Air Fryer Conversion Calculator
Air fryer temperature and time from any oven recipe.
What it does
Air fryers cook like small, fierce convection ovens, so oven recipes need a haircut to fit. The working rule from university extension kitchens: drop the temperature by 25 F and cut the time by about 20 %. A 400 F, 30 minute tray becomes 375 F for 24 minutes in the basket.
The tool above runs both unit systems. Imperial mode subtracts 25 F; metric mode subtracts 15 C, the dial step matching the 13.9 C physics. Time multiplies by 0.8 in both. Defaults mirror: 400 F and 200 C each give 24 minutes here.
Extension sources agree on the band. South Dakota State states the 25 F cut plainly, Illinois Extension gives minus 25 to 30 F with 20 % less time, and Mississippi State tables list finished points like 400 F wings for 12 minutes. USDA FSIS frames the safety side: air fryers need 5 to 25 minutes at 350 to 400 F by food, always to thermometer temps.
Baskets punish crowding. Air must touch the food to crisp it, so single layers beat piles and batches beat stuffing. Shake or flip halfway, check early on first runs, and let dense foods run the full converted time to safe temp.
How to use
- Pick imperial (F) or metric (C).
- Enter the recipe oven temperature.
- Enter the recipe oven time in minutes.
- Read air fryer temp and time.
- Check 2 to 3 minutes early on new foods.
- Confirm safe internal temp with a thermometer.
Formula
- oven temp
- Recipe oven temp: 200 to 500 F or 100 to 260 C.
- oven time
- Recipe oven minutes, 5 to 300.
- 25 F
- Fahrenheit cut per SDSU and Illinois Extension.
- 0.8
- Time factor: 20 % off the oven minutes.
25 F is a 13.9 C step, rounded to the 15 C dial step in metric guides. Illinois Extension states the band as minus 25 to 30 F with 20 % less time.
Worked example
Example: 400 F for 30 minutes
Imperial defaults: 400 F oven for 30 minutes. Metric mirrors at 200 C.
- Inputs: oven 400 F for 30 minutes.
- Temp: 400 minus 25 = 375 F.
- Time: 30 x 0.8 = 24 minutes.
- Metric mirror: 200 C becomes 185 C for the same 24 minutes.
- Tool shows 375 F, 24 min.
Reference table
| Oven | Air fryer | Time example |
|---|---|---|
| 350 F / 175 C | 325 F / 165 C | 30 min becomes 24 |
| 375 F / 190 C | 350 F / 175 C | 25 min becomes 20 |
| 400 F / 200 C | 375 F / 185 C | 30 min becomes 24 |
| 425 F / 220 C | 400 F / 205 C | 20 min becomes 16 |
| 450 F / 230 C | 425 F / 220 C | 15 min becomes 12 |
Limits
- Rule of thumb, not a recipe. Thick foods need thermometer checks.
- Ignores preheat, basket size, and batch thickness.
- Metric 15 C is a dial rounding of a 13.9 C step.
- Fried batter coatings still drip without oil set steps.
Common mistakes
- Converting without checking early on new foods.
- Crowding the basket and steaming instead of crisping.
- Skipping the thermometer for poultry and pork.
- Using fan oven settings with the full cut again.
- Forgetting preheat on long cooks.
Try it yourself
Quick checks. Answers sit tucked under each question.
Oven 350 F for 45 minutes?
350 minus 25 = 325 F. 45 x 0.8 = 36 minutes.
Oven 425 F for 20 minutes?
425 minus 25 = 400 F. 20 x 0.8 = 16 minutes. Metric 220 C gives 205 C.
Questions
How do I convert an oven recipe?
Drop temp by 25 F (about 15 C) and cut time by about 20 %. A 400 F, 30 minute recipe becomes 375 F for 24 minutes.
Why lower the temperature?
Fast circulating air browns sooner. Lower heat keeps the outside from burning before the center cooks.
What about convection recipes?
Yes. Air fryers are small convection ovens, so fan oven settings already close need only a small cut or none.
What safe temps still apply?
Poultry 165 F, ground meat 160 F, whole beef, pork, veal, and lamb cuts 145 F with a 3 minute rest, fish 145 F.
Should I check early?
Check 2 to 3 minutes early the first run. Basket size and food thickness shift finish times.
Can I overfill the basket?
Yes. Crowding steams food instead of crisping it. Cook in batches for crunch.
Sources
- USDA FSIS: Air Fryers and Food Safety
- South Dakota State Extension: Air Fryer 101 (minus 25 F)
- Univ. of Nebraska-Lincoln: Food Safety Tips for Air Fryers