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Celsius to Kelvin Converter
Convert °C to kelvin instantly, with Fahrenheit alongside.
Enter a temperature to convert it
Enter a temperature and pick its scale. The other scales are calculated live as you type — right here in your browser, with nothing sent to a server.
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How to convert Celsius to Kelvin
Add 273.15 to the Celsius temperature. For example, 25 °C + 273.15 = 298.15 K. A kelvin is the same size as a degree Celsius; only the zero point differs. 0 K is absolute zero (−273.15 °C), so Kelvin values are never negative. Kelvin is written without a degree sign: 298.15 K, not 298.15 °K.
Celsius to Kelvin table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 °C | 0 K |
| -40 °C | 233.15 K |
| 0 °C | 273.15 K |
| 25 °C | 298.15 K |
| 37 °C | 310.15 K |
| 100 °C | 373.15 K |
Common questions
What is room temperature in Kelvin?
Room temperature of 20–25 °C is about 293–298 K. Chemistry often uses 298.15 K (25 °C) as standard.
Why is there no degree sign on Kelvin?
Kelvin is an absolute scale and its unit is the kelvin (K) itself, so it is written 300 K, not 300 °K.
What is 0 °C in Kelvin?
0 °C is 273.15 K, the freezing point of water.