Celsius to Kelvin Converter (°C to K)

How to use this calculator: celsius to kelvin

1. 1Enter the value measured in celsius (°C).
2. 2Confirm the direction is Celsius (°C) to Kelvin (K); reversing the units changes the factor or offset.
3. 3Apply K = °C + 273.15. The live converter performs this substitution as you type.
4. 4Read the answer in K and keep only justified precision.

Conversion formula

Kelvin uses the same degree size as Celsius but starts at absolute zero, so converting only means adding 273.15. It is the standard temperature unit in physics, thermodynamics and PV cell modelling.

Temperature scales use different degree sizes and zero points, so the equation needs a multiplier and an offset. Check 0 °C = 273.15 K.

Worked conversion example: Celsius to Kelvin

1. Given: 10 °C
2. Substitute: K = 10 + 273.15
3. Result: 10 °C = 283.15 K

Accuracy checklist

The converter keeps extra precision internally. Report only the precision supported by the original measurement and follow the required rounding rule.

Direction check: a smaller unit usually gives a larger number; temperature is an exception.

Unit definitions and SI traceability: NIST Office of Weights and Measures — SI Units.