Fahrenheit to Celsius Converter

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Convert °F to °C (°C = (°F − 32) × 5/9), for fever readings, US recipes and weather.

From

1 °F = -17.22222222 °C

1 °F in every temperature unit
Unit	Value
Celsius °C	-17.22222222
Fahrenheit °F	1
Kelvin K	255.9277778

How to use, limits & privacy

About Fahrenheit to Celsius Converter

Convert Fahrenheit to Celsius with °C = (°F − 32) × 5/9: subtract 32, then multiply by 5 and divide by 9. Many thermometers used in Indian homes still show °F, and American recipes and weather use it. Quick reference: 32 °F = 0 °C, 68 °F = 20 °C, 98.6 °F = 37 °C, 100 °F = 37.78 °C, 104 °F = 40 °C and 212 °F = 100 °C. The page opens with Fahrenheit in From and Celsius in To.

How to Use

Type the °F reading

Enter the Fahrenheit value in the From box, for example 101.5 from a thermometer or 375 from a recipe.

Read °C

The To box shows Celsius. Most results do not end, so they are shown to 10 significant digits, such as 38.61111111; round to one decimal for everyday use.

Look at kelvin if needed

The table under the converter shows the same temperature in kelvin.

Convert back

Type in the To box, or press Swap units, to turn °C into °F. Copy result copies the number.

Privacy & Processing

Mode: local
Files Leave Browser: Local tool processing; review details below
Max Input Size: Device memory limits
Account Required: No
Data Stored Locally: Nothing you type is saved. If you switch to another category, that choice is remembered in this browser.
Network Processing: Assets or models may require an initial download

Everything is calculated in your browser. Nothing you type is sent anywhere.

Rules & Limitations

Subtract 32 before multiplying. Multiplying first, a common slip, gives a wrong answer.
Readings below -459.67 °F (absolute zero) are impossible, and the tool warns if you type one.
The thermometer reading itself may vary with where it is taken; the tool only converts the number.

Top Suggestions

Reading a fever on a Fahrenheit digital thermometer in Celsius
Following a US recipe that gives oven settings such as 350 °F or 400 °F
Understanding weather forecasts from the US
Converting temperatures in science or engineering problems

Fahrenheit to Celsius Converter FAQ

What is 100 °F in Celsius?

100 °F is 37.78 °C: 100 − 32 = 68, and 68 × 5/9 = 37.777…. For other readings: 99 °F = 37.22 °C, 101 °F = 38.33 °C, 102 °F = 38.89 °C and 103 °F = 39.44 °C.

What is 98.6 °F in Celsius?

Exactly 37 °C, the value usually given for normal body temperature. Readings a little above or below it can be normal too.

What is 350 °F in Celsius for an oven?

350 °F is 176.67 °C, which recipes round to 180 °C. 375 °F is 190.56 °C, 400 °F is 204.44 °C and 425 °F is 218.33 °C.

How do I convert Fahrenheit to Celsius quickly?

Subtract 30 and halve it. For 80 °F that is 25 °C, close to the exact 26.67 °C. For cooking or medical readings, use the exact result from the tool.

Why does the Celsius value have so many decimals?

Dividing by 9 rarely gives a whole number, so values such as 37.777… repeat for ever. The tool shows up to 10 significant digits; round to one decimal place for most uses.