Celsius to Kelvin Calculator
Enter a Celsius temperature to convert it to Kelvin.
Celsius to Kelvin Formula
Kelvin is the absolute temperature scale used in science. To convert Celsius to Kelvin, add 273.15.
Formula: K = °C + 273.15
For example, 20°C equals 293.15 K.
Because Kelvin starts at absolute zero, this conversion is standard in thermodynamics, laboratory calculations, and technical formulas where negative Celsius values would make the math less intuitive.
Common Celsius to Kelvin Values
| Celsius | Kelvin |
|---|---|
| -273.15°C | 0 K |
| 0°C | 273.15 K |
| 20°C | 293.15 K |
| 25°C | 298.15 K |
| 100°C | 373.15 K |
What Is Kelvin Used For?
Kelvin is widely used in physics, chemistry, engineering, and thermal analysis because it starts at absolute zero. It avoids negative temperatures in many scientific formulas.
For reverse conversion, use our Kelvin to Celsius Converter. If you need weather-style comparisons, try Celsius to Fahrenheit.
The converter is helpful whenever you want to move from everyday temperature language into a scientific scale used in equations, specifications, and technical charts.
Celsius to Kelvin FAQ
What is the formula for Celsius to Kelvin?
The formula is K = °C + 273.15. You add 273.15 to convert a Celsius temperature to Kelvin.
Why is Kelvin used in science?
Kelvin starts at absolute zero, so it is the standard temperature scale for physics, chemistry, and many engineering calculations.
Can Kelvin values be negative?
In standard thermodynamics, Kelvin values are not negative because 0 K represents absolute zero.