Temperature Converter

Convert the three most common temperature scales.

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Calculation details

All calculations run locally in your browser. No data is stored.

Input temperature20

Uses the exact Celsius, Fahrenheit, and kelvin scale relationships. Values below absolute zero are not physically meaningful.

How this calculator works

Celsius and Fahrenheit use the exact 5-to-9 degree-size relationship and a 32-degree offset. Kelvin uses an exact 273.15 offset from Celsius.

Change any input to update the estimate instantly. Your entries never leave your device.

Frequently asked questions

What is absolute zero?

Absolute zero is 0 K, equal to −273.15 °C or −459.67 °F.

Is kelvin written with a degree symbol?

No. The SI unit is written as kelvin or K without a degree symbol.