Convert celsius to kelvin instantly. Type a value below to see the result, or press Swap direction to convert kelvin back to celsius. The tool uses the exact conversion factor, and a quick-reference table is below.
Kelvin
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Conversion formula
Kelvin = °C + 273.15
Add 273.15. Kelvin has no degree symbol, and 0 K is absolute zero.
Quick reference table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 °C | 0 K |
| -40 °C | 233.15 K |
| 0 °C | 273.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 37 °C | 310.15 K |
| 100 °C | 373.15 K |
| 500 °C | 773.15 K |
| 1000 °C | 1273.15 K |
| 5000 °C | 5273.15 K |
Frequently asked questions
How do I convert celsius to kelvin?
Kelvin = °C + 273.15
How do I convert kelvin back to celsius?
Use the reverse formula, or press Swap direction in the converter above. You can also use our reverse converter.
How many kelvin is 25 °C?
25 °C is 298.15 K.
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Conversions use standard factors. Check critical measurements.