Air Fryer Conversion Explained: A UK Buyer's Guide

Short answer: to convert an oven recipe for an air fryer, lower the temperature by 10–20°C and cut the time by about 20%, then check food a few minutes early. That single rule handles most everyday UK cooking; thicker or baked items just need small tweaks.

Plenty of people reach this page while switching from the oven to save money — with winter energy bills climbing, the real question is whether an air fryer is genuinely cheaper than a fan oven for the meals you actually cook. Getting the conversion right is what makes that saving real, because it stops you overcooking the first few batches.

How do you convert oven times and temperatures?

Start here, then adjust to your model:

• 180°C oven → about 160–170°C air fryer
• 190°C oven → about 170–180°C air fryer
• 200°C oven → about 180–190°C air fryer
• 220°C oven → about 200°C air fryer (check often)

For time, reduce the oven figure by 15–25% and check early. So a packet saying 200°C for 20 minutes in a fan oven becomes roughly 180–190°C for about 16 minutes in an air fryer. For a worked example on the nation's favourite, see our air fryer chips timings.

Why do air fryers cook faster than ovens?

An air fryer is a compact convection cooker: a small chamber with a fan driving hot air right against the food. Because it is only heating a small chamber, it reaches temperature in a couple of minutes and browns surfaces quickly, where a big oven cavity takes longer to come up to heat and circulate.

Does an air fryer actually save money on energy?

For small and medium meals, usually yes — not because the element sips power (a 1700W air fryer draws real wattage), but because it skips a long preheat and finishes sooner. A 1700W air fryer that runs for far less time than a preheated fan oven is doing less total work, which is where the saving comes from. The honest caveat: exact pounds-and-pence depend on your tariff, the dish and how full the basket is, so treat "cheaper" as "usually, for small batches" rather than a fixed figure.

Why the rule is only a starting point

No formula covers everything. Breaded foods brown fast; dense items like jacket potatoes need less temperature drop but longer time; meat depends on thickness, not just weight. Overcrowding a small basket blocks airflow and slows cooking, which is why a well-shaped basket often beats a bigger but awkward one. For everyday proteins, our sausages in air fryer guide shows converted times in practice, and our air fryer whole chicken guide covers a full roast.

Does basket size affect conversion?

Yes. A square 5.5L basket gives more usable single-layer space than many round baskets of the same headline capacity, so food is less crowded and converts more predictably. That is the practical difference between a chart that works and one that leaves half the tray pale.

The Arfrrcos 5.5L air fryer

The Arfrrcos 5.5L digital air fryer makes conversions easy to live with: 1700W with rapid 360° air circulation, 11 one-touch presets, and a square non-stick basket that spreads food in a single layer. It is £254.85 inc. VAT (about £212.38 ex VAT) with free UK delivery, 30-day returns and a 12-month UK warranty.

Frequently asked questions

Do I always reduce the oven temperature for an air fryer?

As a starting point, lower the oven temperature by 10 to 20 degrees C and cut the time by about 20%. Always check a few minutes early, because basket size and wattage vary between models.

Can I use fan-oven settings as a guide?

Fan-oven recipes are closer to air fryer behaviour than conventional settings, but food still cooks a little faster because it sits nearer the heat. Treat fan settings as a rough baseline, not an exact match.

Is an air fryer cheaper to run than a fan oven?

For small and medium meals it usually is, because it skips a long preheat and finishes sooner, so it does less total work. The exact saving depends on your tariff, the dish and how full the basket is.

Does basket size affect air fryer conversion?

Yes. Overcrowding blocks airflow and lengthens cooking time. A square 5.5L basket gives more single-layer space than many round baskets of the same headline capacity, so results are more predictable.