Temperature Converter

Convert Temperature Online — Celsius, Fahrenheit and Kelvin

Type a temperature in any of the three scales and see it in all of them at once. It's a quick way to make sense of a weather forecast, an oven setting, or a science problem written in a different unit.

How to Convert Temperatures

Enter your number, choose whether it's in Celsius, Fahrenheit, or Kelvin, and the three results update immediately, with the scale you entered highlighted. Values are rounded to two decimal places, so 100 °C shows as 212 °F and 373.15 K.

The Formulas Behind It

To convert Celsius to Fahrenheit, multiply by 9/5 and add 32. To go from Fahrenheit to Celsius, subtract 32 and multiply by 5/9. Kelvin is simply Celsius plus 273.15, and it has no degree symbol. Some useful reference points: water freezes at 0 °C (32 °F, 273.15 K) and boils at 100 °C (212 °F, 373.15 K) at sea-level pressure, normal body temperature is about 37 °C (98.6 °F), a comfortable room is around 20 to 22 °C (68 to 72 °F), and −40 is the one temperature that reads the same in Celsius and Fahrenheit. Absolute zero is 0 K, which is −273.15 °C or −459.67 °F.

Good Uses for This Tool

Converting oven temperatures in recipes (180 °C is 356 °F), understanding weather abroad, checking fever readings, doing physics and chemistry homework that uses Kelvin, and translating device or appliance specifications.

Is It Actually Private?

Yes. The calculation runs in your browser — nothing you enter is sent to a server or stored.