400 °F to °C

About 400 °F in °C

400 °F is 204.4 °C. The formula is (F − 32) × 5/9: 400 − 32 = 368, then 368 × 5 ÷ 9 = 204.4. Celsius and Fahrenheit cross at − 40, not at zero, which is why the subtraction comes first.

Fan ovens run about 20 °C cooler than the temperature written on a conventional recipe, so a 400 °F instruction becomes 184 °C on a fan setting. If your oven only has round numbers, choose the nearest (200 °C) and adjust the time by about 10%.

A 400 °F oven is in the hot band — roughly gas mark 6. That matters more than the exact degree: a 10 °C error changes a sponge by a couple of minutes, while the wrong band changes whether the outside browns before the middle sets.

Gas marks are a third scale in the same kitchen: 400 °F, 204 °C and a gas mark all describe one oven heat, and British recipes still print two of the three side by side. Converting 400 °F to 204 °C and then to a fan setting of 184 °C keeps the recipe's intent even when your oven runs a little hot.

Recipe apps often write the question as 400 f to c rather than with degree symbols, and the answer is the same: 204.4 c. Rounded to 204 c, that is what most oven dials can actually be set to.

How the calculation works

• (400 °F − 32) × 5/9 = 204.4 °C
• Fan oven: 204.4 − 20 = 184.4 °C
• Reverse: (204.4 °C × 9/5) + 32 = 400 °F

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