The formula to convert Fahrenheit to Celsius is:

°C = (°F - 32) x 5/9

So, to convert 111F to Celsius:

°C = (111 - 32) x 5/9

°C = 79 x 5/9

°C = 444/9

°C = 49.33

Therefore, 111F is equal to 49.33 Celsius.