/4 gal

pt, pint, pints

1 pt = 1/2 qt

flOz, fluid ounce, fluid ounces, floz

1 flOz = 1/16 pt

Mass

g, gram, grams

kg, kilogram, kilograms, kilo, kilos

1 g = 0.001 kg

mg, milligram, milligrams

1 mg = 0.001 g

MT, Metric Ton, Metric Tons

1 MT = 1000 kg

M_Earth, Earth mass, Earth masses, earth mass, earth masses, earthmass, earthmasses

1 M_Earth = 5.9742 x 10^24 kg

M_Sun, Solar mass, Solar masses, solar mass, solar masses, sunmass, sunmasses

1 M_Sun = 1.9891 x 10^30 kg

amu, atomic mass unit, atomic mass units

1 amu = 1.66053873 x 10^–27 kg

1 flOz = 1/16 pt

Amount

mole, Mole

 1 mole = 6.023 x 10^23

Time

s, second, seconds, sec, secs

ns, nanosecond, nanoseconds

 1ns = 0.00000000001s

µs, microsecond, microseconds,

 1 µs = 0.0000001s

ms, millisecond, milliseconds

1 ms = 0.001 s

min, minute, minutes, mins

1 min = 60 s

hr, hour, hours, h

1 hr = 60 min

d, day, days

1 d = 24 hr

wk, week, weeks

1 wk = 7 d

fortnight, fortnights

1 fortnight = 14 days

yr, year, years, (Julian) year, (Julian) years, y, yrs

1 y = 365.25 days

sY, (sidereal) year, (sidereal) years

1 sY = 365.256360417 days

Speed

c, light, light, lightspeed

1 c = 2.99792458 x 10^8 m/s

mach

1 mach = 331.46 m/s

mph, mile per hour, miles per hour

1 mph = 1 mi/hr

kph, kilometer per hour, kilometers per hour

1 kph = 1 km/hr

kt, knot, knots

1 kt = 1 N.M./hr

Acceleration

gravity, gravities

1 gravity = 9.80665 m/s^2

Frequency

Hz, Hertz, hz

1 Hz = 1 s^-1

MHz, megaHertz, megahertz

1 MHz = 1,000,000 Hz

kHz, kiloHertz, kilohertz

1 kHz = 1000 Hz

Force

N, Newton, Newtons, newton, newtons

1 N = 1 kg m/s^2

dy, dyne, dynes

1 dy = 0.00001 N

kgf, kg of force, kg of force

1 kgf = 1 kg gravity

sthene

1 sthene = 1000 N

lb, pound, pounds, lbs

1 lb = 4.448222 N

oz, ounce, ounces

1 oz = 1/16 lb

Density

H2O, water

1 H2O = 1 gravity g/cm^3

Hg, Mercury

1 Hg = 13.5951 H2O

Pressure

Pa, Pascal, Pascals, pascal, pascals

1 Pa = 1 N/m^2

kPa, kilopascal, kilopascals,

1 kPa = 1000 Pa

atm, atmosphere, atmospheres

1 atm = 101325 Pa

Work

J, Joule, Joules, joule, joules

1 J = 1 kg m^2/s^2

erg, ergs

1 erg = 1 x 10^-7 J

BTU, BTUs

1 BTU = 1/1055.056 J

kWh, kilowatt-hour, kilowatt-hours

1 kWh = 1000 W hr

eV, electron Volt, electron Volts

1 eV = 1 electron V

Power/Energy

W, Watt, Watts, watt, watts

1 W = 1 kg m/s^3

hp, horsepower

1 hp = 550 ft lb/s

cal, cals, calorie, calories

 1 cal = 4.185 J

kcal, kcals, kilocalorie, kilocalories

 1kcal = 1000 cal

Charge

C, Coulomb, Coulombs, coulomb, coulombs

1 C = 1 A s

electron, electron charge, electron charges

1 electron = 1.602176462 x 10^-19 C

Electrical Potential

V, Volt, Volts, volt, volts

1 V = 1 W/A

Resistance

Ohm, Ohms, ohm, ohms

1 Ohm = 1 V/A

Current

A, Ampere, Amperes, ampere, amperes, amp amps

1 A = 1 coulomb

mA, milliAmpere, milliAmperes, milliamp, milliamps

1 A = 0.001 mA

Conductance

S, siemens, mho

1 siemens = 1 Amp/Volt

Capacitance

F, farad, farads

1 farad = 1 coulomb/volt

uF, microfarad, microfarads

1 uF = 1,000,000 F

Magnetic Flux

Wb, weber, webers

1 weber = 1 volt second

Inductance

H, henry

1 henry = 1 weber/amp

Magnetic Flux Density

T, tesla, teslas

1 tesla = 1 weber/m2

gauss

1 gauss = 10-4 tesla

Angle

deg, degree, degrees

rad, radian, radians

1 rad = 57.295779513 degrees

sr, steradian, steradians

1 sr = 3282.806 degrees

arcmin, arcminute, arcminutes

1 arcmin = 1/60 deg

arcsec, arcsecond, arcseconds

1 arcsec = 1/60 arcminutes

rev, revs, revolution, revolutions

1 rev = 360 degrees

Data

B, byte, bytes

kB, kilobyte, kilobytes

1 kB = 1024 B

MB, megabyte, megabytes

1 MB = 1024 kB

GB, gigabyte, gigabytes

1 GB = 1024 MB

TB, terabyte, terabytes

1 TB = 1024 GB

bit, bit, bits

1 bit = 1/8 B

Important Constants

Planck’s constant, Planck’s constants

1 h = 6.62606876 x 10^-34 J s

G, Big G

1 G = 6.673 x 10^-11 N m^2/kg^2

Avogadro’s Number

1 mole = 6.023 x 10^23