Convert Celsius to Kelvin
Celsius to Kelvin conversion table
| Celsius (°C) | Kelvin (K) |
|---|---|
| 1 °C | 274.15 K |
| 2 °C | 275.15 K |
| 5 °C | 278.15 K |
| 10 °C | 283.15 K |
| 25 °C | 298.15 K |
| 50 °C | 323.15 K |
| 100 °C | 373.15 K |
| 200 °C | 473.15 K |
| 500 °C | 773.15 K |
| 1000 °C | 1273.15 K |
How to convert celsius to kelvin
Kelvin is the SI base unit for thermodynamic temperature, used in science and engineering. Unlike Celsius and Fahrenheit, Kelvin has no negative values — absolute zero is 0 K (−273.15°C). The size of one kelvin equals one degree Celsius; only the starting point differs.
Formula: K = °C + 273.15. Example: 0°C = 273.15 K (water freezing). 25°C = 298.15 K (room temperature). −40°C = 233.15 K.
Chemistry, physics, and gas law calculations (PV = nRT) require Kelvin. You cannot use Celsius in these equations because they depend on absolute temperature, not relative degrees.
Remember: never say 'degrees Kelvin' — just 'kelvin' or 'K'. The offset 273.15 is exact by definition. 100°C = 373.15 K (water boiling).
Related conversions
Frequently asked questions
Add 273.15 to the Celsius value. K = °C + 273.15.
About 20°C = 293.15 K, often rounded to 293 K in calculations.
Kelvin starts at absolute zero, where molecular motion ceases. Many physical laws (gas behavior, thermal radiation) require absolute temperature.