Unit Converter
Convert common units like length, volume and temperature. All local.
Length
km, m, cm, mm, µm, inch, foot, yard, mile, nautical mile, fathom, furlong, li, zhang, chi, cun, fen, li
Volume
liter, milliliter, cubic meter, US gallon/quart/pint
Temperature
Celsius, Fahrenheit, Kelvin
Weight
tonne, kilogram, gram, milligram, jin, pound, ounce, stone, US ton, long ton
Speed
m/s, km/h, mph, knot, ft/s
Area
m², km², hectare, mi², acre, yd², ft², in²
Power
W, kW, MW, HP, PS, kcal/s, Btu/s, ft·lb/s
Pressure
Pa, kPa, hPa, mbar, bar, atm, mmHg, psi
Usage & Common Formulas
Quick reference of common definitions and conversions.
SI base unit is meter (m). Examples: 1 km = 1000 m; 1 m = 10 dm = 100 cm = 1000 mm; 1 inch = 25.4 mm; 1 nautical mile = 1852 m. Chinese system: 1 zhang = 10 chi, 1 chi = 10 cun, 1 cun = 10 fen, 1 fen = 10 li.
speed = distance / time. 1 m/s = 3.6 km/h ≈ 2.23694 mph ≈ 1.94384 kn.
Standard atmosphere: 1 atm = 101325 Pa ≈ 760 mmHg ≈ 1.01325 bar ≈ 14.6959 psi.