Converting Celsius to Kelvin is necessary in all thermodynamic calculations, ideal gas chemistry and astrophysics. Kelvin is the only temperature scale that starts at absolute zero.
To convert from Celsius to Kelvin, simply add 273.15 to the Celsius value. No multiplication is needed since both graduations are identical.
📐 Formula
K = °C + 273.15
📊 Reference table
| Celsius (°C) | Kelvin (K) | Reference |
|---|---|---|
| -273.15 | 0 | Absolute zero |
| -200 | 73.15 | Liquid nitrogen |
| -100 | 173.15 | Very low temperature |
| 0 | 273.15 | Water freezing point |
| 20 | 293.15 | Room temperature |
| 37 | 310.15 | Human body |
| 100 | 373.15 | Boiling water |
| 1000 | 1273.15 | Molten metal |
💡 Practical examples
Example 1: 25°C (ideal room temperature)
25 + 273.15 = 298.15 K. A reference value widely used in chemistry for 'room temperature' calculations.
Example 2: 0°C (freezing)
0 + 273.15 = 273.15 K. The freezing point of water in Kelvin.
Example 3: -273.15°C (absolute zero)
-273.15 + 273.15 = 0 K. Absolute zero, the starting point of the Kelvin scale.