Fahrenheit to Celsius Converter
°C = (°F − 32) × 5/9
1 degree Fahrenheit equals -17.2222 degrees Celsius
How to convert Fahrenheit to Celsius
These formulas convert temperature readings. For a temperature difference, use only the scale factor: do not add or subtract the zero-point offset.
°C = (°F − 32) × 5/9The subtraction of 32 aligns the two zero points, then multiplying by 5/9 converts the size of a degree.
20 °C = (68 − 32) × 5/9Fahrenheit to Celsius conversion table
Common values in degrees Fahrenheit, converted to degrees Celsius.
| Degrees Fahrenheit (°F) | Degrees Celsius (°C) |
|---|---|
| -40 | -40 |
| -20 | -28.888889 |
| -10 | -23.333333 |
| 0 | -17.777778 |
| 10 | -12.222222 |
| 20 | -6.6666667 |
| 25 | -3.8888889 |
| 30 | -1.1111111 |
| 37 | 2.7777778 |
| 50 | 10 |
| 100 | 37.777778 |
Frequently asked questions
Is a change of 1 °F the same as a change of 1 °C?
No. A change of 1 °F is a change of 0.555556 °C. Apply only the scale factor to a temperature difference; the offset applies to temperature readings.
About these units
degree Fahrenheit°F
Water freezes at 32 °F and boils at 212 °F at standard atmospheric pressure. The everyday scale in the United States.
degree Celsius°C
Water freezes at 0 °C and boils at 100 °C at standard atmospheric pressure. The everyday scale in most of the world.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.