Temperature Converter

Temperature Converter — Celsius, Fahrenheit and Kelvin in One Place

Temperature is measured on three scales you will run into regularly: Celsius (used by most of the world), Fahrenheit (used mainly in the United States), and Kelvin (used in science). This converter takes a value on any one of them and instantly shows you the equivalent on the other two, so you never have to remember which way the formula runs.

The conversions use the exact internationally agreed relationships. To go from Celsius to Fahrenheit, multiply by 9, divide by 5, and add 32 (F = C × 9/5 + 32). To go the other way, subtract 32 first, then multiply by 5 and divide by 9 (C = (F − 32) × 5/9). Kelvin is simply Celsius shifted by 273.15 degrees — 0 K is absolute zero, the coldest temperature physically possible — so K = C + 273.15.

A few reference points make the scales intuitive. Water freezes at 0 °C (32 °F, 273.15 K) and boils at 100 °C (212 °F, 373.15 K) at sea level. Normal human body temperature is about 37 °C (98.6 °F). Comfortable room temperature sits around 20–22 °C (68–72 °F). A hot summer's day of 40 °C is 104 °F — which, in a humid climate, is the kind of heat that turns dangerous. And one piece of trivia worth knowing: −40 °C and −40 °F are exactly the same temperature, the single point where the two scales cross.

Everything runs entirely in your browser — nothing you type is sent to a server — so the converter works instantly and even offline once the page has loaded.

How to Use the Temperature Converter

1. Choose the scale you are converting from (Celsius, Fahrenheit, or Kelvin).
2. Enter your temperature value in the input field.
3. Read the equivalent on the other two scales in the result cards.
4. Switch the "from" scale at any time to convert in a different direction.