How long do you cook something at 400°F in an air fryer instead of the oven?

Reduce the oven time by roughly 20%. A 30-minute bake becomes 23 to 26 minutes, a 45-minute bake becomes 34 to 38 minutes. Check at 75% of the adjusted time. University of Illinois Extension states the rule as "reduce temperature by 25 to 30°F and reduce cooking time by 20%".

What is 400°F in Celsius for an air fryer?

400°F is about 200°C as an oven setting. The air fryer equivalent is 185°C — a 15°C reduction, not a converted 13.9°C, because air fryer dials are marked in steps of 5 and 10.

Oven 400°F · 200°C

400°F in the oven is 375°F in an air fryer

400°F in a conventional oven is about 375°F in an air fryer — reduce the temperature by 25°F and the time by roughly 20%. A 30-minute oven bake at 400°F becomes 23 to 26 minutes at 375°F, checked at 18 minutes. In Celsius that is 200°C down to 185°C.

400°F oven → air fryer

Oven temperature

°F

Oven time

min

Your air fryer

Roughly 5–6 qt / 5–6 L. The shape the conversion rule assumes.

Set air fryer to

375°F

Cook for

23–26 min

Check at 18 min and shake the basket. The USDA puts it plainly: cook times vary with the size and power of the machine, but the safe internal temperature never does.

How long, for a 400°F recipe

Oven time on the left, air fryer time on the right. The three columns are basket sizes — a small basket runs ahead of the rule, a large oven-style unit runs behind it. Check at the earliest figure in your column.

Oven time	Small basket	Standard basket	Oven-style or dual
15 min	11–12 min · check 8	11–13 min · check 9	12–14 min · check 10
20 min	14–16 min · check 11	15–17 min · check 12	16–18 min · check 13
25 min	18–20 min · check 14	19–21 min · check 15	20–23 min · check 16
30 min	21–24 min · check 17	23–26 min · check 18	24–28 min · check 20
40 min	28–32 min · check 22	30–34 min · check 24	32–37 min · check 26
45 min	31–36 min · check 25	34–38 min · check 27	36–41 min · check 29
60 min	42–48 min · check 33	45–51 min · check 36	48–55 min · check 39

What to watch at 400°F

The single most searched conversion, and the one where machines differ most, because 400°F is at or near the top of what smaller air fryers will hold steadily. If yours struggles to stay there with a full basket, the practical answer is a smaller load rather than a longer time — the USDA’s own warning about crowding applies hardest at the hot end.

Overcrowding the appliance can prevent enough air circulation to properly cook the food. — USDA Food Safety and Inspection Service.

Foods cooked near 375°F

These have their own sourced times, which beat any conversion. 56 foods are indexed in total.

Burgers 375°F · 10–18 min · 160°F internal Raw Frozen Taquitos 375°F · 6–12 min Frozen Corn on the Cob 380°F · 10–18 min Fresh Lobster Tail 380°F · 8–10 min Raw Mushrooms 380°F · 8–14 min Fresh Salmon Fillet 380°F · 6–12 min · 145°F internal Raw

Browse every cook time

Other temperatures

300°F 325°F 350°F 375°F 425°F 450°F

Sources for the rule itself, including why it is a range rather than a single figure, are on the converter page. In short: no manufacturer or food agency publishes a conversion formula, and the most authoritative statement of it — University of Illinois Extension — says “reduce temperature by 25 to 30°F and reduce cooking time by 20%”.