Celsius to Kelvin Converter
Convert Celsius to kelvins and back, instantly.
Move between Celsius and the absolute scale
Celsius and Kelvin have equal-size increments, but their zero points differ by exactly 273.15. Kelvin begins at absolute zero and is widely used in science. Conversion therefore adds or subtracts the fixed offset without changing the size of each temperature interval.
The default 0 degrees Celsius converts to exactly 273.15 kelvins, while 25 degrees Celsius converts to 298.15 kelvins. Reversing 273.15 kelvins returns exactly 0 degrees Celsius. Kelvin values are written without a degree symbol.
Local scientific conversion
The number stays in your browser and is not sent to a laboratory, weather, or analytics service. This tool does not validate whether an entered Kelvin value is physically possible, measure temperature, or estimate uncertainty. It applies only the exact scale offset.
Frequently Asked Questions
What is zero Celsius in kelvins?
Zero degrees Celsius equals exactly 273.15 kelvins.
Does Kelvin use a degree symbol?
No. The SI unit name is kelvin and its symbol is K without a degree sign.
Where is absolute zero on the Celsius scale?
Absolute zero is zero kelvins, equal to minus 273.15 degrees Celsius.
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