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Celsius to Kelvin

Convert Celsius (°C) to Kelvin (K) — instant and accurate

0 °C = 273.15 K  ·  100 °C = 373.15 K

274.15 K

Celsius to Kelvin Conversion Table

CelsiusKelvin
-40 °C233.15 K
-20 °C253.15 K
-10 °C263.15 K
0 °C273.15 K
10 °C283.15 K
20 °C293.15 K
25 °C298.15 K
30 °C303.15 K
37 °C310.15 K
50 °C323.15 K
75 °C348.15 K
100 °C373.15 K
150 °C423.15 K
200 °C473.15 K
250 °C523.15 K
500 °C773.15 K
1000 °C1273.15 K

Formula

K = C + 273.15
C = K − 273.15
Example: 100 °C = 373.15 K

About the Celsius-to-Kelvin Conversion

Converting Celsius to Kelvin is the standard scientific conversion — used in physics, chemistry, and engineering. The two scales have the same step size; only the zero point differs. Add 273.15 to a Celsius value to get the Kelvin equivalent.

Real-World Examples

  • 0 °C (water freezing) = 273.15 K
  • 100 °C (water boiling) = 373.15 K
  • -273.15 °C (absolute zero) = 0 K
  • 25 °C (room temperature) = 298.15 K

Kelvin to Celsius (Reverse)

KelvinCelsius
-40 K-313.15 °C
-20 K-293.15 °C
-10 K-283.15 °C
0 K-273.15 °C
10 K-263.15 °C
20 K-253.15 °C
25 K-248.15 °C
30 K-243.15 °C
37 K-236.15 °C
50 K-223.15 °C
75 K-198.15 °C
100 K-173.15 °C
150 K-123.15 °C
200 K-73.15 °C
250 K-23.15 °C
500 K226.85 °C
1000 K726.85 °C

Frequently Asked Questions

What is the formula to convert Celsius to Kelvin?

K = C + 273.15

What is 0 °C in Kelvin?

0 °C equals 273.15 K.

What is 100 °C in Kelvin?

100 °C equals 373.15 K.

How do I convert Kelvin back to Celsius?

C = K − 273.15

What is 25 °C in Kelvin?

25 °C (room temperature) equals 298.15 K.

Is the Celsius-to-Kelvin conversion exact?

Yes. The conversion between Celsius and Kelvin is defined exactly by international agreement.

About Celsius and Kelvin

The degree Celsius (symbol °C) is the everyday temperature scale used in most of the world. Water freezes at 0 °C and boils at 100 °C at standard atmospheric pressure.

The kelvin (symbol K, with no degree sign) is the SI base unit of thermodynamic temperature. 0 K is absolute zero; one kelvin equals one degree Celsius in size.

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