Celsius to Kelvin formula
K = °C + 273.15
Add 273.15 to the Celsius value. The degree size is identical on both scales. Temperature scales need an offset as well as a multiplier, which is why they cannot be converted with a single ratio the way length or weight can. To go the other way, use the kelvin to celsius converter.
Celsius to Kelvin conversion table
Common celsius to kelvin values, rounded for reading. The converter above keeps full precision.
| Celsius | Kelvin |
|---|---|
| -40 °C | 233.15 K |
| -20 °C | 253.15 K |
| -10 °C | 263.15 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 |
| 37 °C | 310.15 K |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 75 °C | 348.15 K |
| 100 °C | 373.15 K |
Worked example
To convert 10 °C to kelvin, apply the formula above: the result is 283.15 K. Temperature scales require an offset as well as a multiplier. Kelvin values below absolute zero are mathematically convertible but not physically meaningful.
Frequently asked questions
How do you convert Celsius to Kelvin?
Add 273.15 to the Celsius value. The degree size is identical on both scales. The formula is K = °C + 273.15.
What is 10 °C in K?
10 °C equals 283.15 K. Enter any other reading in the converter above to see it recalculated instantly.
How do I convert Kelvin back to Celsius?
Reverse the formula, swap the units in the converter, or open the kelvin to celsius page.
Related temperature conversions
Need a different pair? Open the full temperature converter to choose any two units.