Convert Kelvin to Celsius
Convert Kelvin to Celsius instantly. Formula, worked examples and a full reference table from -40° upward.
Last updated
Converting Kelvin to Celsius is not a simple multiplication, because the two scales have different zero points as well as different degree sizes. The conversion needs both a scaling step and an offset.
Enter any temperature above and the result updates as you type. The formula and a reference table covering everyday temperatures follow below.
Kelvin to Celsius formula
To go the other way, use K = °C + 273.15.
About these units
Kelvin starts at absolute zero, the point where thermal motion stops. It uses Celsius-sized degrees and takes no degree symbol.
The Celsius scale sets zero at the freezing point of water and 100 at its boiling point, both at standard atmospheric pressure.
Kelvin to Celsius conversion table
| Kelvin | Celsius |
|---|---|
| -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 |
Frequently asked questions
How many celsiuss are in a kelvin? +
Temperature scales cannot be compared this way, because they do not share a zero point. Use the formula °C = K − 273.15 instead.
What is 25 K in °C? +
25 K equals -248.15 °C. Apply the formula °C = K − 273.15.
How do I convert celsius back to kelvin? +
Use K = °C + 273.15. The converter above handles both directions, or see our dedicated Celsius to Kelvin page.