Most recipes still assume a conventional oven, but a lot of kitchens now cook more often in an air fryer. Punch in the oven's temperature and time directly and you'll usually end up with something burnt on the outside and underdone in the middle, because an air fryer isn't just a smaller oven. It's a genuinely different cooking environment, and converting between the two takes more than eyeballing it.
Step 1: Understand Why the Conversion Isn't 1:1
An air fryer is a compact convection oven with a much smaller cooking chamber and a fan positioned closer to the food, which circulates hot air far more aggressively than a standard oven's convection setting. That tighter, faster airflow transfers heat to the food's surface more efficiently, which is the whole reason air fryers cook faster and crisp better than a conventional oven at the same temperature.
Because heat transfer is faster, using the oven's exact temperature in an air fryer tends to overcook the exterior before the interior catches up. The standard fix isn't just "cook it less time," it's lowering the temperature and shortening the time together, since both variables need adjusting for the faster heat transfer.
Step 2: Apply the General Conversion Rule
As a starting point: reduce the oven temperature by about 25 degrees Fahrenheit, and reduce the cook time by roughly 20 percent. A recipe calling for 400 degrees for 25 minutes in a conventional oven becomes a reasonable starting point of about 375 degrees for 20 minutes in an air fryer.
This is a starting point, not a guarantee, because air fryer baskets vary meaningfully by brand and wattage, and food shape and thickness change how much the faster airflow actually matters for a given item.
Step 3: Adjust Further Based on Food Type
Thin, high-surface-area foods (fries, chicken wings, thin-cut vegetables) benefit most from the air fryer's faster circulation and often need a slightly bigger time reduction than the general rule suggests, sometimes 25 to 30 percent less time. Dense, thick items (a whole chicken breast, a thick-cut roast) benefit less from the surface effect and need the interior to actually catch up, so a more conservative time reduction, closer to 10 to 15 percent, avoids an overcooked exterior on something still raw in the middle.
Baked goods are the trickiest category to convert, because air fryers cook batters and doughs differently than a conventional oven's more even, ambient heat. A cake or muffin recipe converted at the general 25-degree, 20-percent rule frequently needs additional small adjustments after the first attempt, since batter behavior under aggressive forced air isn't identical to a still oven environment.
Step 4: Don't Skip Checking Early
Because the air fryer's small chamber and fast air circulation both push toward faster, less even cooking than a standard oven, checking doneness earlier than the converted time suggests is worth the extra step, especially the first time you convert a specific recipe. A few extra minutes is a much smaller problem than an overcooked exterior you can't undo.
Step 5: Account for Batch Size and Basket Crowding
An oven recipe rarely worries about airflow around the food, since a full sheet pan in a conventional oven still gets reasonably even heat from all directions. An air fryer's performance depends heavily on air actually circulating around each piece of food, and an overcrowded basket blocks that circulation, which undoes a lot of the speed and crisping advantage the conversion assumes in the first place.
If a recipe fills more than about two-thirds of the basket, cooking in two smaller batches instead of one crowded batch usually produces a result closer to what the converted settings were actually calculated for.
Step 6: Energy Use Is Part of Why the Conversion Is Worth Doing
The temperature and time adjustment isn't just about avoiding a burnt exterior. It's also the reason air fryers save meaningful energy over a conventional oven for smaller portions. A full-size oven has to heat a large interior volume regardless of how much food is actually in it, while an air fryer's small chamber heats up faster and holds less air mass to bring up to temperature, which is part of why a correctly converted air fryer recipe often finishes in less total energy-on time than the same food in a full oven, on top of the shorter cook time itself. Getting the conversion right matters for the electricity bill, not just the texture of the food.
Step 7: Preheating Behaves Differently Too
A conventional oven recipe usually assumes several minutes of preheat time before food goes in, since a large oven cavity takes a while to reach a stable target temperature. Air fryers preheat much faster, often in 2 to 3 minutes given their smaller chamber, and some manufacturers design their air fryers to skip a formal preheat step entirely for shorter cooks. If you're converting a recipe and mechanically copying over the original's preheat time, you're likely adding unnecessary time to the front of the cook, and in some cases giving the food a head start on overcooking before the actual timed portion even begins.
Doing the Conversion Without Recalculating by Hand Every Time
The rules above cover the general case well enough for most recipes, but the exact adjustment varies by food type, thickness, and batch size in ways that are tedious to recalculate from scratch every time. The Air Fryer Converter at EvvyTools converts a conventional oven recipe to air fryer temperature and time automatically, with food-specific adjustments rather than one flat rule, plus flip reminders and a side-by-side energy comparison between the two cooking methods.
For more on where straightforward conversion math breaks down in the kitchen, Why Doubling a Recipe Breaks More Than Just the Math at EvvyTools covers a related problem: why scaling ingredient quantities up or down isn't a single uniform multiplier either, for anyone who wants more of this kind of kitchen-math breakdown.
For general reference on convection cooking principles, Wikipedia's entry on convection ovens covers the airflow mechanics that make air fryers cook the way they do, and America's Test Kitchen has published extensive tested comparisons between conventional and air-fryer cooking results for common foods, worth a look if you want tested numbers rather than a general rule of thumb. The US Department of Energy also publishes general guidance on appliance energy use that covers why smaller cooking appliances like air fryers and toaster ovens tend to use less electricity per meal than a full-size oven for the same or a smaller portion.
Converting a favorite oven recipe to the air fryer takes one extra step most people skip: adjusting temperature and time together, rather than assuming the oven's numbers will just work in a smaller, faster machine. Once that step is part of the habit, the air fryer stops being a separate set of recipes to learn and becomes a faster way to cook the ones you already have.
Keeping a Running List of Conversions That Worked
One habit that pays off quickly: once a converted recipe turns out well, write down the actual settings you used, not just the general rule. Air fryer models vary enough in wattage and basket shape that "375 for 20 minutes" in one machine isn't guaranteed to behave identically in another, and having your own tested settings for the handful of recipes you make regularly beats reapplying the general rule from scratch every time. Over a few months, that running list usually ends up covering most of what you actually cook, at which point the conversion step mostly disappears and you're just cooking from your own tested numbers.
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