About this tool
Enter a temperature in Celsius, Fahrenheit or Kelvin and see it in all three scales at once. The conversion uses the exact formulas — °F = °C × 9⁄5 + 32 and K = °C + 273.15 — with no rounding shortcuts.
The three scales anchor differently: Celsius pins 0 and 100 to water's freezing and boiling points at sea level, Fahrenheit sets them at 32 and 212, and Kelvin starts at absolute zero (−273.15 °C), the point of minimum thermal energy, which is why Kelvin has no negative values and no degree symbol.
How to use it
- Type a temperature value.
- Select its scale.
- Read the equivalents in the other two scales.
Frequently asked questions
At what temperature are Celsius and Fahrenheit equal?
−40. It is the single crossover point of the two scales: −40 °C = −40 °F.
Why does Kelvin have no degree sign?
Kelvin is an absolute SI unit measuring thermodynamic temperature from absolute zero, so values are written 300 K, not 300 °K.
What is normal human body temperature?
Around 37 °C / 98.6 °F as the classic average, though healthy individuals typically range between roughly 36.1 and 37.2 °C.