1 degree Celsius = 274.15 kelvins
Convert degrees Celsius to kelvins.
Both directions on one page — swap the units and the whole thing runs backwards.
Type a value, or “5cm to in”
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The formula
K = °C × 1 + 273.15
Worked through with a real value: 25 degrees Celsius = 298.15 kelvins.
Going the other way: °C = K × 1 − 273.15, so 1 kelvin = -272.15 degrees Celsius.
What each unit is
- degree Celsius °C
- Zero at the freezing point of water and 100 at its boiling point, at standard pressure. The everyday scale almost everywhere outside the United States.
- kelvin K
- The SI base unit. Zero is absolute zero, and a kelvin is the same size as a degree Celsius, so the two differ only by 273.15.
Conversion tables
| degrees Celsius (°C) | kelvins (K) |
|---|---|
| -40 | 233.15 |
| -30 | 243.15 |
| -20 | 253.15 |
| -10 | 263.15 |
| 0 | 273.15 |
| 5 | 278.15 |
| 10 | 283.15 |
| 15 | 288.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 30 | 303.15 |
| 35 | 308.15 |
| 37 | 310.15 |
| 40 | 313.15 |
| 100 | 373.15 |
| kelvins (K) | degrees Celsius (°C) |
|---|---|
| -40 | -313.15 |
| -30 | -303.15 |
| -20 | -293.15 |
| -10 | -283.15 |
| 0 | -273.15 |
| 5 | -268.15 |
| 10 | -263.15 |
| 15 | -258.15 |
| 20 | -253.15 |
| 25 | -248.15 |
| 30 | -243.15 |
| 35 | -238.15 |
| 37 | -236.15 |
| 40 | -233.15 |
| 100 | -173.15 |
Questions
What is 25 °C in K?
25 degrees Celsius = 298.15 kelvins.
How do I convert degrees Celsius to kelvins?
Use K = °C × 1 + 273.15. The two scales have different zero points as well as different degree sizes, so a single multiplication is not enough.
What is 10 °C in K?
10 degrees Celsius = 283.15 kelvins.
What is 100 °C in K?
100 degrees Celsius = 373.15 kelvins.
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