Celsius to Kelvin

Easily convert temperatures from degrees Celsius to Kelvin for scientific calculations or everyday use.

Educational purposes only. Not professional advice.

Examples

  • 0 °C ⇒ 273.15 K
  • 25 °C ⇒ 298.15 K
  • -10 °C ⇒ 263.15 K

FAQ

Can it handle negative temperatures?

Yes, input any Celsius value including negatives.

Are decimals supported?

Yes, you can enter decimal temperatures.

What is absolute zero in Kelvin?

Absolute zero is 0 K, equal to -273.15 °C.

Why add 273.15?

The Kelvin scale starts at absolute zero, 273.15 degrees below 0 °C.

Additional Information

  • Kelvin is the SI base unit for temperature.
  • Unlike Celsius, Kelvin values do not use the degree symbol.
  • Explore the [degree Celsius guide](/units-and-measures/degree-celsius-definition-history-and-applications/) to keep offset conversions grounded in SI history.

Related calculators

Tie conversions to the kelvin definition

After converting, read the kelvin base unit guide to see how the Boltzmann constant anchors absolute temperature and how ISO 80000-5 formalises the notation you use here.