Degrees Fahrenheit to degrees Celsius
1 degree Fahrenheit = -17.2222 degrees Celsius
Type a value in degrees Fahrenheit (°F) to get degrees Celsius (°C) straight away. Both units belong to temperature, measured here against the kelvin.
1 °F = -17.222222 °C
Formula
°C = (°F − 32) × 5/9
Subtract 32 to move the freezing point to zero, then multiply by 5/9 because a Celsius degree is 1.8 times larger. Here °F is the value in degrees Fahrenheit and °C is the result in degrees Celsius.
Worked example: 98.6 degrees Fahrenheit: put 98.6 into °C = (°F − 32) × 5/9. The result is 37 degrees Celsius.
Degrees Fahrenheit to degrees Celsius table
| degrees Fahrenheit (°F) | degrees Celsius (°C) |
|---|---|
| -40 °F | -40 °C |
| -20 °F | -28.8889 °C |
| -10 °F | -23.3333 °C |
| 0 °F | -17.7778 °C |
| 10 °F | -12.2222 °C |
| 15 °F | -9.44444 °C |
| 20 °F | -6.66667 °C |
| 25 °F | -3.88889 °C |
| 30 °F | -1.11111 °C |
| 35 °F | 1.66667 °C |
| 37 °F | 2.77778 °C |
| 40 °F | 4.44444 °C |
| 50 °F | 10 °C |
| 60 °F | 15.5556 °C |
| 70 °F | 21.1111 °C |
| 80 °F | 26.6667 °C |
| 90 °F | 32.2222 °C |
| 100 °F | 37.7778 °C |
Everyday degrees Fahrenheit in degrees Celsius
| What it is | °F | °C |
|---|---|---|
| a home freezer (about) | 0 °F | -17.7778 °C |
| a fridge | 40 °F | 4.44444 °C |
| room temperature | 68 °F | 20 °C |
| body temperature | 98.6 °F | 37 °C |
| a moderate oven | 350 °F | 176.667 °C |
Quick estimate in your head
Subtract 30 and halve. At 68 °F that gives 19 °C against an exact 20 °C; the error grows away from 50 °F.
Watch out for
- For a temperature change (not a reading), use only the 1.8 factor: a rise of 10 °C is a rise of 18 °F, not 50 °F.
- Do not add 32 when converting a temperature difference; use only the 9/5 factor.
About the units
Degree Fahrenheit (°F). Water freezes at 32 °F and boils at 212 °F. Used for weather and cooking in the US.
Degree Celsius (°C). Water freezes at 0 °C and boils at 100 °C at sea level. Used for weather almost everywhere.
Going the other way, 1 degree Celsius is 33.8 degrees Fahrenheit.
Questions
How many degrees Celsius are in 1 degree Fahrenheit?
1 degree Fahrenheit is -17.2222 degrees Celsius, and 1 degree Celsius is 33.8 degrees Fahrenheit.
How do I convert degrees Fahrenheit to degrees Celsius?
Use °C = (°F − 32) × 5/9. For example, 98.6 degrees Fahrenheit: put 98.6 into °C = (°F − 32) × 5/9. The result is 37 degrees Celsius.
At what temperature are Celsius and Fahrenheit equal?
At −40. −40 °C is exactly −40 °F, which is a quick way to check a formula.
How much is a moderate oven in degrees Celsius?
350 °F is 176.667 °C.
Source for the conversion factor: BIPM SI Brochure (kelvin and degree Celsius).
Related conversions
- degrees Celsius to degrees Fahrenheit
- degrees Celsius to kelvins
- kelvins to degrees Celsius
- degrees Fahrenheit to kelvins
- kelvins to degrees Fahrenheit