Temperature Converter (Celsius, Fahrenheit, Kelvin)
Convert a temperature between Celsius, Fahrenheit, and Kelvin. Runs entirely in your browser.
How it works
Unlike length or weight, temperature scales don't share a zero point, so conversion needs an offset, not just a multiplication: Celsius and Kelvin share the same step size (1°C = 1K) but are shifted by 273.15; Fahrenheit both shifts and scales (1°C = 1.8°F of change). Kelvin is an absolute scale — 0 K is absolute zero, so negative Kelvin isn't physically meaningful.
Formulas: °F = °C × 9/5 + 32, K = °C + 273.15.
Common conversions
| From | To | Result |
|---|---|---|
| 0 °C | °F | 32 °F (freezing point of water) |
| 100 °C | °F | 212 °F (boiling point of water) |
| 37 °C | °F | 98.6 °F (average body temperature) |
| 0 K | °C | -273.15 °C (absolute zero) |
FAQ
What temperature is the same in Celsius and Fahrenheit?
-40° — it's the one point where both scales agree.
Why can't Kelvin be negative?
Kelvin measures temperature from absolute zero, the theoretical point where particles have minimum thermal motion — there's nothing colder, so nothing below 0 K.