Convert Celsius to Kelvin
Convert Celsius to Kelvin using K = °C + 273.15. Enter a temperature to see the result instantly.
Convert Celsius to Kelvin
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How to convert Celsius to Kelvin
Use the formula K = °C + 273.15. For example, 25°C = 298.15K.
Quick mental estimate: add 273 (exactly 273.15).
Celsius to Kelvin conversion table
| Celsius | Kelvin |
|---|---|
| -40 °C | 233.15 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 |
| 37 °C | 310.15 K |
| 100 °C | 373.15 K |
| Kelvin | Celsius |
|---|---|
| 0 K | -273.15 °C |
| 100 K | -173.15 °C |
| 200 K | -73.15 °C |
| 273.15 K | 0 °C |
| 300 K | 26.85 °C |
| 310 K | 36.85 °C |
| 373.15 K | 100 °C |
| 500 K | 226.85 °C |
About converting Celsius to Kelvin
Celsius (°C) and Kelvin (K) are temperature scales with different zero points, so they convert with a formula rather than a single multiplier: K = °C + 273.15.
Type any temperature above to convert it instantly. For the opposite direction, use the Kelvin to Celsius converter, or the full unit converter.
Reference temperatures
| Reference point | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute zero | -273.15 °C | -459.67 °F | 0 K |
| Coldest air temperature recorded (Vostok, 1983) | -89.2 °C | -128.56 °F | 183.95 K |
| Water freezes | 0 °C | 32 °F | 273.15 K |
| Comfortable room | ≈ 20 °C | ≈ 68 °F | ≈ 293.15 K |
| Normal body temperature | ≈ 37 °C | ≈ 98.6 °F | ≈ 310.15 K |
| Hottest air temperature recorded (Death Valley, 1913) | 56.7 °C | 134.06 °F | 329.85 K |
| Water boils at sea level | 100 °C | 212 °F | 373.15 K |
| Moderate oven (gas mark 4) | 180 °C | 356 °F | 453.15 K |
The scales
The scale used by most of the world: water freezes at 0 °C and boils at 100 °C at sea level; 0 °C = 273.15 K.
Used for: Weather, cooking and medicine worldwide.
The SI base unit of temperature, defined since 2019 by the Boltzmann constant; 0 K is absolute zero.
Used for: Science, colour temperature of lights.
−40 is the one temperature that reads the same in Celsius and Fahrenheit.