Here's the formula to convert Fahrenheit to Celsius:

°C = (°F - 32) x 5/9

Where:

* °C is the temperature in Celsius

* °F is the temperature in Fahrenheit

Here's how to use the formula:

1. Subtract 32 from the Fahrenheit temperature.

2. Multiply the result by 5.

3. Divide the result by 9.

Example:

Let's convert 77°F to Celsius:

1. 77 - 32 = 45

2. 45 x 5 = 225

3. 225 / 9 = 25

Therefore, 77°F is equal to 25°C.