Convert Kelvin to Celsius – Temperature Converter

Kelvin is the SI base unit for thermodynamic temperature. Celsius is a derived scale offset from Kelvin. The conversion is performed by subtracting a fixed offset: Celsius equals Kelvin minus 273.15.

The numerical conversion itself is exact and not approximated. Measurement-related uncertainty comes from instruments and procedures. For laboratory and regulatory contexts, follow recognized standards for temperature measurement and calibration such as the International Temperature Scale (ITS-90) and laboratory accreditation standards.

For safety or regulatory use (for example workplace heat guidance), verify sensor calibration, measurement placement, and applicable thresholds in the relevant standards or legal guidance rather than relying solely on a single converted reading.

Subtract 273.15 from a kelvin temperature to get degrees Celsius. The arithmetic conversion is exact; measurement uncertainty depends on instruments and procedures.

For calibrated, regulatory, or safety-critical applications, pair this numerical conversion with appropriate calibration records, uncertainty estimates, and adherence to relevant standards.

0 K → 0 − 273.15 = −273.15 °C (absolute zero in Celsius)

273.15 K → 273.15 − 273.15 = 0 °C (freezing point of pure water at standard pressure)

310.15 K → 310.15 − 273.15 = 37 °C (approximate human body temperature)