Fahrenheit to Celsius Converter

About Fahrenheit to Celsius Converter

Temperature conversion is fundamentally different from converting length or weight — it's not a simple multiplication, since Celsius and Fahrenheit use different zero points as well as different scale sizes. Converting between them requires both a scaling factor and an offset, which is why a naive "just multiply" approach produces wrong answers for temperature specifically.

This tool converts between the three temperature scales in common and scientific use: Celsius (used by most of the world for everyday temperature), Fahrenheit (used primarily in the United States), and Kelvin (the scientific standard, used throughout physics and chemistry, where 0 K represents absolute zero — the theoretical coldest possible temperature).

Enter a value in any of the three scales, and the tool converts it into all three simultaneously using the exact standard formulas: Celsius to Fahrenheit multiplies by 9/5 and adds 32; Celsius to Kelvin simply adds 273.15 (since Kelvin uses the same scale size as Celsius, just a different zero point at absolute zero instead of the freezing point of water).

This is useful for understanding a weather forecast from a different country, following a recipe that specifies oven temperature in a scale you're not used to, converting a scientific measurement, or just satisfying curiosity about how a given temperature compares across the different scales.

How it works

1. Enter a temperature value. Any positive or negative number, in whichever scale you have it.
2. Select the input scale. Celsius, Fahrenheit, or Kelvin.
3. View the converted result in all three scales. Calculated instantly using the exact standard formulas.