Temperature Converter

Temperature: convert between Celsius, Fahrenheit, and Kelvin using the exact NIST-defined formulas.

Works for any combination of the units above -- every value converts through the same verified base-unit math used on the individual pages.

How Temperature Units Relate

Celsius and Kelvin are both metric temperature scales, differing only by a fixed 273.15 offset. Fahrenheit, used mainly in the United States, has both a different zero point and a different degree size than Celsius, which is why converting between them needs a full formula rather than a single multiplication.

All Temperature Converters

Each of these has its own page with the exact formula, a reference table, and answers to common questions.

Celsius to Fahrenheit Fahrenheit to Celsius Celsius to Kelvin

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