Fahrenheit to Celsius
C = (F - 32) * 5/9
Converter Calculator
1 Fahrenheit (°F) = -17.222222 Celsius (°C)
Explanation
Use the exact affine transform: subtract 32 from Fahrenheit, then multiply by 5/9.
Common Conversion Values
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 | -40 |
| -20 | -28.888889 |
| 0 | -17.777778 |
| 20 | -6.666667 |
| 32 | 0 |
| 37 | 2.777778 |
| 50 | 10 |
| 100 | 37.777778 |
| 212 | 100 |
How to use this hub
- Choose a converter family.
- If converting to/from grams from a volume unit, select an ingredient.
- For pure unit changes (volume↔volume or weight↔weight), use universal conversions.
If your conversion includes grams, you’ll choose an ingredient; otherwise you won’t.
Frequently Asked Questions
What formula does this page use?
This page uses the exact formula: C = (F - 32) * 5/9.
How do I switch to the reverse conversion?
Use Switch Units to open the mirror page. The current input value is carried into that page.
Can I enter negative values?
Yes. Negative inputs are supported for Celsius and Fahrenheit scenarios and to inspect the formula output directly.