Celsius to Kelvin – convert °C to K
Convert Celsius to Kelvin (°C to K) for science, engineering, chemistry and thermodynamics. This page opens the main temperature converter with °C → K pre-selected so you can enter any Celsius temperature and get Kelvin instantly.
Open the interactive °C → K converter:
Use main converter (°C → K) or switch to K → °COn the homepage you can also convert between Celsius, Fahrenheit and Rankine, and swap direction with a single click. The Tool Hub is handy for study timers and focus sessions.
Quick reference: °C to K
The exact relationship is: K = °C + 273.15.
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 °C | 0 K (absolute zero) |
| 0 °C | 273.15 K |
| 25 °C | 298.15 K |
| 37 °C | 310.15 K (body temperature) |
| 100 °C | 373.15 K (boiling water) |
| 200 °C | 473.15 K |
How to convert °C to K
Use this simple formula:
Kelvin = Celsius + 273.15
Examples:
- 20 °C + 273.15 = 293.15 K
- -40 °C + 273.15 = 233.15 K
- 150 °C + 273.15 = 423.15 K
Where °C → K is used
- Physics and chemistry calculations that require absolute temperature.
- Gas law problems (ideal gas law, combined gas law, etc.).
- Engineering calculations for efficiency, heat transfer or thermodynamics.
- Converting everyday temperatures into the SI base temperature unit.
Related temperature converters on this site
Internally, the converter already uses Kelvin as the base unit, so °C, °F and Rankine all stay consistent with each other.