Fahrenheit to Celsius Converter
To convert Fahrenheit to Celsius, subtract 32 and then multiply by 5/9. Water freezes at 32 °F, which is 0 °C.
How to Convert Fahrenheit to Celsius
To convert degrees Fahrenheit to degrees Celsius, subtract 32, then multiply by 5/9.
For example: 75 °F − 32 = 43, and 43 × 5/9 = 23.8889 °C.
Where This Comes Up
American weather reports, oven dials, thermostats and body temperatures are all in Fahrenheit. Everyone outside the United States, and every scientific source inside it, reads Celsius.
A 350 °F oven is 176.667 °C, which is why European recipes say 175 °C or gas mark 4.
What People Get Wrong
Temperature differences do not convert the same way as temperatures. A rise of 10 °F is a rise of 5.56 °C, not 10 °F converted to -12.22 °C. For a difference, multiply by 5/9 and skip the subtraction.
Fahrenheit to Celsius Conversion Table
| Degrees Fahrenheit (°F) | Degrees Celsius (°C) |
|---|---|
| -40 | -40 |
| -20 | -28.8889 |
| 0 | -17.7778 |
| 10 | -12.2222 |
| 20 | -6.66667 |
| 32 | 0 |
| 40 | 4.44444 |
| 50 | 10 |
| 60 | 15.5556 |
| 70 | 21.1111 |
| 75 | 23.8889 |
| 80 | 26.6667 |
| 90 | 32.2222 |
| 98.6 | 37 |
| 100 | 37.7778 |
| 110 | 43.3333 |
| 150 | 65.5556 |
| 200 | 93.3333 |
| 212 | 100 |
| 300 | 148.889 |
| 350 | 176.667 |
| 400 | 204.444 |
| 450 | 232.222 |
About These Units
The degree Fahrenheit
On the Fahrenheit scale water freezes at 32 degrees and boils at 212 degrees, so one Fahrenheit degree is 5/9 the size of a Celsius degree. It remains the standard scale for weather, ovens and body temperature in the United States.
The degree Celsius
The Celsius scale puts the freezing point of water at 0 degrees and its boiling point at 100 degrees at sea level. It is the everyday temperature scale in nearly every country except the United States.
Definitions follow The SI Brochure, BIPM. See how we calculate for the exact values and rounding rules.
Frequently Asked Questions
What is the formula for Fahrenheit to Celsius?
Celsius equals (Fahrenheit minus 32) times 5/9. For 70 °F that is 38 times 5/9, or 21.1111 °C.
What is normal body temperature in Celsius?
98.6 °F is exactly 37 °C. The 98.6 figure is itself a conversion of the round 37 °C measured in the 19th century.
At what temperature are Fahrenheit and Celsius the same?
At -40 degrees. -40 °F and -40 °C are the same temperature, which makes it a useful check on any conversion.
Is there a quick mental version?
Subtract 30 and halve it. 70 °F gives 20 °C against the exact 21.1 °C — close enough to dress for the weather.