Celsius to Kelvins (°C to K)
Formula: K = °C + 273.15
How to convert degrees Celsius to kelvins
K = °C + 273.15
Example: 25 + 273.15 = 298.15, so 25 °C = 298.15 K.
Celsius to kelvin is used in physics, chemistry and engineering, where many formulas (such as the ideal gas law) require absolute temperature.
Only an offset is involved: add 273.15. Room temperature of 25 °C is 298.15 K, and absolute zero is −273.15 °C, i.e. 0 K.
Celsius to Kelvins conversion table
| Celsius (°C) | Kelvins (K) |
|---|---|
| -273.15 °C | 0 K |
| -200 °C | 73.15 K |
| -100 °C | 173.15 K |
| -50 °C | 223.15 K |
| -20 °C | 253.15 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 |
| 200 °C | 473.15 K |
| 500 °C | 773.15 K |
| 1,000 °C | 1,273.15 K |
What is a degree Celsius?
On the Celsius scale water freezes at 0 °C and boils at 100 °C at sea-level pressure. It is used for weather, cooking and medicine in nearly every country except the United States.
What is a kelvin?
The kelvin is the SI base unit of thermodynamic temperature. Its zero point is absolute zero, the lowest possible temperature, and one kelvin step equals one degree Celsius. It is written without a degree sign.
Frequently asked questions
How do I convert degrees Celsius to kelvins?
Use the formula K = °C + 273.15. 25 + 273.15 = 298.15, so 25 °C = 298.15 K.
What is 1,000 °C in K?
1,000 °C = 1,273.15 K.
How do I convert kelvins back to degrees Celsius?
Use the inverse formula °C = K − 273.15, or open the Kelvins to Celsius converter.
More temperature conversions
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