How do I convert Celsius to Kelvin?

Add 273.15 to the Celsius temperature. Formula: K = C + 273.15. Examples: 0C = 273.15K, 25C = 298.15K, 100C = 373.15K, -273.15C = 0K (absolute zero).

What is 0 Celsius in Kelvin?

0 Celsius = 273.15 Kelvin. Water freezes at 273.15K and boils at 373.15K. The Kelvin scale is offset from Celsius by exactly 273.15 degrees.

Is Kelvin ever negative?

No. Kelvin is an absolute temperature scale starting at 0K (absolute zero). Negative Kelvin is undefined in classical thermodynamics. However, in quantum systems, physicists have created states described as negative Kelvin that are actually hotter than any positive temperature, though this is a special use of the term.

Why is Kelvin used in science instead of Celsius?

Kelvin is used in science because it starts at absolute zero, making temperature ratios meaningful. In Kelvin, if you double the temperature you truly double the thermal energy. Gas laws (like the Ideal Gas Law PV=nRT) require absolute temperature in Kelvin.

Celsius to Kelvin (°C to K) Converter

Also try: °C to °F | K to °C

Celsius to Kelvin — Formula & Reference

Kelvin (K) is the SI base unit of temperature, used primarily in science and engineering. 0 K is absolute zero, the lowest theoretically possible temperature. The conversion from Celsius is simply an offset.

Formula

K = °C + 273.15

Reference Values

°C	K	Reference
−273.15	0	Absolute zero
0	273.15	Freezing point of water
20	293.15	Room temperature
100	373.15	Boiling point of water

Related Temperature Converters

°C → °F °F → °C K → °C KG → LBS L → gal

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Celsius to Kelvin (°C to K) Converter

Celsius to Kelvin — Formula & Reference

Formula

Reference Values

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