Celsius to Kelvin Converter
Convert Celsius to kelvin instantly — the first step of every thermodynamics numerical.
Formula used
How to use this converter
- Type the temperature in the first box.
- Choose the starting scale and the target scale.
- The converted temperature shows right away.
The formula
Just add: K = °C + 273.15. Example: 25 °C + 273.15 = 298.15 K. It is the easiest temperature conversion there is.
Quick conversion table
| Celsius | Kelvin | Note |
|---|---|---|
| −273.15 °C | 0 K | Absolute zero |
| 0 °C | 273.15 K | Water freezes |
| 25 °C | 298.15 K | Room temperature |
| 37 °C | 310.15 K | Body temperature |
| 100 °C | 373.15 K | Water boils |
Board exam essential
CBSE and state board physics papers love asking for temperatures in kelvin — gas law numericals in Class 11 basically require it. The common student mistake is adding 273 instead of 273.15; in board exams, the .15 can matter. This tool never forgets it.
Frequently asked questions
How do you convert celsius to kelvin?
Add 273.15: K = °C + 273.15.
What is 25°C in kelvin?
298.15 K.
Is it 273 or 273.15?
Exactly 273.15 — using 273 is an approximation teachers accept roughly, but 273.15 is correct.
What is −273.15°C in kelvin?
0 K — absolute zero.