Fahrenheit to Celsius
Convert Fahrenheit (°F) to Celsius (°C).
Formula and method
result = (value × 0.5555555555555556 + 255.3722222222222 − 273.15) ÷ 1.
Temperature scales use both scale factors and offsets. The conversion applies the source and target offsets through the canonical temperature unit.
Worked examples
These examples use the same conversion engine as the calculator.
- 1 °F-17.22222222 °C
- 5 °F-15 °C
- 10 °F-12.22222222 °C
Common Fahrenheit values
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| 1 | -17.22222222 |
| 2 | -16.66666667 |
| 5 | -15 |
| 10 | -12.22222222 |
| 25 | -3.88888889 |
| 50 | 10 |
| 100 | 37.77777778 |
| 250 | 121.11111111 |
| 500 | 260 |
| 1,000 | 537.77777778 |
How to convert Fahrenheit to Celsius
- Enter a value in Fahrenheit in the converter above.
- The calculator converts it using the catalog’s affine method.
- Choose the decimal precision you need,then copy the displayed result if useful.
Frequently asked questions
What is the formula for Fahrenheit to Celsius?
result = (value × 0.5555555555555556 + 255.3722222222222 − 273.15) ÷ 1. Temperature scales use both scale factors and offsets. The conversion applies the source and target offsets through the canonical temperature unit.
Can I convert Celsius back to Fahrenheit?
Yes. Use Swap Units when the reverse pair is available in the catalog. The page URL changes to the reverse conversion and the entered value is retained.
Why can a value be rejected?
The engine rejects non-finite values and temperatures below absolute zero,while allowing valid negative readings on scales that support them.
How are displayed decimal places chosen?
Use the Decimal precision selector above the result. Very large or very small results switch to scientific notation when that makes the value easier to read.