Celsius to Kelvin

Convert Celsius to Kelvin

Use the Celsius to Kelvin converter to express a temperature reading on another scale. Enter the source temperature and read the result with its unit. This conversion changes the scale used to report the temperature, not the temperature of the object itself.

Exact conversion formula

K = °C + 273.15. Add 273.15 without changing the size of the temperature step. Kelvin is written K, without a degree sign.

Worked examples

0°C equals 273.15 K; 25°C equals 298.15 K. Use these values to check that you have selected the correct conversion direction. These are scale-conversion examples rather than claims about a particular material or measurement condition.

Temperature readings and temperature changes

A temperature reading and a temperature difference require different calculations. Offsets apply to readings, not to differences. A rise of 1°C equals a rise of 1 K or 1.8°F. Do not add 273.15 or 32 when converting a difference alone.

Frequently asked questions

What is the lower limit?

For ordinary thermodynamic temperatures, absolute zero is 0 K, equivalent to -273.15°C or -459.67°F. This calculator performs the arithmetic conversion without enforcing that physical minimum. Check values below absolute zero before treating them as physical measurements.

How many decimal places should I keep?

The displayed result is formatted to two decimal places. For further calculations, retain enough intermediate digits and round only the final answer. A conversion does not make the original thermometer or sensor more accurate.

Related converters

Unit converter tools | Kelvin to Celsius | Celsius to Fahrenheit | Fahrenheit to Celsius