Unit Converter

Unit conversion sits behind a surprising number of everyday decisions: a recipe from a US website in cups and ounces, a furniture measurement in inches when your tape measure reads centimetres, a weather forecast in Fahrenheit when you think in Celsius, a parcel weight limit in pounds when you know kilograms. This tool covers five categories — length, weight and mass, temperature, area and volume — with all the units people actually search for.

Conversion uses a base-unit model: every unit is defined by its precise ratio to a standard (metre, kilogram, kelvin), so converting between any two units is always exact, never a chain of approximations. Temperature is handled correctly with offset formulas rather than simple ratios, so Fahrenheit and Celsius conversions are accurate at all values, not just at common reference points.

The swap button reverses direction and recalculates — if you just converted 5 miles to kilometres and now want to go back, one click does it. All conversions are instant as you type, with results shown to enough significant figures to be useful without false precision. Everything runs in your browser: no server, no upload, and the same tool that converts a kitchen measurement also handles engineering-scale values without any range limits.