Kelvin to Celsius converter (K to °C)
Convert Kelvin (K) to Celsius (°C) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
Celsius to Kelvin calculation ►
How to convert Kelvin to Celsius
The Kelvin to Celsius formula is T(°C) = T(K) − 273.15. Both scales share the same degree size; only the zero points differ.
T(°C) = T(K) − 273.15
Subtract 273.15 from the Kelvin value:
Example: Convert 0 K (absolute zero) to Celsius:
T(°C) = 0 − 273.15 = −273.15°C
What is a Kelvin?
The kelvin (K) is the SI unit of thermodynamic temperature. Zero kelvin is absolute zero; a kelvin interval equals a Celsius degree.
What is a Celsius?
Celsius (°C) is the metric temperature scale. Water freezes at 0 °C and boils at 100 °C at standard pressure.
This page converts temperature from Kelvin into Celsius. Use the formula above for the exact relationship between the two units.
How this calculator works
The form on this page is a Kelvin-to-Celsius converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the °C result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many °C are in 1 K?
Use the formula in the section above. Temperature and logarithmic units are not a single multiply-by-a-constant step.
How do I convert Kelvin to Celsius?
Subtract 273.15 from the Kelvin value:
Is this K to °C converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.