Celsius to Fahrenheit Converter
Free Celsius to Fahrenheit converter. Type a temperature in Celsius, Fahrenheit, or Kelvin and the others update live using F = C × 9/5 + 32.
This Celsius to Fahrenheit converter works in every direction at once. Enter a value in Celsius, Fahrenheit, or Kelvin and the other two fields recalculate instantly, so you never have to remember which way the formula runs. The core relationship is F = C × 9/5 + 32, and Kelvin is simply Celsius plus 273.15.
It's handy for cooking with international recipes, reading weather forecasts from another country, checking a fever in the unit you're used to, or working through physics and chemistry problems. Everything is calculated locally in your browser as you type — nothing is uploaded and there's no rounding surprise beyond a sensible number of decimals.
Variants
Frequently asked questions
What is the formula to convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 (1.8) and add 32. For example, 20°C × 1.8 + 32 = 68°F.
How do I convert Fahrenheit back to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9. For example, (212 − 32) × 5/9 = 100°C.
How does Kelvin relate to Celsius?
Kelvin uses the same degree size as Celsius but starts at absolute zero, so K = °C + 273.15.
At what temperature are Celsius and Fahrenheit equal?
−40 is the same on both scales: −40°C equals −40°F.
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