Kelvin to Celsius

Convert K to °C instantly — with the formula, a table, key reference temperatures, and a live calculator.

100 K equals -173.15 °C.

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Result (°C)-253.15 °C

The formula

To convert K to °C, use: °C = K − 273.15

K to °C table

K°C
0 K-273.15 °C
100 K-173.15 °C
200 K-73.15 °C
250 K-23.15 °C
273.15 K0 °C
293.15 K20 °C
300 K26.85 °C
310.15 K37 °C
373.15 K100 °C

°C to K (reverse)

°CK
-40 °C233.15 K
-20 °C253.15 K
-10 °C263.15 K
0 °C273.15 K
5 °C278.15 K
10 °C283.15 K
20 °C293.15 K
25 °C298.15 K
30 °C303.15 K
37 °C310.15 K
40 °C313.15 K
50 °C323.15 K
100 °C373.15 K

Key temperatures

Reference pointK°C
Absolute zero0 K-273.15 °C
Freezing point of water273.15 K0 °C
Comfortable room294.15 K21 °C
Body temperature310.15 K37 °C
Hot summer day313.15 K40 °C
Boiling point of water373.15 K100 °C

How it scales

-31115293134250288325363400K

Freezing, body & boiling point

K (K)°C (°C)
FreezingBody tempBoiling

Reference points in °C

0Freezing37Body temp100Boiling

Why temperature conversions need an offset

Unlike length or speed, temperature scales have different zero points. Celsius starts at water's freezing point (0 °C), Kelvin at absolute zero (0 K = −273.15 °C), and Fahrenheit at a historical reference (0 °F ≈ −17.8 °C). That is why a single multiplier is not enough — you also need an offset.

Absolute zero is 0 K = −273.15 °C = −459.67 °F — nothing can be colder. For more pairs, use our temperature conversion hub.

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Frequently asked questions

How do I convert K to °C?

Use the formula °C = K − 273.15. For example, 300 K equals 26.85 °C.

What is the formula for K to °C?

The exact conversion formula is: °C = K − 273.15.

What is 373.15 K in °C?

373.15 K equals 100 °C.

What is absolute zero?

Absolute zero is the lowest possible temperature: 0 K = −273.15 °C = −459.67 °F. Nothing can be colder.

Why can't I convert temperatures with a single factor?

Temperature scales have different zero points. Celsius starts at water's freezing point, Kelvin at absolute zero, and Fahrenheit at a historical reference. That is why conversions need an offset, not just a multiplier.

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