Air Fryer Conversion Calculator

The 25°F / 20% rule

The standard conversion: reduce oven temperature by 25°F, reduce cooking time by ~20%. So a recipe calling for 400°F for 30 minutes in the oven becomes 375°F for 24 minutes in an air fryer. The reverse direction (air fryer → oven): add 25°F and increase time by 25%.

Why these numbers? Air fryers move hot air with a powerful fan, which transfers heat to food much faster than still-air baking. The smaller chamber also concentrates heat. Result: food cooks faster and benefits from a slightly lower temperature to avoid the outside burning before the inside is done.

Why air fryer is essentially a small convection oven

An air fryer is a high-velocity convection oven in a small basket form factor. The original innovation wasn't the cooking method (convection ovens are decades old) — it was the marketing-friendly “air fryer” name and basket-shape design that surfaced food on all sides for even browning.

If your oven has a convection setting, you can usually convert oven recipes more directly: convection at the same temperature minus 25°F gives similar results. The air fryer's real advantages over convection: smaller chamber heats up faster, basket flips and shakes are easier, and the form factor encourages single-layer cooking which works better than crowded sheet pans.

Foods that benefit from air fryer

• Anything you'd normally fry: chicken wings, fries, fried chicken, falafel — get crispy with much less oil.
• Frozen items: frozen fries, mozzarella sticks, dumplings, taquitos — cook faster and crispier than oven.
• Roasted vegetables: brussels sprouts, broccoli, carrots, cauliflower — char better than oven roasting.
• Bacon: significantly less mess than skillet.
• Reheating fried foods: leftover pizza, fried chicken, fries — restores crispness much better than microwave.
• Single portions: small enough to be efficient for one or two servings.

Foods that don't work well

• Battered foods: wet batter drips through the basket. Use breading or pre-fry briefly.
• Leafy greens: blow around in the air flow. Use a trivet or skip.
• Cheesy melts where the cheese spreads: drips into the heating element. Keep cheese contained or skip.
• Whole turkeys / large roasts: too big for most baskets. Use the oven.
• Liquid-based dishes: stews, soups, casseroles — there's no way to contain liquids.
• Foods that need browning over a long time: low-and-slow recipes don't suit the air fryer's design.

Common adjustments

• Single layer rule: don't crowd the basket. Air needs to circulate around each piece. Cook in batches if needed.
• Shake or flip halfway: especially for fries, vegetables, anything small. Pause, shake, resume.
• Reduce oil: foods that the recipe says to coat with oil often need much less in an air fryer. A spray or 1-tsp drizzle replaces several tablespoons of conventional roasting oil.
• Watch closely the first time: every air fryer model is slightly different. Start checking at 80% of converted time, then adjust on subsequent cooks.
• Larger items: lower temp, longer time: a thick chicken breast benefits from 350°F, not 400°F, to avoid burning the outside.

When the conversion fails

The 25°F / 20% rule is a starting point, not a guarantee. Some recipes need bigger adjustments:

• Very large items: reduce temp more, increase time. A 6-lb chicken needs 325°F for 40-50 minutes.
• Delicate baked goods (cakes, soufflés): often don't convert well. Use a real oven.
• Recipes that need a hot start and slow finish: try the air fryer's “preheat” or two-temperature approach.
• Foods that need steam (bread crust, jacket potatoes): air fryer is too dry. Use a small dish of water in the basket if your model allows.

For other cooking tools: Cooking Conversion Calculator for cups/grams/temperature, Unit Converter for any measurement, Calorie Calculator for daily nutrition.