Live Temperature Converter
Convert temperature between Celsius, Fahrenheit and Kelvin, updating as you type.
Temperature, converted live
Temperature conversion comes up constantly — a foreign weather forecast, an oven, a science figure — and this does it live between Celsius, Fahrenheit and Kelvin, so the result updates as you type rather than after a button press. It is the quick, frictionless way to move between the scales.
Type a temperature and watch it convert in real time.
Why temperature is the tricky conversion
Temperature is unlike most conversions because the scales do not share a zero — zero Celsius and zero Fahrenheit are different temperatures, and Kelvin starts at absolute zero, the coldest anything can be. So converting is not a simple multiplication; it involves a shift as well as a scaling, which is exactly why doing it in your head is awkward. Celsius and Fahrenheit cross at forty below, a handy fact, and Kelvin is just Celsius shifted to start from absolute zero. Seeing all three update together makes the relationships clear.
Common questions
Why can't I convert temperature by just multiplying?
Because the scales do not share a zero, so converting involves a shift as well as a scaling, unlike length or weight.
What is Kelvin?
The scientific scale that starts at absolute zero, the coldest possible temperature. It is Celsius shifted so zero is that point.
Is anything uploaded?
No. The conversion happens in your browser.