The notation C represents the temperature in Celsius and F is the temperature in Fahrenheit. Once you know the formula, it is easy to convert fahrenheit to celcius with these three steps.
The answer will be the temperature in degrees Celsius. For example, suppose the temperature is 80 degrees Fahrenheit and you want to know what the figure would be in Celsius. Use the above three steps:
So the temperature in Celsius is 26.7 C