Oven to Air Fryer Conversion

Drop the oven temperature by 25°F and cut the time by about 20%. That's the whole rule. A recipe that says 400°F for 20 minutes in the oven becomes roughly 375°F for 16 minutes in the air fryer, and you start checking before that.

For most things you'd roast or fry, like chicken pieces, chips, sausages and veg, that gets you within a minute or two on the first go. But the rule holds for the foods an air fryer is actually good at. It falls apart on delicate bakes and on any recipe big enough to need two or three basket loads, and most conversion pages won't tell you that. I test everything on a Platinum 7.6L basket unit, so the numbers below are the basket-style ranges. Here's the rule, and the point where you should just use the oven.

The temperature step

Take 25°F off whatever the oven recipe says. That's about 15°C if your dial is in Celsius. It's the same subtraction at every temperature, so you don't need a calculator for this part.

If your oven recipe was written for a fan or convection oven, the gap is smaller. A fan oven already blows hot air around, so it behaves more like an air fryer. Take a little less off the top and check early.

The time step

Cut the oven time by about a fifth, then check at the halfway mark anyway. Twenty minutes becomes sixteen. Thirty becomes twenty-four. The reason you check early is that an air fryer sits much closer to the food than an oven does, so the outside colours faster than you'd expect. Pull it the moment it looks done rather than waiting for the timer.

For anything with a bone or a thick middle, the timer is a suggestion and the thermometer is the answer. Chicken and all poultry are done at 165°F (74°C). Beef, pork and lamb chops or roasts hit 145°F (63°C), then rest 3 minutes. Burgers and other ground meat go to 160°F (71°C). Fish is done at 145°F (63°C) or when it flakes. Convert the time all you like. You still verify a protein with a probe, not the clock.

The five-second method I actually use

Every time I convert something off a packet or a recipe card, it's the same short routine:

• Knock 25°F off the oven temperature.
• Knock about 20% off the time.
• Preheat the basket 3 minutes so the food starts cooking the second it lands.
• Single layer, gaps between pieces. This is the step people skip, and it's the one that decides whether the food crisps or steams.
• Check at halfway, shake or flip, and pull on colour and internal temp, not on the timer.

Basket-style vs oven-style: add a few minutes

My ranges come off a basket unit. If you've got an oven-style air fryer, the ones shaped like a small toaster oven with racks, there's more empty space inside for the same wattage to heat, so most items want roughly 2 to 5 minutes more than the basket number. Same temperature, a touch longer. It's a small thing that throws a lot of converted times off, because a chart tested on one style and read on the other quietly runs short.

Where the rule breaks: don't convert these

This is the part the calculator can't do for you. The 25°F/20% rule assumes the air fryer is the right tool. Sometimes it isn't, and converting the recipe just gives you a worse version of it. Send these back to the oven or the pan:

• Delicate cakes and thin batters. The airflow is turbulent enough to scatter a loose batter before it sets, and the top browns while the middle is still wet. A dense loaf or a firm muffin can work. A sponge that needs a gentle, even rise doesn't.
• Anything in a wet batter. It drips straight through the basket before it firms up. Beer-battered fish is an oven or pan job. Breadcrumb coatings are fine.
• Leafy greens and very light bits. They get picked up by the fan and thrown at the element. Not worth the cleanup.
• Big-batch tray meals. More on this below, because it's the one people fight the hardest.

Telling you when not to bother is the honest part of this. An air fryer is a small, fast, aggressive oven. Convert the things it's built for and it's brilliant. Force the rest through it and you'll wish you'd used the oven.

The batch maths nobody does for you

Here's the number that ruins most conversions, and it's got nothing to do with temperature. A basket holds a single layer. A recipe written for a big oven tray, a whole tray of roast potatoes or a family lot of wings, does not fit in one layer. On my 7.6L basket, a "serves 4" tray is usually two rounds, sometimes three.

And once you're cooking in rounds, the 20% time saving is gone. Two 16-minute batches is longer than one 40-minute oven tray, before you count the basket cooling between loads. The air fryer wins on a single layer and loses on volume. If you're feeding a crowd off one recipe, the oven is often the faster tool. That's the honest answer, even on an air fryer site.

A few conversions people ask about

Frozen food. Same rule off the packet, with one catch. Packet times assume a full-size oven, so drop 25°F and start checking a good few minutes early. In my testing, frozen chips run about 3–4 minutes longer than fresh-cut chips of the same thickness, so don't expect frozen and fresh to land on the same time.

Reheating leftovers. The air fryer is genuinely better than the microwave here. I do two slices of leftover pizza at 350°F for 3–4 minutes and the base comes back crisp instead of floppy. Reheat anything you're eating to 165°F (74°C) to be safe.

Do you always preheat? For thin, fast foods like chips, nuggets and anything under about 20mm, yes, because a cold start noticeably softens the crust. For a long roast it matters less. Three minutes covers most of it.

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