400°F Oven to Air Fryer: Use 375°F
Drop the temperature by 25°F and cut the time by 20% as a starting point.
Published by the RecipeAirFryer editorial team · How we source times · Updated
Times and temperatures come from our reviewed cooking database. Explanatory text on each page is generated from that entry so the numbers stay consistent.
If a recipe says 400°F, set a typical basket air fryer to 375°F (191°C / 375°F) and plan on about 80% of the oven time. At this oven setting people usually cook fries, wings, roasted potatoes, frozen snacks. The 20% rule is a starting point; Frozen fries still need a single layer. The 20% time cut assumes air can move.
How to convert 400°F to an air fryer
- 1Read the oven recipe: it calls for 400°F (204°C / 400°F).
- 2Preheat the air fryer to 375°F (191°C / 375°F), not 400°F.
- 3Multiply the oven minutes by 0.8. Example: oven fries that take 20 minutes at 400°F becomes about 16 minutes at 375°F, shaken every 5 minutes.
- 4Cook in a single layer and check early. Frozen fries still need a single layer. The 20% time cut assumes air can move.
Conversion chart
| Oven time at 400°F | Air fryer time at 375°F |
|---|---|
| 10 min | 8 min |
| 15 min | 12 min |
| 20 min | 16 min |
| 25 min | 20 min |
| 30 min | 24 min |
| 40 min | 32 min |
| 45 min | 36 min |
| 60 min | 48 min |
What 400°F is usually used for
In a conventional oven, 400°F is the setting for fries, wings, roasted potatoes, frozen snacks. Converting that heat without thinking about the food is why people burn cookies or undercook a joint.
Worked example: oven fries that take 20 minutes at 400°F. In the air fryer that is about 16 minutes at 375°F, shaken every 5 minutes.
Why the temperature drops
An oven heats mostly by radiation from its elements and by slow convection. An air fryer is a small chamber with a fan driving air across the food at speed, so heat transfers into the surface much faster at the same dial setting.
That is why 400°F in an air fryer would over-brown the outside before the middle caught up. Setting it to 375°F instead gives you the same finish in less time.
What to watch at 375°F
Frozen fries still need a single layer. The 20% time cut assumes air can move.
Dense items such as a whole chicken may need close to the original oven time because heat still has to travel to the centre. Go by internal temperature, not only the converted clock.
Gas mark 6 in an air fryer
400°F is roughly gas mark 6. If your recipe is written in gas marks, convert to 204°C / 400°F first, then apply the same drop to get 191°C / 375°F in the air fryer.
Frequently Asked Questions
What is 400°F in an air fryer?
375°F, which is 191°C / 375°F. Reduce the cooking time by about 20% as well, then check early.
What foods are usually cooked at 400°F?
fries, wings, roasted potatoes, frozen snacks. Example conversion: oven fries that take 20 minutes at 400°F becomes about 16 minutes at 375°F, shaken every 5 minutes in the air fryer.
Why not just use 400°F in the air fryer?
You can, but the outside will brown or burn before the inside is cooked. The fan transfers heat into the food far faster than an oven does, so the lower setting gives a more even result.
Do I need to preheat the air fryer?
A 2-3 minute preheat helps for anything breaded, frozen or that you want crisp. For longer cooks it makes little difference.