Convert Celsius to Kelvin
Convert Celsius temperatures into Kelvin for physics, chemistry and engineering calculations where absolute temperature is required.
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1 °C = 274 K
Quick reference
| Celsius | Kelvin |
|---|---|
| -273.15 | 0 K (absolute zero) |
| -40 | 233.15 K |
| 0 | 273.15 K |
| 25 | 298.15 K |
| 100 | 373.15 K |
| 1000 | 1273.15 K |
Formula
K = °C + 273.15
Frequently asked questions
- Why are Celsius and Kelvin offset by 273.15?
- 0 K is absolute zero — the lowest possible temperature. Celsius is defined relative to water's freezing point, which sits 273.15 degrees above absolute zero.
- Is Kelvin written with a degree sign?
- No. By convention it is written 'K' (not '°K'); the degree symbol was dropped in 1967 to mark Kelvin as an absolute scale.