Convert Fahrenheit to Celsius
Convert Fahrenheit to Celsius instantly. Formula, worked examples and a full reference table from -40° upward.
Last updated
Converting Fahrenheit to Celsius is not a simple multiplication, because the two scales have different zero points as well as different degree sizes. The conversion needs both a scaling step and an offset.
Enter any temperature above and the result updates as you type. The formula and a reference table covering everyday temperatures follow below.
Fahrenheit to Celsius formula
To go the other way, use °F = (°C × 9/5) + 32.
About these units
Fahrenheit puts water's freezing and boiling points at 32 and 212, giving 180 degrees between them. A Fahrenheit degree is therefore smaller than a Celsius one.
The Celsius scale sets zero at the freezing point of water and 100 at its boiling point, both at standard atmospheric pressure.
Fahrenheit to Celsius conversion table
| Fahrenheit | Celsius |
|---|---|
| -40 °F | -40 °C |
| -20 °F | -28.8889 °C |
| -10 °F | -23.3333 °C |
| 0 °F | -17.7778 °C |
| 10 °F | -12.2222 °C |
| 20 °F | -6.6667 °C |
| 25 °F | -3.8889 °C |
| 30 °F | -1.1111 °C |
| 37 °F | 2.7778 °C |
| 40 °F | 4.4444 °C |
| 50 °F | 10 °C |
| 100 °F | 37.7778 °C |
Frequently asked questions
How many celsiuss are in a fahrenheit? +
Temperature scales cannot be compared this way, because they do not share a zero point. Use the formula °C = (°F − 32) × 5/9 instead.
What is 25 °F in °C? +
25 °F equals -3.8889 °C. Apply the formula °C = (°F − 32) × 5/9.
How do I convert celsius back to fahrenheit? +
Use °F = (°C × 9/5) + 32. The converter above handles both directions, or see our dedicated Celsius to Fahrenheit page.