Celsius to Kelvin converter

How to convert degrees Celsius to kelvin

To convert degrees Celsius to kelvin, use K = °C + 273.15. For example, 25 °C is 298.15 K. Type any value in the converter above and the result updates instantly.

The Celsius to Kelvin formula

The conversion is K = °C + 273.15. One degree Celsius equals 274.15 K. The temperature formulas are exact; only the digits shown are rounded.

Celsius to Kelvin conversion table

Where degrees Celsius and kelvin are used

Celsius is the everyday temperature scale in almost every country: weather, cooking, health and science.

Kelvin is the scientific temperature scale, starting at absolute zero, used in physics, chemistry and astronomy.

Worked examples

These examples use the formula above, so you can check the converter or do the same by hand:

• -40 °C = 233.15 K
• 20 °C = 293.15 K
• 100 °C = 373.15 K

Converting degrees Celsius to kelvin in your head

As a quick estimate, multiply by 274 (rounded).

Kelvin to Celsius reference table

For the opposite direction, these values are handy to have at hand:

Common mistakes to avoid

• Temperature scales have different zero points, so you cannot simply multiply: you must add or subtract an offset as well.
• A difference of 1 °C equals a difference of 1.8 °F, but 0 °C is 32 °F, not 0 °F.

About this converter

The converter accepts whole numbers, decimals and negative values, gives the result as you type, and uses full precision internally, so what you copy is as accurate as it can be. It runs in your browser: nothing you type is sent to a server, it keeps working offline once the page has loaded, and there is nothing to install.

Need the opposite direction? Use the Kelvin to Celsius converter.