Free Online Unit Converter — 80+ Converters
Convert any unit instantly. Length, weight, temperature, currency, pressure, velocity, density, acceleration, torque, flow rate, viscosity, surface tension, angle, energy, power, data storage, and 60+ more. Live currency rates across 38 currencies with automatic offline fallback.
All conversions use precise mathematical constants validated against international SI standards. No registration required — completely free.
38 currencies · Live rates
13 units · nm to light years
10 units · mcg to metric tons
7 scales · Kelvin & Rankine
Bar, PSI, atm, Pa, Torr
mph, km/h, knots, Mach, m/s
kg/m³, g/cm³, lb/ft³
m/s², g-force, Gal, ft/s²
N·m, lbf·ft, kgf·m, ozf·in
m³/h, L/min, gal/min, ft³/s
Pa·s, Poise, Centipoise, cSt
N/m, dyn/cm, lbf/ft, mN/m
Degrees, radians, gradians
Joules, kWh, BTU, calories
KB, MB, GB, TB, bits & bytes
Binary, decimal, hex, octal