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What is 400 °F in Celsius?
400 °F is 204 °C, so set the oven to 200 °C — or 180 °C if it’s a fan (convection) oven. That’s gas mark 6; in an air fryer, about 375 °F (190 °C).
From
200 °C = 400 °F
- Conventional °C204 °C (≈ 200 °C)
- Fan / convection180 °C
- Fahrenheit400 °F
- Gas mark6
- Thermostat (France)7
- Air fryer190 °C / 375 °F, ~20% less time
Fan (convection) ovens cook hotter, so set them about 20 °C lower (25 °F in American recipes). Every oven runs a little differently — an oven thermometer shows the real temperature.
Good to know:
- 400 °F is the roasting setting: vegetables, potatoes, salmon fillets, sheet-pan dinners and oven bacon.
- Use a large rimmed sheet pan and a single layer — crowded vegetables steam instead of browning.
- In an air fryer, about 375 °F. The basket is small and the fan strong, so start checking after about 80% of the oven time.
Oven temperature chart:
| °C | Fan °C | °F | Gas | Th. |
|---|---|---|---|---|
| 110 °C | 90 °C | 225 °F | ¼ | 3.5 |
| 120 °C | 100 °C | 250 °F | ½ | 4 |
| 140 °C | 120 °C | 275 °F | 1 | 4.5 |
| 150 °C | 130 °C | 300 °F | 2 | 5 |
| 160 °C | 140 °C | 325 °F | 3 | 5.5 |
| 170 °C | 150 °C | 350 °F | 3 | 5.5 |
| 180 °C | 160 °C | 350 °F | 4 | 6 |
| 190 °C | 170 °C | 375 °F | 5 | 6.5 |
| 200 °C | 180 °C | 400 °F | 6 | 6.5 |
| 220 °C | 200 °C | 425 °F | 7 | 7.5 |
| 230 °C | 210 °C | 450 °F | 8 | 7.5 |
| 240 °C | 220 °C | 475 °F | 9 | 8 |
| 250 °C | 230 °C | 475 °F | 9 | 8.5 |
Popular temperatures:
How to convert oven temperatures:
- Type the temperature
straight from the recipe.
- Pick what it’s in
°C, fan °C, °F, gas mark or thermostat.
- Read off your setting
for your oven — or your air fryer.
Questions:
- How long to bake salmon at 400 °F?
- 12–15 minutes for 1-inch-thick fillets, until it flakes easily and reads 145 °F.
- How long to roast potatoes at 400 °F?
- 35–45 minutes for 1–1½-inch chunks, flipped halfway.
- How long to bake chicken breast at 400 °F?
- 18–22 minutes for a 6–8 oz breast, until the thickest part reads 165 °F.
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