How to convert oven temperatures from Fahrenheit to Celsius
Find the matching number on your dial and check which heating mode the recipe assumes.
A recipe that says 350°F is describing an oven temperature, even if your oven only shows degrees Celsius. Subtract 32 from 350, multiply by five and divide by nine. You get about 176.7°C. With a dial marked in five-degree steps, 175°C is the closest setting. If the author gives both values, use the value they tested for your scale.
To go in the other direction, multiply Celsius by nine, divide by five and add 32. For example, 200°C becomes 392°F. A digital oven that moves in five-degree increments can be set to 390°F. Decimal precision in the calculation does not give a home oven an equally precise thermostat.
Look for a second piece of information next to the number. Fan, convection, conventional and static describe how the oven delivers heat. Switching from Fahrenheit to Celsius does not change that mode. If the recipe says 180°C fan, check the manual for the corresponding function on your oven. Some models automatically convert a temperature you enter when you select convection.
Write the unit and mode together in the margin of a recipe you repeat. Add the rack position and the sign that told you it was ready, such as set edges on a tray of cookies. Those details will be more helpful on the next batch than a temperature recorded without its context.
