Unit Converter
Celsius to Kelvin Converter
Convert Celsius (°C) to Kelvin (K) instantly. Free, accurate, and browser-based — no signup, no ads in your way.
Instant resultExact formula shownConversion table included
Result-40 °C = 233.15 K
How to convert Celsius to Kelvin
K = °C + 273.15. Add 273.15 to the Celsius temperature to get Kelvin.
Example: 37 °C = 310.15 K.
Celsius to Kelvin conversion table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -40 | 233.15 |
| -30 | 243.15 |
| -20 | 253.15 |
| -10 | 263.15 |
| 0 | 273.15 |
| 5 | 278.15 |
| 10 | 283.15 |
| 15 | 288.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 30 | 303.15 |
| 35 | 308.15 |
| 37 | 310.15 |
| 40 | 313.15 |
| 50 | 323.15 |
| 60 | 333.15 |
| 80 | 353.15 |
| 100 | 373.15 |
| 180 | 453.15 |
| 200 | 473.15 |
Convert the other way
Need K to °C instead? Use the dedicated Kelvin to Celsius converter.
FAQ
How do I convert Celsius to Kelvin?
K = °C + 273.15. Add 273.15 to the Celsius temperature to get Kelvin.
What is 25 °C in K?
25 Celsius equals 298.15 Kelvin. Type any value into the converter above for an instant exact result.
Is this °C to K converter free?
Yes. Every Utiliora tool is free, open source, works in your browser, and never asks you to sign up.
Can I convert the other way, from K to °C?
Yes — use the Kelvin to Celsius converter at /converters/kelvin-to-celsius, or press the swap button in the converter above.