Air Fryer Cooking Calculator

The General Rule

Converting an oven recipe for an air fryer follows one simple rule that works for most foods: reduce the temperature by 20°C (about 25°F) and reduce the cooking time by 20%. So a chicken breast that calls for 200°C for 25 minutes in a regular oven becomes 180°C for 20 minutes in an air fryer. The reason is that air fryers are essentially small convection ovens with very powerful fans: hot air circulates intensely around food at high speed, transferring heat far more efficiently than the relatively still air in a conventional oven. This means food cooks faster, and the dry, fast-moving air produces a crispy exterior with much less oil than deep frying — often as little as a teaspoon, sometimes none at all. The 20°C / 20% reduction is a starting point; some foods need more or less adjustment. Thin items like sausages and fish fingers might only need a 15% time reduction; dense items like whole chicken or large jacket potatoes might need closer to 25%. Foods that rely on a wet cooking environment (steamed puddings, custards, anything in a water bath) generally don't work well in an air fryer at all — the dry, fast air is the wrong tool. A worked example: oven chips that call for 220°C for 25 minutes become 200°C for 20 minutes in the air fryer, shaken halfway through. After a few uses with your specific model, you'll learn whether to nudge times up or down from the calculator's baseline.

Don't Overcrowd

The single biggest mistake new air-fryer users make is overcrowding the basket, and it's also the reason they conclude their air fryer 'doesn't work as well as the reviews said'. A single layer of food with space around each piece is essential. The air fryer works by circulating hot air around food — if you pile chips two or three deep, or cram chicken pieces touching each other, the air can't reach the parts in the middle, so they steam rather than crisp. The result is soggy, unevenly cooked food, often with crisp top layers and pale, undercooked underneath. Treat the basket capacity as a rough guide and assume it works best at about 60–70% full, not 100%. For larger quantities, cook in batches — it's still faster overall than the oven for most things, because batches of 12–15 minutes each beats an oven preheat of 10 minutes plus 25 minutes cooking. Shake the basket or turn items halfway through cooking; this evens out browning and exposes the previously-hidden surfaces to the air flow. For items that can't be shaken (chicken breasts, fish fillets), flip them with tongs. Some air fryers have wire racks that let you add a second level for non-overlapping items — useful, but still don't overcrowd. Lining the basket with parchment or foil reduces airflow under the food and partially defeats the point; use only specialised perforated air-fryer liners that allow air through, and even then keep them small.

Check Early

Air fryers vary surprisingly widely between models, brands, and even between two units of the same model — basket size, fan speed, heating element design, and accuracy of the thermostat all affect cooking time. The 20% time reduction is a sensible starting point, but on the first try with any new recipe or new air fryer, check the food about 5 minutes before the calculated end time. Pull the basket, look at the food, poke or cut it as appropriate, and decide whether it needs more time or is ready. Better to underestimate the first time (you can put it back in) than to overestimate and end up with shoe-leather chicken or burnt edges. Smaller air fryers (3–5L baskets) generally cook a bit faster than larger ones (7–10L), because the heat is concentrated in a smaller space. Dual-zone and oven-style air fryers behave more like compact convection ovens than basket fryers, so adjustments may differ. Keep notes the first few times — once you know your specific machine, you'll learn whether the calculator's figures need a small upward or downward tweak for your unit. A meat thermometer remains the gold standard for proteins: 75°C internal for chicken and pork, 70°C for whole cuts of beef and lamb (cooked to your preference for steak), regardless of what the timer says. Visual cues also matter — golden colour, juices running clear, crisp exterior — because doneness is what you want, not strict adherence to a time.

Food Safety Fundamentals

Food safety rules apply regardless of cooking method or time. The danger zone for bacterial growth is 4-60 degrees C — food should not remain in this range for more than 2 hours. Core temperature targets: poultry 74 degrees C throughout (no pink allowed), pork 71 degrees C, beef/lamb can be pink when above 63 degrees C (due to surface-only bacteria on whole cuts). Never use the same equipment for raw and cooked food without washing. Leftovers should be cooled rapidly (within 2 hours), refrigerat