Celsius to kelvins
For science and engineering. Kelvin starts at absolute zero, so 0 °C is 273.15 K.
1 degree Celsius = 274.15 kelvins
Formula: K = °C + 273.15
How to convert
How to convert degrees Celsius to kelvins
Temperature scales have different starting points, so converting takes two steps rather than one multiplication. Use this formula:
K = °C + 273.15
Example: 20 degrees Celsius = 293.15 kelvins.
Celsius to kelvins table
| degrees Celsius (°C) | kelvins (K) |
|---|---|
| -40 °C | 233.15 K |
| -30 °C | 243.15 K |
| -20 °C | 253.15 K |
| -10 °C | 263.15 K |
| -5 °C | 268.15 K |
| 0 °C | 273.15 K |
| 5 °C | 278.15 K |
| 10 °C | 283.15 K |
| 15 °C | 288.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 30 °C | 303.15 K |
| 35 °C | 308.15 K |
| 37 °C | 310.15 K |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 60 °C | 333.15 K |
| 80 °C | 353.15 K |
| 100 °C | 373.15 K |
About the units
- Celsius sets 0° at the freezing point and 100° at the boiling point of water at sea level. It is used in most of the world.
- The kelvin is the SI unit of temperature. It starts at absolute zero, the coldest possible temperature, so there are no negative kelvins, and it is written without "degrees".
Convert kelvins to degrees Celsius · All temperature conversions
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Frequently asked questions
What is the formula to convert Celsius to kelvins?
K = °C + 273.15. For example, 20 degrees Celsius is 293.15 kelvins.
What is 0 °C in kelvins?
0 °C is 273.15 K.
What is 100 °C in kelvins?
100 °C is 373.15 K.
At what temperature are Celsius and Fahrenheit the same?
At −40: minus 40 °C is exactly minus 40 °F.