400 Fahrenheit to Celsius Oven
400°F is the oven temperature you'll often see in recipes — here's the equivalent in °C, plus the formula and the closest gas mark.
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How the conversion works
To convert Fahrenheit to Celsius: (°F − 32) × 5 ÷ 9 = °C. If your oven doesn't allow exact settings, round to the closest available
temperature and check the food near the end of the recommended cooking time.
Assumptions
- Gas marks are matched to the closest canonical temperature (Mark 1–9, 140–240°C).
- Results are rounded to a useful precision, not full float-point values.