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Convert Kelvins to Celsius

30 K = -243.15 °C

°C = K − 273.15Decimals

Convert kelvins to Celsius instantly — type in either box and it works both ways.

How to convert kelvins to Celsius

To convert kelvins to degrees Celsius, subtract 273.15 from the Kelvin temperature.

°C = K − 273.15

Example: convert 30 K to °C

30 − 273.15 = -243.15
30 K = -243.15 °C

Kelvins to Celsius conversion chart

Kelvins (K)	Degrees Celsius (°C)
-40 K	-313.15 °C
-20 K	-293.15 °C
-10 K	-283.15 °C
0 K	-273.15 °C
10 K	-263.15 °C
20 K	-253.15 °C
25 K	-248.15 °C
30 K	-243.15 °C
37 K	-236.15 °C
40 K	-233.15 °C
50 K	-223.15 °C
100 K	-173.15 °C
150 K	-123.15 °C
180 K	-93.15 °C
200 K	-73.15 °C

Frequently asked questions

How do you convert kelvins to Celsius?

To convert kelvins to degrees Celsius, subtract 273.15 from the Kelvin temperature. The formula is °C = K − 273.15.

How many degrees Celsius are in one Kelvin?

1 K = -272.15 °C.

How do I convert degrees Celsius back to kelvins?

Use the reverse formula: K = °C + 273.15. For example 1 °C = 274.15 K.

At what temperature are Celsius and Fahrenheit equal?

−40 °C is exactly −40 °F. It is the only temperature where both scales show the same number.

Is this converter free and accurate?

Yes. It is free, uses exact internationally defined conversion factors, and runs in your browser — nothing you type is sent anywhere.

More temperature conversions

°C → °FCelsius → Fahrenheit °F → °CFahrenheit → Celsius °C → KCelsius → Kelvin °F → KFahrenheit → Kelvin K → °FKelvin → Fahrenheit °C → °RCelsius → Rankine °R → °CRankine → Celsius °F → °RFahrenheit → Rankine °R → °FRankine → Fahrenheit K → °RKelvin → Rankine °R → KRankine → Kelvin

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