Units Converter
Change any value for instant conversion to other units within same group.

Length:

millimetres(mm) = inches(") = feet, / inches
metres(m) = feet(') = yards
kilometres(km) = miles(mi) = light years
microns(µm) = nanometres(nm) = Planck lengths

Area:

square cm(cm²) = square inches(inch²) = square feet(ft²)
square metres(m²) = hectares(ha) = acres
square km(km²) = square miles(mi²) = football pitches

Weight:

grammes(g) = ounces(oz) = tonnes(t)
kilogram(kg) = pounds(lb) = stone

Temperature:

Celsius(°C) = Fahrenheit(°F) = Kelvin(K)

Number Types:

decimal(n10) = hexadecimal(n16) = octal(n8)
Roman =  binary(n2)

Volume:

cubic cm(cc/ml) = cubic inches(inch³) = cubic feet(ft³)
litres(l) = pints(UK) = gallons(UK)
cubic metres(m³) = pints(US) = gallons(US)

Pressure:

millibars(mb) = inches Hg = altitude(metres)
bar = kilopascals(kPa) = psi

Angle:

degrees(°) = radians(rad) =
V
cardinal direction
revolutions = % gradient = 1 in gradient

Fuel Usage:

litres/100km = miles/gallon(UK) = miles/gallon(US)

Power:

watts(W) = kilowatts(kW) = horsepower(hp)

Energy:

kilowatt hours(kWh) = Thermal Units (BTU) = kilocalories

Speed:

metres/sec(m/s) = km/hour(kph) = miles/hour(mph)
millimetres/sec = metres/minute = % light speed(% c)

Notes:

Large/small numbers represented by powers of 10 in "e±XX" format, with exponents in multiples of 3 to match SI prefixes (kilo, mega, giga, etc.). E.g. 51.8e+06 = 51.8 x 106 = 51.8 mega.
On the right is a list of multipliers. >>>
e+03__103____kilo(k)__thousand
e+06__106____mega(M)__million
e+09__109____giga(G)__billion
e+12__1012___tera(T)__trillion
e+15__1015___peta(P)__quadrillion
e+18__1018____exa(E)__quintillion
e+21__1021__zetta(Z)__sextillion
e+24__1024__yotta(Y)__septillion
e+27__1027__ronna(R)__octillion
e+30__1030_quetta(Q)__nonillion
e-03__10-3___milli(m)__thousandth
e-06__10-6___micro(µ)__millionth
e-09__10-9____nano(n)__billionth
e-12__10-12___pico(p)__trillionth
e-15__10-15__femto(f)__quadrillionth
e-18__10-18___atto(a)__quintillionth
e-21__10-21__zepto(z)__sextillionth
e-24__10-24__yocto(y)__septillionth
e-27__10-27__ronto(r)__octillionth
e-30__10-30_quecto(q)__nonillionth
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