How to convert degrees Celsius to kelvin
K = °C + 273.15
Example: 25 °C → 298.15 K
Temperature scales have different zero points, so you cannot convert them with a single multiplication factor.
Celsius to Kelvin table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -40 °C | 233.15 K |
| -20 °C | 253.15 K |
| -10 °C | 263.15 K |
| 0 °C | 273.15 K |
| 10 °C | 283.15 K |
| 15 °C | 288.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 30 °C | 303.15 K |
| 35 °C | 308.15 K |
| 37 °C | 310.15 K |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 60 °C | 333.15 K |
| 80 °C | 353.15 K |
| 100 °C | 373.15 K |
| 150 °C | 423.15 K |
| 200 °C | 473.15 K |
About these units
Celsius (°C): Celsius (°C) sets 0° at the freezing point and about 100° at the boiling point of water at sea level. It is used for weather in almost every country.
Kelvin (K): The kelvin (K) is the SI unit of temperature. It starts at absolute zero (0 K = −273.15 °C) and uses the same step size as Celsius.
Frequently asked questions
How do you convert degrees Celsius to kelvin?
To convert degrees Celsius to kelvin, use K = °C + 273.15. For example, 25 °C = 298.15 K.
How do I convert °C to K?
Use the formula K = °C + 273.15. For example, 25 °C gives 298.15 K.
How do I convert kelvin back to degrees Celsius?
Use the reverse formula on our Kelvin to Celsius page, or press Swap in the converter above.
What is the Celsius scale?
Celsius (°C) sets 0° at the freezing point and about 100° at the boiling point of water at sea level. It is used for weather in almost every country.
Conversion factors come from exact international definitions (NIST SP 811, BIPM) where they exist. Results show up to 10 significant digits. Need every temperature unit at once? Use the Temperature Converter.