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.
Where these come from
- 1 degree Celsius is 1 kelvin in size, counted from 273.15 K
Every other number on this page is computed from those, and each category is pinned to conversions worked out by hand from the units' primary definitions before it ships.
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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