To convert Celsius to Kelvin, use K = °C + 273.15. For example, 20 °C equals 293.15 K. Enter any value above and the result appears instantly — free and entirely in your browser, with nothing uploaded.
How do you convert Celsius to Kelvin?
The conversion formula is K = °C + 273.15. The two scales have different zero points and step sizes, so you shift as well as scale.
Celsius to Kelvin conversion table
| °C | K |
|---|---|
| 0 °C | 273.15 K |
| 10 °C | 283.15 K |
| 20 °C | 293.15 K |
| 37 °C | 310.15 K |
| 100 °C | 373.15 K |
What is Celsius (°C)?
Degrees Celsius (°C) is the everyday metric temperature scale: water freezes at 0 °C and boils at 100 °C at sea level. It is used almost everywhere except the United States.
What is Kelvin (K)?
The kelvin (K) is the SI base unit of temperature. It starts at absolute zero (0 K = −273.15 °C), the point where molecular motion stops, and is used throughout science.
Why convert Celsius to Kelvin?
Celsius is standard in most of the world, Fahrenheit dominates in the United States, and kelvin is the scientific scale. Recipes, weather and travel constantly require switching between them.
By international definition, water freezes at 0 °C (32 °F, 273.15 K) and boils at 100 °C (212 °F) at standard atmospheric pressure (NIST). Normal human body temperature is about 37 °C (98.6 °F).
How to convert Celsius to Kelvin
- Enter the value in Celsius into the left field of the converter.
- Read the result in Kelvin instantly in the right field — it updates automatically.
- Use the swap button to reverse the direction (Kelvin to Celsius).
The converter runs entirely in your browser: no uploads, no queue, no limits. You can even use it offline.