Fahrenheit to Celsius Converter
Convert fahrenheit to celsius instantly. Formula, worked steps and a full reference table.
How to use it
- Type the value in fahrenheit — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 0 °F | -17.77777778 °C |
| 10 °F | -12.22222222 °C |
| 25 °F | -3.888888889 °C |
| 37 °F | 2.777777778 °C |
| 100 °F | 37.77777778 °C |
Fahrenheit and Celsius are both temperature scales, but they do not share a zero point, so converting between them means shifting as well as scaling. That is why you cannot simply multiply by a single factor the way you can with length or weight.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
Fahrenheit and Celsius compared
Fahrenheit (°F) — Fahrenheit puts water's freezing point at 32 and its boiling point at 212, giving 180 degrees between them. Everyday temperature in the United States.
Celsius (°C) — Celsius sets 0 at the freezing point of water and 100 at its boiling point at sea level. Everyday temperature in almost every country, and all scientific work.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many °C are in 1 °F?
This conversion uses a nonlinear formula. For example, 1 °F = -17.22222222 °C.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026