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Convert between 80+ units across 12 measurement categories with high-precision, SI-based calculations.
12 categories, 80+ units. High-precision SI-based conversions with live results.
Common Conversions
Linear distance from nanometers to miles
nm, μm, mm, cm, m, km, in, ft, yd, mi, nmi
11 units
Weight and mass from milligrams to tons
mg, g, kg, t, oz, lb, st, ton
8 units
Temperature scales including Rankine
°C, °F, K, °R
4 units
Liquid and solid volumes
mL, L, m³, fl oz, cup, pt, qt, gal, Imp gal
9 units
Surface area from mm² to square miles
mm², cm², m², km², in², ft², yd², mi², ac, ha
10 units
Velocity from m/s to Mach
m/s, km/h, mph, kn, ft/s, Mach
6 units
Duration from milliseconds to years
ms, s, min, h, d, wk, mo, yr
8 units
Digital storage: SI and IEC (binary) prefixes
b, B, KB, MB, GB, TB, PB, KiB, MiB, GiB
10 units
Fluid and atmospheric pressure
Pa, kPa, MPa, bar, mbar, atm, psi, mmHg
8 units
Work, heat, and electrical energy
J, kJ, cal, kcal, Wh, kWh, eV, BTU, ft·lbf
9 units
Mechanical force in SI and imperial
N, kN, dyn, lbf, kgf, ozf
6 units
Angular measurement in all common systems
°, rad, grad, arcmin, arcsec, rev
6 units
Length: 1 kilometer = 0.621 371 miles = 3 280.84 feet
Length: 1 inch = 2.54 cm (exact)
Mass: 1 kilogram = 2.204 62 pounds
Mass: 1 stone = 14 pounds = 6.350 29 kg
Temperature: 0 °C = 32 °F = 273.15 K
Volume: 1 US gallon = 3.785 41 liters
Area: 1 hectare = 10 000 m² = 2.471 acres
Speed: 1 knot = 1.852 km/h = 1 nautical mile/h
Time: 1 year ≈ 365.2425 days = 31 556 952 seconds
Data: 1 GiB = 1 073 741 824 bytes ≠ 1 GB (1 000 000 000 bytes)
Pressure: 1 atm = 101 325 Pa = 14.696 psi = 760 mmHg
Energy: 1 kcal = 4 184 J (food "Calorie")
Force: 1 lbf = 4.448 22 N
Angle: 1 radian = 180/π ≈ 57.296°