Temperature converter

Convert between Celsius, Fahrenheit and Kelvin

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How it works

To change Celsius to Fahrenheit, multiply by 9, divide by 5, then add 32. To change Fahrenheit to Celsius, subtract 32, multiply by 5, then divide by 9. To change Celsius to Kelvin, add 273.15. So 100 °C is 212 °F, and also 373.15 K.

°F = °C × 9 ÷ 5 + 32

Temperature scales start at different points, so a conversion needs an offset as well as a multiplier. The Kelvin scale starts at absolute zero, the coldest temperature possible.

Worked example. To change 100 °C to Fahrenheit: 100 × 9 ÷ 5 + 32 = 212 °F. To go back: (212 − 32) × 5 ÷ 9 = 100 °C.

Examples

From	To
0 Celsius	32 Fahrenheit
37 Celsius	98.6 Fahrenheit
100 Celsius	212 Fahrenheit
-40 Celsius	-40 Fahrenheit
0 Celsius	273.15 Kelvin
72 Fahrenheit	≈ 22.22 Celsius

What this tool doesn’t cover

Values below absolute zero are refused, because they can’t exist.
Results show up to two decimal places.

Questions

At what temperature are Celsius and Fahrenheit equal?

They are equal at −40. So −40 °C is the same as −40 °F.

What is normal body temperature?

It is usually given as about 37 °C, which is 98.6 °F. It varies a little from person to person.

Why does Kelvin have no degree sign?

Kelvin is an absolute scale, so we say 300 kelvin, not 300 degrees.

How do I convert Celsius to Fahrenheit?

Multiply by 9, divide by 5, then add 32. So 25 °C is 77 °F.

How do I convert Fahrenheit to Celsius?

Subtract 32, then multiply by 5 and divide by 9. So 100 °F is about 37.8 °C.

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Sources: NIST Office of Weights and Measures (opens in a new tab), BIPM: SI units (opens in a new tab)