How do I convert Fahrenheit to Celsius?

Subtract 32, then multiply by 5/9. 77 °F − 32 = 45, and 45 × 5/9 = 25 °C. Order matters: subtract first, then multiply.

What is 350 °F in Celsius for baking?

350 °F is 176.7 °C, usually written as 175 or 180 °C on ovens. For a fan oven, recipes often suggest about 20 °C lower.

Where do Fahrenheit and Celsius match?

At −40. −40 °F is exactly −40 °C, the only temperature where both scales show the same number.

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Fahrenheit to Celsius

°F to °C for forecasts, ovens and US recipes.

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Exact NIST Factors

Fahrenheit to Celsius

Convert °F to °C: subtract 32, then multiply by 5/9

From

68 degrees Fahrenheit = 20 degrees Celsius

Formula: °C = (°F − 32) × 5/9

Decimals

Degrees Fahrenheit to degrees Celsius table

Degrees Fahrenheit (°F)	Degrees Celsius (°C)
-40	-40
-20	-28.88888889
-10	-23.33333333
0	-17.77777778
10	-12.22222222
20	-6.666666667
25	-3.888888889
30	-1.111111111
37	2.777777778
40	4.444444444
50	10
100	37.77777778

Calculated on your device with exact factors from NIST and the SI.

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How to convert Fahrenheit to Celsius

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Fahrenheit to Celsius: what to know

Fahrenheit is the temperature scale used for weather, ovens and body temperature in the United States and a few other places; Celsius is used almost everywhere else. Because the scales have different zero points, you subtract first and then scale: °C = (°F − 32) × 5/9.

The 32 removes the offset between the freezing points of water (32 °F and 0 °C), and the 5/9 accounts for the size of a degree: 180 Fahrenheit degrees separate freezing from boiling, against 100 Celsius degrees. Worked examples: 72 °F − 32 = 40, × 5/9 = 22.2 °C; 425 °F (a hot oven) is 218.3 °C; 98.6 °F is 37 °C; 0 °F is −17.8 °C.

Some results repeat forever, such as 50 °F = 10 °C exactly but 70 °F = 21.111... °C. That comes from dividing by 9, not from an approximation, and the converter shows up to 10 significant digits. For weather or cooking, rounding to the nearest whole degree is usually plenty.

Popular uses

Converting US weather forecasts to Celsius
Setting an oven from an American recipe
Reading a Fahrenheit thermometer or thermostat
Converting temperatures in science homework

Tips for the best result

Quick estimate: subtract 30 and halve it (80 °F → 25 °C; exact 26.7 °C).
A change of 9 °F equals a change of 5 °C.
Fan ovens usually run about 20 °C cooler than the converted conventional setting.

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