How do I convert Kelvin to Celsius?

To convert Kelvin (K) to Celsius (°C), use the formula: °C = K − 273.15. For example, 1 K equals -272.15 °C.

How many °C are in one K?

There are -272.15 celsius in one kelvin (1 K = -272.15 °C).

What is the conversion formula for K to °C?

The exact conversion formula is: °C = K − 273.15. This converter uses this formula to give you an accurate result for any value you enter.

What is 0 Kelvin in Celsius?

0 K is absolute zero, the lowest possible temperature, equal to −273.15 °C. Nothing can be colder, which is why the Kelvin scale starts there rather than at the freezing point of water.

What is room temperature in Kelvin?

A comfortable room temperature of about 20 °C is 293.15 K. To convert, add 273.15 to the Celsius value.

Why is there no degree symbol on Kelvin?

Kelvin is an SI base unit, so temperatures are written as '300 K', not '300 °K'. Celsius keeps the degree symbol (°C). The size of one kelvin and one degree Celsius is identical — only the zero point differs by 273.15.

Kelvin to Celsius Converter

This free temperature converter changes Kelvin (K) into Celsius (°C) and back again. Kelvin is the SI base unit of temperature, used in science and engineering, while Celsius is the everyday scale for weather and cooking. Because the two scales share the same step size, only an offset separates them.

How it works

The converter subtracts the fixed offset: °C = K − 273.15. To go the other way it adds 273.15: K = °C + 273.15. This is an additive (not proportional) relationship, so a change of 1 K always equals a change of 1 °C. The reference point is absolute zero, which sits at 0 K = −273.15 °C. Both fields are linked and update instantly as you type.

Example

To convert 300 K to Celsius, subtract 273.15:

300 − 273.15 = 26.85 °C

So 300 K is about 26.85 °C — a warm room. Likewise, the human body temperature of 310.15 K equals exactly 37 °C.

Kelvin (K)	Celsius (°C)
0 K	-273.15 °C
273.15 K	0 °C
310.15 K	37 °C
373.15 K	100 °C

All calculations run entirely in your browser — no data is sent to any server.