Convert temperatures from Fahrenheit to Celsius.
Converted value = Source value × Conversion factor
For affine conversions such as temperature, an offset is also applied.The tool applies the relevant factor or temperature offset to the source value. Currency outputs require a current exchange-rate source, while cooking volume-to-weight conversions can vary by ingredient density and measuring method.
The Fahrenheit to Celsius Converter converts temperature from Fahrenheit (°F) to Celsius (°C). Fahrenheit to Celsius formula has an exact relationship to both scales. To convert a temperature from Fahrenheit to Celsius, you take temperature in F, subtract 32 from it, then multiply the value by 5/9.
To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature and then multiply by 5/9.
Fahrenheit → Celsius: (°F − 32) × 5/9
For example, 68°F converts to 20°C:
(68 − 32) × 5/9 = 36 × 5/9 = 20°C
The exact formula for converting Fahrenheit to Celsius is:
°C = (°F − 32) × 5/9
The fraction 5/9 cannot be substituted with an approximation for precise work. Calculator outputs can usually be represented to a reasonable number of decimal figures, depending on the number of figures you require.
Convert 86°F to Celsius.
Starting temperature: 86°F
Subtract 32: 86 − 32 = 54
Multiply by 5/9: 54 × 5/9 = 30
Final result: 86°F = 30°C
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40°F | -40°C |
| -20°F | -28.9°C |
| 0°F | -17.8°C |
| 10°F | -12.2°C |
| 20°F | -6.7°C |
| 30°F | -1.1°C |
| 32°F | 0°C |
| 40°F | 4.4°C |
| 50°F | 10°C |
| 60°F | 15.6°C |
| 68°F | 20°C |
| 70°F | 21.1°C |
| 75°F | 23.9°C |
| 77°F | 25°C |
| 80°F | 26.7°C |
| 86°F | 30°C |
| 90°F | 32.2°C |
| 95°F | 35°C |
| 98.6°F | 37°C |
| 100°F | 37.8°C |
| 104°F | 40°C |
| 120°F | 48.9°C |
| 140°F | 60°C |
| 180°F | 82.2°C |
| 212°F | 100°C |
Some frequently searched temperature conversions include:
This temperature measurement is used mostly in the United States and is based on defining parameters based on the normal freezing and boiling points of water. On the temperature chart, when used in °F, it goes that it boils at 212°F or when it freezes at 32°F with atmospheric pressure considered as being at a standard and level to that of sea-level.
C (Celsius) is a temperature scale used throughout the world and is also the standard scale used in the International System of Units. Water freezes at 0 C and boils at 100 C under normal pressure. C is used in weather, science, cooking and everyday temperature measurement outside of the US.
Fahrenheit and Celsius are based on different origins or reference points and the measure intervals are differently scaled. If we need to switch between these two systems both an offset and a scale change are needed. Multiplying Fahrenheit degrees by 5/9 will be incorrect since before the multiplication step we should have to deduct an offset of 32 degrees.
For example, 32 degrees Fahrenheit would be 0 degrees Celsius exactly, not to be confused with an estimate (at almost 18C - not). This difference (32) the formula accounts for!
This is represented by the formula C = (F 32) 5/9. Subtract 32 from the desired temperature in degrees Fahrenheit and then multiply by 5/9.
32°F is exactly 0°C.
68°F is exactly 20°C.
100°F equals approximately 37.8°C when rounded to one decimal place.
-40 degrees is the same on both scales. Therefore, -40°F = -40°C.
Yes. The precise formula is (F 32) 5/9. It's easy to use some mental shortcuts for approximate conversions, but (F 32) 5/9 will provide the accurate result.
Enter a known source value, confirm the direction of conversion and compare the result with the level of precision required. Keep extra decimal places for technical work and round only at the final step.
These references can aid in approximate conversion of familiar Fahrenheit temps to Celsius.
| Fahrenheit | Celsius | Common Reference |
|---|---|---|
| 14°F | -10°C | Very cold |
| 23°F | -5°C | Cold |
| 32°F | 0°C | Water freezing point |
| 41°F | 5°C | Cool |
| 50°F | 10°C | Cool |
| 59°F | 15°C | Mild |
| 68°F | 20°C | Mild |
| 77°F | 25°C | Warm |
| 86°F | 30°C | Hot |
| 95°F | 35°C | Very hot |
| 104°F | 40°C | Very hot |
| 122°F | 50°C | Extremely hot |
| 212°F | 100°C | Water boiling point |
Multiply or Divide To make a swift conversion for estimating, deduct 30 from the Fahrenheit temperature and divide the result by two. This is quite useful for approximating the temperature, but it’s the inaccurate one.
For example, for 80°F:
(80 − 30) ÷ 2 = 25°C approximately
The exact calculation is:
(80 − 32) × 5/9 = 26.7°C
The shortcut is useful for rough estimates, while the exact formula should be used when precision is important.
Conversion from Fahrenheit to Celsius can be used to compare weather reports of countries that use different scales. For example, a U. S. weather report may give the temperature in F, while a lot of other agencies may give it in C.
For example, forecast high temperature 75F=23.9C and forecast high 90F=32.2C.
Another reason you might find yourself needing to convert Fahrenheit to Celsius would be the temperature required to cook something. Recipes might give you an oven temperature in F in the U.S. but in C in other parts of the world.
| Fahrenheit | Celsius |
|---|---|
| 250°F | 121.1°C |
| 300°F | 148.9°C |
| 325°F | 162.8°C |
| 350°F | 176.7°C |
| 375°F | 190.6°C |
| 400°F | 204.4°C |
| 425°F | 218.3°C |
| 450°F | 232.2°C |
| 475°F | 246.1°C |
| 500°F | 260°C |
As is the formula, it is just about accurate. A slight discrepancy with an output result will probably come from theroundingof that result to just one (or perhaps zero) decimal point rather than an error in theconversion’SFahrenheid-to-Celsius’.
For example, 100°F produces 37.777...°C. It can be displayed as 37.8°C to one decimal place or 37.78°C to two decimal places.
One decimal place is often adequate for daily weather and household measurements. Technical or scientific use may demand a certain degree of accuracy.
These are guidelines to double check if a Fahrenheit to Celsius conversion makes sense for before accepting the conversion.