Kelvin to Celsius Converter

Convert kelvins (K) to degrees Celsius (°C) instantly. Type a value — the result updates as you type, and the swap button converts the other way.

Kelvin to Celsius formula

°C = K − 273.15

To convert kelvins to degrees Celsius, apply the formula °C = K − 273.15. For example, 300 K:

°C = 300 − 273.15
°C = 26.85

So 300 K = 26.85 °C.

Mental math shortcut

This conversion is exact, so there is no need to estimate: just add or subtract 273.15.

Kelvin to Celsius conversion table

Kelvin	Celsius
0 K	-273.15 °C
100 K	-173.15 °C
200 K	-73.15 °C
250 K	-23.15 °C
273.15 K	0 °C
280 K	6.85 °C
290 K	16.85 °C
293.15 K	20 °C
298.15 K	25 °C
300 K	26.85 °C
310 K	36.85 °C
373.15 K	100 °C
500 K	226.85 °C
1000 K	726.85 °C

Celsius back to Kelvin

The same values converted the other way, rounded for everyday use:

Celsius	Kelvin
-273.15 °C	0 K
-173.15 °C	100 K
-73.15 °C	200 K
-23.15 °C	250 K
0 °C	273.15 K
6.85 °C	280 K
16.85 °C	290 K
20 °C	293.15 K

About the units

Kelvin (K)

The kelvin is the SI unit of temperature. It starts at absolute zero (0 K = −273.15 °C) and uses degrees the same size as Celsius, so it never goes negative.

Celsius (°C)

The Celsius scale sets the freezing point of water at 0 °C and its boiling point at 100 °C (at sea level). It is used for everyday temperatures in almost every country.

Frequently asked questions

How do you convert Kelvin to Celsius?

Use °C = K − 273.15. For example, 300 K = 26.85 °C.

What is 300 Kelvin in Celsius?

300 K = 26.85 °C.

How do I convert Celsius back to Kelvin?

Use the reverse formula: K = °C + 273.15.