How it works
Unit Converter — Convert length, weight, temperature, area and volume units. All processing happens in your browser — no upload, no signup, no email required. Free forever.
Frequently asked questions
Which units are supported?
We cover length (mm/cm/m/km/in/ft/yd/mi), weight (mg/g/kg/t/oz/lb), temperature (°C/°F/K), area (mm²–km², ha, ac, ft²), volume (ml, L, m³, tsp, tbsp, cup, gallons), time (ms→weeks) and speed (m/s, km/h, mph, knots).
Are conversions exact?
Conversions use the standard internationally-accepted ratios (e.g. 1 inch = 0.0254 m exactly). We display 8 significant digits and switch to scientific notation for extreme magnitudes.
Why does swapping the units flip the result?
Each unit has a 'to base' and 'from base' function. Swapping just runs the inverse conversion — the underlying value never changes.
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