Fahrenheit to Celsius

How to convert Fahrenheit to Celsius

1. Type the temperature in Fahrenheit.
2. The Celsius value shows right away.
3. Check the table below for common temperatures.
4. Change the number to convert another value.

The formula

To go from Fahrenheit to Celsius, subtract 32, then multiply by 5 and divide by 9. In short, Celsius equals Fahrenheit minus 32, times 5/9. For example, 98.6 Fahrenheit becomes 98.6 minus 32, which is 66.6, times 5/9, which is 37 Celsius. That is normal body heat.

When you need this

If you read US weather, recipes, or a thermometer marked in Fahrenheit, this page turns it into the Celsius most of the world uses. A US forecast of 75 is a pleasant 24 Celsius. A fever of 100.4 Fahrenheit is 38 Celsius, the point many guides call a fever.

A few to remember

Water freezes at 32 Fahrenheit, which is 0 Celsius, and boils at 212 Fahrenheit, which is 100 Celsius. Room temperature of about 68 Fahrenheit is 20 Celsius. Minus 40 is the single point where Fahrenheit and Celsius meet at the same number.

FAQ

What is 100 degrees Fahrenheit in Celsius?

About 37.8 degrees Celsius. Subtract 32 to get 68, then multiply by 5/9.

Is 98.6 Fahrenheit a normal temperature?

Yes. It is 37 Celsius, the usual figure for normal body heat.

What Fahrenheit counts as a fever?

Around 100.4 Fahrenheit, which is 38 Celsius, is the common line for a fever.

Why subtract 32 first?

Because Fahrenheit sets its freezing point at 32, not 0. Removing the 32 lines the two scales up before the size change.

Is anything sent to a server?

No. The conversion runs in your browser and nothing is stored.

Is there a quick F to C trick?

Subtract 30 and halve what is left. For 70 degrees that gives 20, close to the exact 21.1. And Fahrenheit to centigrade is the same conversion, centigrade being the older name for Celsius.