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Celsius to Fahrenheit converter

Convert degrees Celsius to Fahrenheit and back, with a chart of common temperatures. °F = °C × 9/5 + 32. Free and instant.

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  • Windows, Mac, Android, iPhone

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About this tool

Fahrenheit shows up in recipes, oven manuals, weather forecasts and thermometers in several countries. Type a temperature in Celsius to get it in Fahrenheit, or switch the direction in one click.

When to use it

Cooking and ovens

A recipe at 350 °F bakes at about 177 °C; 180 °C is 356 °F.

Weather and travel

A forecast of 86 °F means 30 °C: handy before a trip or when reading a foreign forecast.

Health

A thermometer set to °F shows 98.6 for 37 °C: check a fever without mixing up the scales.

How to use

  1. Type a temperature in degrees Celsius.
  2. Read the result in degrees Fahrenheit.
  3. Click ⇄ to convert °F to °C.

How it works

Unlike lengths or weights, the two scales don't share the same zero, so you can't just multiply. The tool applies °F = °C × 9/5 + 32 by going through kelvins, which keeps conversions exact both ways.

The chart of common temperatures and the value in kelvins update as you type, in your browser.

Tips for best results

  • For a quick estimate, double the °C and add 30 (20 °C ≈ 70 °F).
  • The other way, subtract 30 from the °F and halve it.
  • A difference of 1 °C equals a difference of 1.8 °F.
  • Type negative temperatures with a minus sign: -10.

Common problems and fixes

The result looks wrong for a temperature difference

The tool converts a temperature, not a difference. For a difference, just multiply by 1.8.

The minus sign isn't accepted

Use the keyboard hyphen (-) right before the number, with no space.

I want Fahrenheit to Celsius

Click the ⇄ button: the direction and the chart switch.

Frequently asked questions

What is the conversion formula?

°F = °C × 9/5 + 32, and the other way °C = (°F − 32) × 5/9. So 20 °C is 68 °F.

At what temperature do both scales meet?

At −40: −40 °C = −40 °F.

What is normal body temperature in Fahrenheit?

About 37 °C, or 98.6 °F. A fever starts around 38 °C, or 100.4 °F.

What about kelvins?

Kelvin starts at absolute zero: 0 °C = 273.15 K. The unit list below the chart also gives the value in kelvins.

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Still stuck?

Ask on the forum: the category, the tool, your device sheet and the test result will be filled in for you.