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Temperature Converter

Convert temperatures instantly between Celsius, Fahrenheit, Kelvin, and Rankine.

What this tool does

Convert temperatures instantly between Celsius, Fahrenheit, Kelvin, and Rankine. Type an amount in degrees Celsius, choose the units, and the tool converts it to degrees Fahrenheit. It offers 6 temperature units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Degree Celsius, Degree Fahrenheit, Kelvin, Degree Rankine, Degree Delisle, Degree Reaumur. Starts as Degree Celsius.
  • To: Choose one of the same 6 units as "From". Starts as Degree Fahrenheit.

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 and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from degrees Celsius to degrees Fahrenheit:

  • 1 °C = 33.8 °F
  • 5 °C = 41 °F
  • 10 °C = 50 °F
  • 50 °C = 122 °F
  • 100 °C = 212 °F

Multiply the number of degrees Celsius by 1.8, then add 32, to get degrees Fahrenheit. This formula follows from exact definitions.

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

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.
  • Delisle and Reaumur are historical scales, listed for completeness.

FAQs

Q: How do I convert Celsius to Fahrenheit?
A: Multiply the Celsius value by 9/5 (1.8) and add 32. So 0 °C is 32 °F and 100 °C is 212 °F, close to the freezing and boiling points of water at standard pressure.
Q: What is the difference between Kelvin and Rankine?
A: Both start at absolute zero. A kelvin is the size of a Celsius degree and a degree Rankine is the size of a Fahrenheit degree, so one kelvin is 1.8 degrees Rankine.
Q: At what temperature are Celsius and Fahrenheit equal?
A: At -40. Enter -40 with Celsius as the From unit and the result is -40 °F.
Q: Which other scales are listed?
A: Delisle and Reaumur, two historical scales, are shown alongside Celsius, Fahrenheit, Kelvin and Rankine.

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