This degrees Fahrenheit to degrees Celsius converter turns any °F reading into °C instantly, in your browser, with the formula shown so you can check the result by hand. Degrees Fahrenheit are a US customary unit; degrees Celsius are part of the metric system used in most countries. Water freezes at 32 °F (0 °C) and boils at 212 °F (100 °C) at sea level.
The formula is °C = (°F − 32) × 5/9. For a quick mental estimate between Celsius and Fahrenheit, double the Celsius value and add 30; it is within a few degrees for everyday temperatures. Normal body temperature is 98.6 °F, which is 37 °C.
°F to °C formula
°C = (°F − 32) × 5/9
Degrees Fahrenheit to Degrees Celsius conversion table
| degrees Fahrenheit | degrees Celsius | Rounded |
|---|---|---|
| -40 °F | -40 °C | -40 |
| -30 °F | -34.4444 °C | -34.4 |
| -20 °F | -28.8889 °C | -28.9 |
| -10 °F | -23.3333 °C | -23.3 |
| 0 °F | -17.7778 °C | -17.8 |
| 10 °F | -12.2222 °C | -12.2 |
| 20 °F | -6.66667 °C | -6.67 |
| 25 °F | -3.88889 °C | -3.89 |
| 30 °F | -1.11111 °C | -1.11 |
| 37 °F | 2.77778 °C | 2.78 |
| 40 °F | 4.44444 °C | 4.44 |
| 50 °F | 10 °C | 10 |
| 60 °F | 15.5556 °C | 15.6 |
| 70 °F | 21.1111 °C | 21.1 |
| 80 °F | 26.6667 °C | 26.7 |
| 90 °F | 32.2222 °C | 32.2 |
| 100 °F | 37.7778 °C | 37.8 |
| 150 °F | 65.5556 °C | 65.6 |
| 200 °F | 93.3333 °C | 93.3 |
| 250 °F | 121.111 °C | 121 |
| 300 °F | 148.889 °C | 149 |
| 350 °F | 176.667 °C | 177 |
| 400 °F | 204.444 °C | 204 |
| 450 °F | 232.222 °C | 232 |
Frequently asked questions
How many degrees Celsius are in 20 degrees Fahrenheit?
20 °F = -6.66667 °C. Apply the formula °C = (°F − 32) × 5/9. The converter on this page does the same arithmetic for any value, including decimals.
What is the formula to convert degrees Fahrenheit to degrees Celsius?
°C = (°F − 32) × 5/9. Temperature scales have different zero points, so you cannot simply multiply; the offset matters. Worked example: 100 °F = 37.7778 °C.
Is -10 °F the same as -23.3333 °C?
Yes. -10 °F = -23.3333 °C, a common winter temperature. Notice that -40 is the one point where Celsius and Fahrenheit agree: -40 °C equals -40 °F.
How do I convert degrees Celsius back to degrees Fahrenheit?
Reverse the formula: °F = °C × 9/5 + 32. Or use the degrees Celsius to degrees Fahrenheit page linked above, which has its own table and examples.