Kelvin to Celsius Converter

How to convert Kelvin to Celsius

To convert Kelvin to Celsius, subtract 273.15. For example, 300 K = 26.85°C.

Going from Kelvin to Celsius means applying a fixed conversion factor: one Kelvin (K) is exactly -272.15 Celsius (°C). Type any number into the converter above and the equivalent updates instantly, or use the reference table for quick lookups.

Temperature conversions come up constantly in cooking, weather, science, and travel. Unlike most unit conversions, temperature scales don't share a common zero point, which is why the formulas involve both multiplication and addition rather than a single multiplier.

Understanding Kelvin and Celsius

Celsius is used by almost every country for weather and cooking, with water freezing at 0°C and boiling at 100°C at sea level. Fahrenheit remains standard in the United States, placing freezing at 32°F and boiling at 212°F. Kelvin is the scientific standard, starting at absolute zero (−273.15°C), the coldest temperature physically possible, and is used throughout physics and chemistry.

How accurate is this conversion?

Temperature conversions are mathematically exact. The relationship between Celsius and Fahrenheit is fixed (°F = °C × 9/5 + 32), as is the offset between Celsius and Kelvin (K = °C + 273.15). There is no measurement uncertainty in the conversion itself.

All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.

Quick reference: common Kelvin to Celsius values

The most frequently searched conversions are 1 Kelvin = -272.15 Celsius, 5 Kelvin = -268.15 Celsius, 10 Kelvin = -263.15 Celsius, and 100 Kelvin = -173.15 Celsius. The full table further down covers every common value, and the calculator handles any number you need in between.