Temperature Converter

Celsius, Fahrenheit and Kelvin — type in any one and the others follow instantly.

The conversion formulas

  • °C → °F: multiply by 9/5, add 32
  • °F → °C: subtract 32, multiply by 5/9
  • °C → K: add 273.15
  • K → °C: subtract 273.15

Reference points

  • Absolute zero: −273.15°C / −459.67°F / 0 K
  • Water freezes: 0°C / 32°F / 273.15 K
  • Body temperature: 37°C / 98.6°F
  • Water boils: 100°C / 212°F / 373.15 K

For other everyday math, see the percentage calculator and tip calculator.

Frequently Asked Questions

How do I convert Celsius to Fahrenheit?

Multiply by 9/5 and add 32. So 20°C × 9/5 + 32 = 68°F. Type any value above and all three scales update instantly.

How do I convert Fahrenheit to Celsius?

Subtract 32, then multiply by 5/9. So (98.6°F − 32) × 5/9 = 37°C — normal body temperature. The converter does this automatically as you type in any field.

What is Kelvin used for?

Kelvin is the scientific temperature scale, starting at absolute zero (−273.15°C), the coldest possible temperature. It is used in physics and chemistry; 0 K means no thermal energy at all.

What are some temperatures worth remembering?

Water freezes at 0°C / 32°F and boils at 100°C / 212°F (at sea level). Body temperature is about 37°C / 98.6°F. A comfortable room is around 21°C / 70°F.