Kelvin to Celsius formula
°C = K − 273.15
Subtract 273.15 from the Kelvin value. The degree size is identical on both scales. Temperature scales need an offset as well as a multiplier, which is why they cannot be converted with a single ratio the way length or weight can. To go the other way, use the celsius to kelvin converter.
Kelvin to Celsius conversion table
Common kelvin to celsius values, rounded for reading. The converter above keeps full precision.
| Kelvin | Celsius |
|---|---|
| -40 K | -313.15 °C |
| -20 K | -293.15 °C |
| -10 K | -283.15 °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 |
| 37 K | -236.15 °C |
| 40 K | -233.15 °C |
| 50 K | -223.15 °C |
| 75 K | -198.15 °C |
| 100 K | -173.15 °C |
Worked example
To convert 10 K to celsius, apply the formula above: the result is -263.15 °C. Temperature scales require an offset as well as a multiplier. Kelvin values below absolute zero are mathematically convertible but not physically meaningful.
Frequently asked questions
How do you convert Kelvin to Celsius?
Subtract 273.15 from the Kelvin value. The degree size is identical on both scales. The formula is °C = K − 273.15.
What is 10 K in °C?
10 K equals -263.15 °C. Enter any other reading in the converter above to see it recalculated instantly.
How do I convert Celsius back to Kelvin?
Reverse the formula, swap the units in the converter, or open the celsius to kelvin page.
Related temperature conversions
Need a different pair? Open the full temperature converter to choose any two units.