Fahrenheit to Celsius

1 °F = -17.22222 °C

Fahrenheit to Celsius is the conversion for Americans heading abroad, students working in scientific units, and anyone outside the US reading an American recipe, weather report, or medical guideline. The Fahrenheit scale is still standard in everyday US life, so the numbers often need translating for the rest of the world.

From

When you need to convert degrees Fahrenheit to degrees Celsius

Following a US recipe that lists oven temperatures such as 350 °F
Understanding a US weather forecast or heat advisory
Converting a body temperature reading taken with an American thermometer
Science and lab coursework, where Celsius and kelvins are standard

How to convert degrees Fahrenheit to degrees Celsius

°C = °F × 0.5555556 − 17.77778

Example: 25 °F = -3.888889 °C

Common temperatures

Fahrenheit (°F)	Celsius (°C)
0 °F	-17.77778 °C
32 °F	0 °C
50 °F	10 °C
68 °F	20 °C
72 °F	22.22222 °C
98.6 °F	37 °C
212 °F	100 °C
325 °F	162.7778 °C
350 °F	176.6667 °C
400 °F	204.4444 °C

Tips for converting degrees Fahrenheit to degrees Celsius

Exact formula: subtract 32 first, then multiply by 5/9 (about 0.5556). Multiplying before subtracting is the most common mistake.
For everyday weather, "subtract 30 and halve" lands within about 2 °C between 30 °F and 85 °F, but is off by more for oven temperatures.
Every 9 °F change equals exactly 5 °C, which helps when converting a temperature difference rather than a reading.

Fahrenheit to Celsius conversion table

Fahrenheit (°F)	Celsius (°C)
-40 °F	-40 °C
-20 °F	-28.88889 °C
-10 °F	-23.33333 °C
0 °F	-17.77778 °C
10 °F	-12.22222 °C
20 °F	-6.666667 °C
25 °F	-3.888889 °C
30 °F	-1.111111 °C
37 °F	2.777778 °C
40 °F	4.444444 °C
50 °F	10 °C
60 °F	15.55556 °C
70 °F	21.11111 °C
80 °F	26.66667 °C
90 °F	32.22222 °C
100 °F	37.77778 °C
150 °F	65.55556 °C
200 °F	93.33333 °C
300 °F	148.8889 °C

About the units

Fahrenheit: The degree Fahrenheit is the temperature scale used in the United States. Water freezes at 32 °F and boils at 212 °F at sea level.

Celsius: The degree Celsius is the temperature scale used in most of the world. Water freezes at 0 °C and boils at 100 °C at sea level.

Frequently asked questions

What is 1 degree Fahrenheit in degrees Celsius?

1 degree Fahrenheit equals -17.22222 degrees Celsius.

What is 1 degree Celsius in degrees Fahrenheit?

1 degree Celsius equals 33.8 degrees Fahrenheit.

How do I convert degrees Fahrenheit to degrees Celsius?

Use the formula °C = °F × 0.5555556 − 17.77778.

What is 10 degrees Fahrenheit in degrees Celsius?

10 degrees Fahrenheit equals -12.22222 degrees Celsius.

Related conversions

Sources

Conversion factors use the exact definitions published by NIST and the BIPM, and are checked by automated tests against those definitions.

Last updated: October 17, 2026