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Temperature Unit Converter

Conversion

Convert Celsius, Fahrenheit and Kelvin with live results, presets and absolute-zero validation.

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Unit conversion

Temperature converter for Celsius, Fahrenheit and Kelvin. Enter a value and pick the From and To units to see the result live, with the value listed in all three units below it.

See more about the Temperature Unit Converter

Values below absolute zero are rejected.

Examples

Fahrenheit to Celsius

98.6 °F → 37 °C

Results are rounded to 12 significant digits with trailing zeros dropped, and the output is a bare number with no unit suffix.

Below absolute zero

-300 °C → Temperature cannot be below absolute zero.

The check uses the source value, so 0 K is valid and converts to -273.15 °C.

Key features

  • Celsius, Fahrenheit, Kelvin
  • Live results
  • All three units listed
  • Swap units

Quick answers for Temperature Unit Converter

What does this tool do?
Convert Celsius, Fahrenheit and Kelvin with live results, presets and absolute-zero validation.
What should I know before using it?
Results update as you change the value and units. Invalid numbers are rejected, as are temperatures below absolute zero. Calculations use floating-point arithmetic, so displayed results can be rounded.
Why does 0 K convert but -1 K does not?
The absolute-zero check applies to the source value. 0 K is valid and equals -273.15 °C, while any Kelvin value below 0 is rejected.