This air fryer converter translates oven recipes into air fryer settings — the working rule of −25 °F and ~80% of the time — with the checks and exceptions that make it reliable.
The −25 °F / ×0.8 Rule — and Why It Works
An air fryer is a small, aggressive convection oven: forced hot air strips the insulating boundary layer off food surfaces, so heat transfers faster — recipes compensate with lower temperature and shorter time. Base oven-unit conversions live on our Oven Temperature Converter. Part of our Food Calculators collection.
Worked Examples (Verified Conversions)
- 400 °F / 20 min oven (defaults) → 375 °F / ~16 min air fryer — the frozen-fries and roasted-vegetable zone
- 350 °F / 30 min (casserole territory) → 325 °F / ~24 min — and casseroles mostly shouldn’t convert at all (volume/depth defeats airflow; see exceptions)
- 425 °F / 45 min (whole chicken pieces) → 400 °F / ~36 min, thermometer confirming 165 °F at the thigh
- Metric shadow: 200 °C oven ≈ 175–180 °C air fryer — the °C rule is −20 to −25 °C with the same 0.8 time factor
Where the Rule Bends or Breaks
- Delicate bakes (cakes, custards) scorch on top before setting — convert cautiously, tent with foil, or keep the oven.
- Wet batters drip through baskets: air fryers want dry coatings or frozen-set batters.
- Overcrowding kills the airflow that justifies conversion — single layer, batches beat one sad pile.
- Preheating matters more in small cavities: 3–5 minutes to target before timing starts.
- Cheese and light toppings migrate in the fan blast — secure with toothpicks or add late.
Related Tools
- Oven Temperature Converter — °F/°C/Gas Mark
- Meat Temperature Calculator — the doneness targets to probe for
- Food Calculators — the full collection
Frequently Asked Questions
How do I convert oven recipes to an air fryer?
The standard working rule: reduce temperature by 25 °F (about 20 °C) and time to ~80% of the oven’s, checking early. 400 °F/20 min becomes 375 °F/16 min. This calculator applies it and reminds you when to start checking — models vary, thermometers don’t.
Why does an air fryer cook faster at lower temperature?
Forced convection: the fan continuously replaces the cool, moist air layer hugging food with fresh hot air, raising the heat-transfer coefficient several-fold over a still oven. Smaller cavity volume also preheats and recovers temperature faster. Lower setpoint + faster transfer lands at the same surface cooking with less total time.
What shouldn’t go in an air fryer?
Wet-battered foods (batter drips before setting), large roasts/casseroles (airflow can’t reach centers evenly), delicate custards and soufflés, and anything very light that the fan will relocate (loose herbs, grated cheese unanchored, tortillas solo). Frozen and dry-coated foods are its home turf.
Do I need to preheat an air fryer?
Briefly, yes — 3–5 minutes. Unlike a big oven, the tiny cavity’s walls store little heat, so food loaded cold spends its first minutes in a ramping environment the converted time didn’t budget for. Many models have a preheat mode; use it for baking-style items especially.
How do I know when air-fried meat is done?
By internal temperature, not converted minutes: poultry 165 °F, ground meats 160 °F, steaks/chops 145 °F + rest (USDA). Air fryers brown aggressively, making color a liar — probe the thickest point. Our Meat Temperature Calculator lists the full target table.
Is this air fryer converter free?
Yes — free, instant, no sign-up.