Use this free online Celsius to Kelvin converter to quickly convert °C to K. Simply enter the temperature in Celsius, and the tool will instantly display the equivalent in Kelvin.
| Celsius | Kelvin |
|---|
Formula: K = °C + 273.15
How to Convert Celsius to Kelvin
Converting °C to K only requires an offset, since both scales use the same size of degree — only their zero points differ. To convert, add 273.15 to the Celsius value.
Formula: K = °C + 273.15
Example: Convert 25°C to K. 25 + 273.15 = 298.15 K So, 25°C is equal to 298.15 K.
What is Celsius?
Celsius (°C), also known as centigrade, is a temperature scale where water freezes at 0°C and boils at 100°C at standard atmospheric pressure. It is the standard temperature unit used in most countries around the world.
What is Kelvin?
Kelvin (K) is the SI base unit of temperature, used mainly in science and engineering. Unlike Celsius and Fahrenheit, Kelvin has no negative values — 0 K represents absolute zero, the point at which all molecular motion theoretically stops. Note that Kelvin is written without a degree symbol.
Celsius to Kelvin Relationship
K = °C + 273.15 °C = K − 273.15
Since both scales share the same degree size, the conversion is a simple addition or subtraction, with no multiplication involved.
°C to K Conversion Table
| Celsius (°C) | Kelvin (K) |
|---|---|
| −273.15°C | 0 K |
| 0°C | 273.15 K |
| 20°C | 293.15 K |
| 25°C | 298.15 K |
| 37°C | 310.15 K |
| 100°C | 373.15 K |
| 500°C | 773.15 K |
Solved Examples
Example 1: Convert 30°C to K. 30 + 273.15 = 303.15 K
Example 2: Convert −10°C to K. −10 + 273.15 = 263.15 K
Example 3: What is absolute zero in °C? 0 K equals −273.15°C, the coldest possible temperature.
Frequently Asked Questions
Add 273.15 to the Celsius value to get the equivalent in Kelvin.
Yes, a change of 1°C equals a change of 1 K, since both scales use the same degree size.
Kelvin is used mainly in scientific and engineering contexts, such as physics, chemistry, and astronomy, where absolute temperature values are required.