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Kelvin temperature conversion formulas
Conversion from to Formula
Kelvins degrees Celsius °C = K - 273.15
degrees Celsius Kelvins K = °C + 273.15
Kelvins degrees Fahrenheit °F = K × 1.8 − 459.67
degrees Fahrenheit Kelvins K = (°F + 459.67) / 1.8
Kelvins electronvolts K / 11,604.5 = eV
electronvolts Kelvins eV × 11,604.5 = K
Note that for temperature intervals rather than temperature readings,
1 K = 1 °C and 1 K = 1.8 °F
Comparisons among various temperature scales
Conversion calculator for units of temperature

The kelvin (symbol: K) is the SI (Système International d'Unités) unit of temperature and is one of the seven SI base units. The kelvin is a unit measure of temperature on the thermodynamic (absolute) temperature scale.

Key Temperatures

Some key temperatures relating kelvin values to other scales are shown in the below table.

Point Kelvin Celsius Fahrenheit
Absolute zero

(precisely by definition)

0 K –273.15 °C −459.67 °F
Water's freezing point 273.15 K 0 °C 32 °F
Water’s triple point

(precisely by definition)

273.16 K 0.01 °C 32.018 °F
Water’s boiling point1 373.1339 K 99.9839 °C 211.9710 °F

1 For Vienna Standard Mean Ocean Water at one standard atmosphere (101.325 kPa) when calibrated solely per the two-point definition of thermodynamic temperature.

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