Convert Celsius to Kelvin instantly. Enter any °C value to get the exact K equivalent, plus the formula and a full reference table.
The Kelvin scale is the SI base unit of temperature. It starts at absolute zero - the theoretical minimum temperature:
Kelvin values are never negative and are written without the ° symbol.
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 °C | 0 K |
| -200 °C | 73.15 K |
| -100 °C | 173.15 K |
| 0 °C | 273.15 K |
| 20 °C | 293.15 K |
| 37 °C | 310.15 K |
| 100 °C | 373.15 K |
| 200 °C | 473.15 K |
| 1000 °C | 1273.15 K |
0 °C equals 273.15 K. This is the freezing point of water, and the offset value that relates the Celsius and Kelvin scales.
Absolute zero is 0 K = −273.15 °C. It is the lowest possible temperature, where atoms have minimum thermal motion. It cannot be reached in practice but can be approached very closely in laboratory conditions.
Kelvin is the SI base unit of temperature. It starts at absolute zero, making it an absolute scale with no negative values - ideal for physics and chemistry equations (e.g., ideal gas law: PV = nRT). Unlike Celsius or Fahrenheit, Kelvin values are directly proportional to thermal energy.
The Kelvin scale was proposed by William Thomson (Lord Kelvin) in 1848. He chose absolute zero as the starting point based on the theoretical minimum temperature of an ideal gas. The unit "kelvin" is never capitalized and written without the ° symbol.
Convert between Celsius, Fahrenheit, and Kelvin in one place.
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