Temperature Converter

This free temperature converter converts between eight temperature scales — Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Delisle, Newton and Rømer — using exact offset formulas. Unlike simple multiplication, temperature needs offset handling (each scale has a different zero point and step size), which this converter does correctly for every pair.

Pick a source and target scale and type a value for an instant result, or read the "all scales at once" table to see the same temperature in every scale simultaneously. Choose how many decimal places you want (or leave it on Auto), copy any value with one click, and use the quick presets — absolute zero, water freezing, room temperature, body temperature and water boiling — to jump to common reference points. The converter shows the exact formula for the selected pair and warns when a value falls below absolute zero (−273.15 °C), which is not physically possible.