Why oven recipes need adjusting for an air fryer
Air fryers are essentially small, powerful convection ovens — a fan circulates hot air much closer to the food than in a standard oven, cooking faster and browning more aggressively at the same dial temperature. Using an oven recipe's exact temperature and time in an air fryer commonly results in over-browned or overcooked food, which is why a straightforward, commonly used adjustment is to lower the temperature by around 20°C (or the Fahrenheit equivalent) and cut the cooking time by roughly 20%.
This calculator applies exactly that widely used rule of thumb to your oven recipe's numbers, giving you a sensible air fryer starting point rather than a random guess.
Why this is a starting point, not an exact science
Air fryer baskets, wattages and airflow patterns vary significantly between brands and models, so the same conversion applied to two different air fryers can produce noticeably different results. This is exactly why the recommended approach is to check food a few minutes before the converted time is up on your first attempt with any new recipe, then note the actual time that worked for future reference with your specific machine.
Food density and shape also matter — thin items like fries or thinly sliced vegetables benefit even more from the air fryer's fast air circulation and may need an even bigger time reduction, while dense items like a whole small roast benefit less dramatically.
Getting the best air fryer results
Avoid overcrowding the basket, since air fryers rely on hot air circulating freely around every piece of food — a packed basket behaves more like a regular oven and won't achieve the faster, crispier results a converted time assumes. Shaking or flipping food halfway through, especially for items like fries or nuggets, also compensates for uneven air circulation and gets closer to the intended result of the conversion.
Frequently Asked Questions
Does every recipe convert well to an air fryer?
Most roasting, baking and crisping recipes convert well; recipes relying on a large volume of liquid, like a casserole or stew, generally aren't suited to an air fryer regardless of conversion.
Why did my food come out underdone using the converted time?
Overcrowding the basket is the most common cause — try cooking in a smaller batch or extending the time slightly and checking more frequently.
Is the 20% time reduction accurate for every food?
It's a solid general starting point; thin or small items often cook even faster than that, so check a few minutes early the first time.
Can I convert Fahrenheit oven recipes too?
Yes, select Fahrenheit in the unit dropdown and the calculator will handle the conversion internally before giving you the adjusted air fryer setting.