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°F to °C

Convert Fahrenheit to Celsius instantly. Enter a temperature in degrees Fahrenheit and read it in degrees Celsius.

What this tool does

Convert Fahrenheit to Celsius instantly. Enter a temperature in degrees Fahrenheit and read it in degrees Celsius. Type an amount in degrees Fahrenheit, choose the units, and the tool converts it to degrees Celsius. It converts between these two temperature units, in either direction.

Inputs

  • Value: A number.
  • From: Choose one: Degree Fahrenheit, Degree Celsius. Starts as Degree Fahrenheit.
  • To: Choose one of the same 2 units as "From". Starts as Degree Celsius.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount. It appears once every required field has a valid value.

Worked examples

Conversions from degrees Fahrenheit to degrees Celsius:

  • 1 °F ≈ -17.222222 °C
  • 5 °F = -15 °C
  • 10 °F ≈ -12.222222 °C
  • 50 °F = 10 °C
  • 100 °F ≈ 37.777778 °C

Multiply the number of degrees Fahrenheit by 0.5555555556, then subtract 17.77777778, to get degrees Celsius. The formula follows from exact definitions. 0.5555555556 and 17.77777778 have more digits than fit here, so they are shown rounded.

Sources: Degree Fahrenheit: NIST SP 811 (2008), Appendix B.8. Degree Celsius: SI Brochure, 9th edition (2019).

Limitations

  • Converts a temperature reading only. A temperature difference, such as a rise of 10 degrees, converts differently because it has no offset.
  • Nothing below absolute zero is accepted.

FAQs

Q: How do I convert Fahrenheit to Celsius?
A: Subtract 32, then multiply by 5/9.
Q: What is 32 °F and 212 °F in Celsius?
A: 32 °F is 0 °C and 212 °F is 100 °C, close to the freezing and boiling points of water at standard pressure.
Q: Can I convert the other way?
A: Yes. Choose Celsius as the From unit and Fahrenheit as the To unit.

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