Celsius to Kelvin Converter (°C to K)
1 celsius = 274.15 kelvin. The kelvin is the SI unit of temperature and uses the same step size as Celsius, so converting only requires adding 273.15.
Result
25 °C = 298.15 K
How to convert celsius to kelvin
The kelvin is the SI unit of temperature and uses the same step size as Celsius, so converting only requires adding 273.15. 0 K is absolute zero, the lowest possible temperature, at -273.15 C.
Formula
K = °C + 273.15
Worked example
25 °C = 298.15 K
Celsius to Kelvin quick-reference table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 °C | 0 K |
| -40 °C | 233.15 K |
| 0 °C | 273.15 K |
| 20 °C | 293.15 K |
| 37 °C | 310.15 K |
| 100 °C | 373.15 K |
Real-life examples
Science and engineering: room temperature of 25 C is 298.15 K, water boils at 373.15 K (100 C) and liquid nitrogen at about 77 K (-196 C).
Frequently asked questions
How do I convert Celsius to Kelvin?
Add 273.15 to the Celsius value: 0 C = 273.15 K.
Is it "degrees Kelvin"?
No. Since 1967 the unit is simply "kelvin" (K), without the word degree.
What is 1 celsius in kelvin?
1 celsius = 274.15 kelvin (°C to K).
What is the formula to convert °C to K?
K = °C + 273.15. For example, 25 °C = 298.15 K.
How do I convert K back to °C?
Use the reverse converter: 1 kelvin = -272.15 celsius. Check: 298.15 K converts back to 25 °C.
Reverse conversion
Need the other direction? Kelvin to Celsius converter (K to °C): 1 kelvin = -272.15 celsius.
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