Kelvin to Celsius Converter (K to °C)

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Formula: °C = K − 273.15. For example, 20 K equals -253.15 °C.

How to convert kelvins to degrees Celsius

°C = K − 273.15

The kelvin starts at absolute zero (−273.15 °C), the coldest temperature physically possible. It is the SI base unit used throughout science.

Celsius sets 0° at water's freezing point and 100° at its boiling point at sea level. It is the world's standard scale for weather and cooking outside the US.

Kelvin to Celsius conversion table

Kelvin (K)	Celsius (°C)
-40 K	-313.15 °C
-30 K	-303.15 °C
-20 K	-293.15 °C
-10 K	-283.15 °C
-5 K	-278.15 °C
0 K	-273.15 °C
5 K	-268.15 °C
10 K	-263.15 °C
15 K	-258.15 °C
20 K	-253.15 °C
25 K	-248.15 °C
30 K	-243.15 °C
35 K	-238.15 °C
37 K	-236.15 °C
40 K	-233.15 °C
45 K	-228.15 °C

Need the opposite direction? Use the Celsius to Kelvin converter, or read our complete guide to temperature conversions for every formula in one place.

Frequently asked questions

What is the formula to convert Kelvin to Celsius?

°C = K − 273.15. For example, 25 K equals -248.15 °C.

What is 100 K in °C?

100 K equals -173.15 °C, using the formula °C = K − 273.15.

Is my data stored when I use this converter?

No. The conversion runs entirely in your browser with JavaScript — nothing you type is sent to a server, logged or stored.