How to convert Celsius to Kelvin
- Take the value in Celsius.
- Use the formula K = °C + 273.15.
- For example, 20 °C is 293.15 K.
About Celsius and Kelvin
To convert Celsius to Kelvin, add 273.15. A step of one kelvin is the same size as one Celsius degree, so only the zero point moves: 0 K is absolute zero, −273.15 °C.
Physics and chemistry use Kelvin because gas laws and many formulas only work on an absolute scale. Data tables are often given at 25 °C, which is 298.15 K.
Examples
- 20 °C (room temperature) is 293.15 K
- 100 °C (boiling water at sea level) is 373.15 K
- 37 °C (normal body temperature) is 310.15 K
- −196 °C (liquid nitrogen) is 77.15 K
Celsius to Kelvin chart
| Celsius (°C) | Kelvin (K) |
|---|---|
| −273.15 | 0 |
| −270 | 3.15 |
| −200 | 73.15 |
| −196 | 77.15 |
| −100 | 173.15 |
| −80 | 193.15 |
| −50 | 223.15 |
| −40 | 233.15 |
| −20 | 253.15 |
| −10 | 263.15 |
| 0 | 273.15 |
| 10 | 283.15 |
| 15 | 288.15 |
| Celsius (°C) | Kelvin (K) |
|---|---|
| 20 | 293.15 |
| 25 | 298.15 |
| 30 | 303.15 |
| 37 | 310.15 |
| 40 | 313.15 |
| 50 | 323.15 |
| 100 | 373.15 |
| 150 | 423.15 |
| 200 | 473.15 |
| 500 | 773.15 |
| 1,000 | 1,273.15 |
| 1,500 | 1,773.15 |