Fahrenheit to Celsius Converter
Convert fahrenheit to celsius online. 100 °F = 37.777778 °C. Free, instant Fahrenheit-to-Celsius converter. Works both ways with a formula and reference table.
Fahrenheit → Celsius
1 °F = -17.222222 °C
Fahrenheit to Celsius conversion table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| 1 °F | -17.222222 °C |
| 2 °F | -16.666667 °C |
| 5 °F | -15 °C |
| 10 °F | -12.222222 °C |
| 25 °F | -3.888889 °C |
| 50 °F | 10 °C |
| 100 °F | 37.777778 °C |
- Instant, live Fahrenheit ↔ Celsius conversion
- Accurate to the exact formula
- Converts in both directions
- Reference table of common values
- 100% private — runs entirely in your browser
- Free, no sign-up, works offline
How to use the Fahrenheit to Celsius Converter
- 1
Type the number of fahrenheit in the first box.
- 2
Read the equivalent value in celsius instantly in the second box.
- 3
Or type a Celsius value to convert back to fahrenheit — it works both ways.
- 4
Copy the result, or check the reference table for common conversions.
About the Fahrenheit to Celsius Converter
The ByteTools Fahrenheit to Celsius Converter turns any Fahrenheit temperature into Celsius instantly using the standard conversion formula, °C = (°F − 32) × 5/9. Type a value and the result updates live, with the formula and a quick reference table shown below.
Temperature conversions are essential for weather, cooking, science and travel between countries that use Celsius and Fahrenheit. Everything is calculated locally in your browser — nothing is uploaded — so it is fast, private and works offline. Enter a number in either box to convert both ways, and use the table for common Fahrenheit-to-Celsius values at a glance.
Frequently asked questions
What is the formula to convert Fahrenheit to Celsius?
Use °C = (°F − 32) × 5/9. Enter any Fahrenheit value and this tool applies the formula instantly. For example, 100 °F equals 37.777778 °C.
What is 0 °F in Celsius?
Zero °F equals -17.777778 °C. Temperature scales have different zero points, so the conversion is an offset formula rather than a simple multiplication.
How do I convert Celsius back to Fahrenheit?
Apply the inverse formula, or simply use our Celsius to Fahrenheit converter for the reverse direction. Both pages share the same exact conversion so the numbers always match.
Is this Fahrenheit to Celsius converter free and private?
Yes. The conversion runs entirely in your browser with JavaScript — nothing you type is uploaded, logged or stored. It is completely free, needs no sign-up and keeps working offline once loaded.