Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine. Type in any field and the others update instantly.
How to use the Temperature Converter
- Type a temperature in any of the fields.
- All other scales update automatically.
Temperature formulas
°F = °C × 9/5 + 32. °C = (°F − 32) × 5/9. K = °C + 273.15. °R = °F + 459.67.
Handy references: water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level; normal body temperature is about 37 °C (98.6 °F).
Frequently asked questions
How do I convert Celsius to Fahrenheit quickly?
Double the Celsius value and add 30 for a rough estimate; for the exact value multiply by 1.8 and add 32.
When are Celsius and Fahrenheit equal?
At −40°: −40 °C equals −40 °F.