Air Fryer Conversion Calculator

What is an air fryer conversion calculator?

An air fryer conversion calculator turns the temperature and time printed on a conventional-oven recipe into the right settings for an air fryer. You enter the oven temperature and the oven time, and it returns a lower air-fryer temperature and a shorter air-fryer time as a ready-to-use starting point. That saves you from guessing or burning a first attempt, because an air fryer is essentially a small, powerful convection oven that cooks faster and hotter than a full-size oven.

The tool above works in either Fahrenheit or Celsius and shows both the suggested temperature and the suggested minutes at once. It is built for the everyday job of taking a recipe written for an oven — a tray of chicken thighs, roast vegetables, frozen snacks or a small bake — and getting it into the air fryer without trial and error. Treat the result as a tested starting guideline, then trust your eyes and a thermometer the first time through.

How does the air fryer conversion work?

The calculator applies the two adjustments cooks use by hand, just more precisely:

air temperature = oven temperature − 25°F   (or − 15°C if Celsius)
                  rounded to the nearest 5 degrees
air time        = oven time × 0.8            (about 20% shorter)
                  rounded to the nearest minute

Terms and units: oven temperature and oven time are the figures from your recipe; the air temperature is what you set on the air fryer, and the air time is roughly how long to cook before checking. Temperature is handled in whichever scale you choose — subtract 25 in Fahrenheit or 15 in Celsius — and is rounded to the nearest 5 degrees so it lands on a value your dial or display can actually hit. Time is always in minutes, rounded to the nearest whole minute.

Why lower both? The fan in an air fryer drives hot air around the food in a small chamber, so the surface heats and browns faster than in a roomy oven. Dropping the temperature by about 25°F keeps the outside from scorching before the inside is done, and trimming the time by about 20% accounts for that quicker cooking. Both temperature and time must be positive numbers — you cannot convert a zero or negative setting.

Because air fryers vary in wattage and basket size, and because food is checked early rather than cooked blindly to the timer, this is a guideline, not a guarantee. The first time you convert a recipe, check a few minutes before the suggested air time and adjust from there.

Examples

Each example below matches the tool’s logic exactly: temperature minus 25°F (or 15°C) rounded to the nearest 5 degrees, and time multiplied by 0.8 rounded to the nearest minute.

Example 1 — 400°F for 25 minutes

• air temperature = 400 − 25 = 375°F
• air time = 25 × 0.8 = 20 minutes
• so set the air fryer to about 375°F for 20 minutes, checking early

Example 2 — 200°C for 30 minutes

• air temperature = 200 − 15 = 185°C
• air time = 30 × 0.8 = 24 minutes
• so set the air fryer to about 185°C for 24 minutes

Example 3 — 350°F for 40 minutes

• air temperature = 350 − 25 = 325°F
• air time = 40 × 0.8 = 32 minutes
• so set the air fryer to about 325°F for 32 minutes

Example 4 — 425°F for 35 minutes

• air temperature = 425 − 25 = 400°F
• air time = 35 × 0.8 = 28 minutes

Example 5 — 180°C for 25 minutes

• air temperature = 180 − 15 = 165°C
• air time = 25 × 0.8 = 20 minutes

Notice that the time can land on a fraction before rounding: 375°F for 22 oven minutes gives 22 × 0.8 = 17.6, which rounds to 18 minutes at 350°F. Always check doneness the first time you convert a recipe, since these are starting points rather than fixed rules.

Oven-to-air-fryer reference chart

These are the conversions the tool produces for common oven settings. The Fahrenheit and Celsius rows are separate, paired roughly by how hot they are, so read across whichever scale your recipe uses.

The temperature column simply subtracts 25°F or 15°C; the time column is 80% of the oven time. For any value not listed, type it into the tool and read the exact result.

Common uses

• Converting a printed or online recipe: take oven instructions straight to the air fryer without searching for a separate version.
• Reheating leftovers crisp: drop the temperature and time from oven reheating guidance for a faster, crunchier result.
• Frozen foods: start from the box’s oven directions, then check early since breaded and thin items cook especially fast.
• Roasting vegetables and proteins: chicken, fish, potatoes and trays of veg transfer well with the standard reduction.
• Small bakes: cookies, hand pies and single portions where heating a big oven is overkill.
• Recipe testing: get a sensible first setting, then note the real time that worked for your machine.

Tips and common mistakes

• Check early, every first time. The air time is when to start checking, not a guaranteed finish. Pull the basket and look a few minutes before it.
• Use a thermometer for meat. Doneness is about internal temperature, not the timer — verify poultry, pork and fish reach a safe core temperature.
• Do not overcrowd the basket. Crowded food steams instead of crisping and cooks unevenly; cook in a single layer or in batches and the timing holds better.
• Shake or flip partway. Tossing fries, vegetables and nuggets halfway through gives even browning, which the conversion assumes.
• Mind very thin or delicate items. Thin fish, breaded coatings and small pastries can cook faster than the 20% reduction suggests, so watch them closely.
• Round to what your machine allows. The tool rounds temperature to the nearest 5 degrees; set the closest value your air fryer offers.
• Preheat if your recipe relied on it. If the oven version preheated, give the air fryer a couple of minutes to come up to temperature too.

Limitations and notes

This calculator adjusts temperature and time only — it does not change ingredient quantities, pan size or method, and it cannot account for every model. Air fryers differ in wattage, basket size and airflow, so a powerful compact model may run faster than a large one, and food density matters: a thick roast behaves differently from a single layer of fries. The minus-25°F (15°C) and times-0.8 rule is a widely used starting guideline for baked and roasted foods, not a precise formula for every dish, which is exactly why food should be checked early rather than cooked blindly to the suggested time.

Both the temperature and the time must be positive numbers. Results are rounded — temperature to the nearest 5 degrees and time to the nearest minute — so expect small differences from a hand calculation, and treat the output as a sensible first setting to refine on your own machine. Everything runs privately in your browser; no temperatures, times or recipes are sent to a server or stored anywhere.

For more kitchen maths, try the recipe scaler, the pizza dough calculator and the coffee to water ratio calculator on the cooking category page, or convert units with the Celsius to Fahrenheit converter and the weight converter.