Add 273.15
K = °C + 273.15
Celsius to Kelvin
Celsius to Kelvin.
Convert Celsius to Kelvin instantly. Enter a temperature to see the result, formula, and quick chart. Values below absolute zero are rejected.
°C to K Absolute-zero check Free to use
Temperature calculator
What’s the temperature?
0 °C is about 273.15 K.
The conversion
The Celsius-to-Kelvin formula.
The Kelvin scale begins at absolute zero.
Convert 20°C
20 + 273.15 = 293.15 K.
Start at absolute zero
0 K equals −273.15°C. Kelvin values cannot be negative.
Quick reference
Celsius to Kelvin chart.
Common Celsius temperatures and Kelvin equivalents.
| Celsius | Kelvin |
|---|---|
| 1 | 274.15 |
| 5 | 278.15 |
| 10 | 283.15 |
| 50 | 323.15 |
| 100 | 373.15 |
Keep exploring
Related conversions.
Reverse the conversion or return to the temperature hub.
Celsius to Kelvin, explained
Good to know.
Quick answers about this temperature conversion.
How do I convert Celsius to Kelvin?
Add 273.15 to the Celsius value. For example, 20°C is 293.15 K.
What is 0°C in Kelvin?
Zero degrees Celsius is 273.15 kelvin.
Can I enter a negative Celsius temperature?
Yes. Celsius values down to −273.15°C are supported. Temperatures below absolute zero are rejected.