While Fahrenheit and Celsius are used in daily life, in the world of science, the Kelvin (K) scale is king. If you've ever wondered what Kelvin is or how to convert Celsius to Kelvin, this simple guide has the answers.

What is the Kelvin Scale?

The Kelvin scale is an "absolute" temperature scale, meaning its starting point, 0 K, is absolute zero—the coldest possible temperature in the universe, where all atomic motion ceases. Because it starts at a true zero, Kelvin is the standard for scientific calculations.

How to Convert Celsius to Kelvin

The conversion from Celsius to Kelvin is the easiest one in all of thermodynamics. There is no complex multiplication or division.

The Formula:
Kelvin = Celsius + 273.15

You simply take your Celsius temperature and add 273.15.

Example:
The freezing point of water is 0°C. To convert this to Kelvin:

• 0°C + 273.15 = 273.15 K

How to Convert Kelvin to Celsius

To convert from Kelvin to Celsius, you just do the reverse.

The Formula:
Celsius = Kelvin - 273.15

Example:
The boiling point of nitrogen is 77 K. To convert this to Celsius:

• 77 K - 273.15 = -196.15°C

Internal Link: For conversions involving all three major scales, visit our main Temperature Converter.