Fahrenheit to Celsius Converter
Convert Fahrenheit to Celsius quickly and accurately. Type a temperature in °F and the Celsius equivalent appears instantly.
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Formula
To convert Fahrenheit to Celsius, multiply by 0.5555555556 and then add -17.77777777777778.
1 °F = -17.22 °C
Celsius = Fahrenheit × 0.5555555556 − 17.77777777777778
About fahrenheit and celsius
Celsius sets 0° at the freezing point of water and 100° at its boiling point at sea level, which makes it the standard for weather, cooking and science almost everywhere.
Fahrenheit is still the everyday scale in the United States. Its degrees are smaller — a 1°F step is only 5/9 of a 1°C step — so Fahrenheit temperatures look larger for the same conditions.
Accuracy
The two scales cross at −40°, the only temperature where both read the same number. Because the conversion has an offset as well as a multiplier, you cannot convert a temperature difference the same way you convert a temperature: a change of 1°C is a change of 1.8°F, with no +32.
Fahrenheit to Celsius conversion table
| Fahrenheit | Celsius |
|---|---|
| -40 °F | -40 °C |
| 0 °F | -17.78 °C |
| 32 °F | 0 °C |
| 50 °F | 10 °C |
| 68 °F | 20 °C |
| 72 °F | 22.22 °C |
| 90 °F | 32.22 °C |
| 98.6 °F | 37 °C |
| 100 °F | 37.78 °C |
| 212 °F | 100 °C |
Frequently asked questions
How do you convert Fahrenheit to Celsius?
Celsius = Fahrenheit × 0.5555555556 − 17.77777777777778. For example, -40 °F equals -40 °C.
What is 72°F in Celsius?
72°F is 22.22°C. That is the typical setting for indoor room temperature in the United States.
What is 98.6°F in Celsius?
98.6°F is exactly 37°C, the conventional figure for normal human body temperature.
How can I convert Fahrenheit to Celsius in my head?
Subtract 30 and then halve the result. For 70°F that gives 20°C against a true 21.11°C — good enough to judge the weather.
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