To convert a Fahrenheit temperature into Celsius, subtract 32 from the temperature and then divide by 1.8. This conversion is shown by the following equation, in which Ft is the Fahrenheit temperature, and Ct is Celsius temperature:
Ct = (Ft - 32)/1.8
Say you're baking bread at 375 degrees Fahrenheit, and want to know the temperature in Celsius. Subtract 32 from 375, and divide by 1.8:
Ct = (375 - 32)/1.8
Ct = 343/1.8
Ct = 190.56
Your oven has a temperature of 190.56 degrees Celsius.