Length, weight, temperature, volume, area and speed — pick a category, type a value in either box, and the conversion happens as you type.
Three quick steps — no account, no upload, nothing leaves your device.
Choose Length, Weight, Temperature, Volume, Area or Speed from the tabs at the top.
Type in either box and pick its unit — the other box updates instantly as you type.
Tap the swap button in the middle to flip the two units around, with the formula shown underneath.
Quick answers about how this calculator works.
They use the exact international definitions — for example 1 inch is exactly 2.54 cm, 1 pound is exactly 0.45359237 kg and 1 US gallon is exactly 3.785411784 litres — so results match official standards.
The US gallon (3.785411784 litres) and the US cup (236.588 ml). The UK imperial gallon (4.546 litres) is larger, so check which one your recipe or container means.
Yes. Both boxes are editable — type in either one and the other converts in reverse, which makes it easy to work backwards from a target value.
With the exact formulas: °F = (°C × 9/5) + 32 and K = °C + 273.15. The formula for the pair you have selected is always shown under the converter.
Completely. Everything runs in your browser — nothing is uploaded, stored, or shared.