In 1 celsius there are 274.15 kelvin. Meanwhile in 1 kelvin there are -272.15 celsius. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Kelvin to Celsius calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert Celsius to Kelvin, add 273.15 to the Celsius value.
Formula: K = °C + 273.15
Examples:
0°C = 273.15 K25°C = 298.15 K-273.15°C = 0 KUse Kelvin in science for thermodynamics, gas laws, and lab work where absolute temperature matters.
Use this formula: K = °C + 273.15.
Add 273.15 to the Celsius value to get Kelvin.
Use this formula: °C = K - 273.15.
Subtract 273.15 from the Kelvin value to get Celsius.
Kelvin and Celsius use the same size degree. They just start at different zero points.
0 K is absolute zero, which equals -273.15 °C. That offset is why you add 273.15.
Absolute zero is the lowest possible temperature.
It equals 0 K and -273.15 °C.
No. Write K, not °K.
Celsius uses the degree symbol: °C.
Here are a few quick conversions:
No. Kelvin can’t go below 0 K.
A negative Kelvin value isn’t used in standard temperature work.
Yes. A change of 1 °C equals a change of 1 K.
Example: from 20 °C to 25 °C is a 5 °C change, which is also 5 K.
Kelvin is used in many science settings, such as physics and chemistry.
It works well for gas laws and heat formulas because it starts at absolute zero.
Add 273 for a close estimate, then adjust by 0.15 if needed.
Example: 20 °C is about 293 K, and the exact value is 293.15 K.
It depends on your needs.
For most school work, 273.15 is best. For quick estimates, rounding to 273 is often fine.
0 K = -273.15 °C.
That value marks absolute zero.
The Calculate Box tool to convert celsius to kelvin uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a celsius value in the box and have it instantly converted to kelvin.