How to use (3 steps)
- Pick the source scale (Celsius, Fahrenheit, or Kelvin).
- Enter a temperature value (you can also use the up/down arrow keys) and choose the target scale.
- Check the result and formula below, then copy the result URL if you want to reopen or share the same conversion later.
All calculations run only in your browser; the values you enter are not sent to any server.
FAQ
How do you convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32. Example: 25°C → (25 × 9/5) + 32 = 77°F.
Can Kelvin be negative?
No. Temperatures below absolute zero do not exist, so the converter blocks values under 0 K.