How to convert celsius to kelvin
- Type the value in celsius (°C) in the box above.
- The result in kelvin appears instantly, along with the same value in every other unit of temperature.
- Press ⇄ to convert the other way.
Formula
K = °C + 273.15. Example: 25 °C = 298.15 K.
Celsius to kelvin is needed in physics, chemistry and engineering, where absolute temperature matters, for example in gas laws and colour temperature. The kelvin scale starts at absolute zero (−273.15 °C) and uses the same step size as Celsius, so you just add 273.15. Room temperature, 20 °C, is 293.15 K. Kelvin is written without a degree sign.
°C to K conversion chart
| Celsius | Kelvin |
|---|---|
| -273.15 °C | 0 K |
| -196 °C | 77.15 K |
| -40 °C | 233.15 K |
| 0 °C | 273.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 37 °C | 310.15 K |
| 100 °C | 373.15 K |
| 500 °C | 773.15 K |
| 1,000 °C | 1,273.15 K |
FAQ
What is 0 °C in kelvin?
273.15 K.
How do I convert °C to K?
Use K = °C + 273.15. Or type the value above and the converter does it for you.
How do I convert K back to °C?
Subtract 32 from °F and multiply by 5/9.