How long do you cook something at 300°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 300°F in Celsius for an air fryer?

300°F is about 150°C as an oven setting. The air fryer equivalent is 135°C — a 15°C reduction, not a converted 13.9°C, because air fryer dials are marked in steps of 5 and 10.

Oven 300°F · 150°C

300°F in the oven is 275°F in an air fryer

300°F in a conventional oven is about 275°F in an air fryer — reduce the temperature by 25°F and the time by roughly 20%. A 30-minute oven bake at 300°F becomes 23 to 26 minutes at 275°F, checked at 18 minutes. In Celsius that is 150°C down to 135°C.

300°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 300°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 300°F

This is the low end of the dial, and the one place the 25-degree rule is least useful. Below about 325°F an air fryer is doing gentle convection rather than the aggressive browning it exists for, so recipes written this low — custards, slow bakes, anything with an egg set in it — often want the oven temperature kept as it is and only the time trimmed. Cosori puts cookies at 300°F, which is about the only thing in this range that genuinely benefits from the basket.

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

Other temperatures

325°F 350°F 375°F 400°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%”.