Convert Celsius to Kelvin
1 °C = 274.15 K. Enter any value below.
Converted to every unit
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Celsius to Kelvin formula
K = °C + 273.15
The Celsius scale sets water's freezing point at 0 °C and boiling point at 100 °C at sea level. Kelvin is the SI temperature unit; 0 K is absolute zero, and a change of 1 K equals a change of 1 °C.
Worked example
Using the formula, 25 °C = 298.15 K.
Celsius to Kelvin conversion table
| Celsius | Kelvin |
|---|---|
| -40 °C | 233.15 K |
| -20 °C | 253.15 K |
| -10 °C | 263.15 K |
| 0 °C | 273.15 K |
| 10 °C | 283.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 30 °C | 303.15 K |
| 32 °C | 305.15 K |
| 37 °C | 310.15 K |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 60 °C | 333.15 K |
| 70 °C | 343.15 K |
| 80 °C | 353.15 K |
| 90 °C | 363.15 K |
| 98.6 °C | 371.75 K |
| 100 °C | 373.15 K |
| 150 °C | 423.15 K |
| 200 °C | 473.15 K |
| 212 °C | 485.15 K |
| 300 °C | 573.15 K |
| 350 °C | 623.15 K |
| 400 °C | 673.15 K |
| 450 °C | 723.15 K |
| 500 °C | 773.15 K |
Frequently asked questions
What is 0 °C in Kelvin?
0 °C equals 273.15 K.
How do I convert celsius to kelvin?
Use the formula K = °C + 273.15. For example, 25 °C = 298.15 K.
Last reviewed: October 2026 · Uses exact, internationally defined conversion factors.