Is an Air Fryer Cheaper Than an Oven?

The air fryer is a compact convection oven with an energetic fan. Everything about its running cost follows from the size of the space it has to heat.

The arithmetic

Energy used equals power rating multiplied by time, adjusted for how much of that time the element is actually drawing power.

Electric oven. Typically 2 to 2.5 kW. It draws full power while heating up, then cycles on and off to hold temperature, averaging perhaps 60 percent of the rating once hot. Preheating to 200 degrees takes 10 to 15 minutes at full draw.

A 30 minute bake including preheat uses roughly 1.3 to 1.6 kWh. At 25p a unit, that is about 33 to 40p.

Air fryer. Typically 1.4 to 2 kW, but the chamber is a fraction of the size. It reaches temperature in a minute or two and cycles more often because there is less mass to keep warm.

A 20 minute session uses roughly 0.4 to 0.6 kWh, about 10 to 15p.

For the same food, cooked for a similar time, the air fryer costs roughly a third as much.

Where the saving comes from

Three things, in order of size.

Volume. A typical oven cavity is around 60 litres. An air fryer basket is 4 to 8 litres. Heating 60 litres of air and a heavy steel cavity to 200 degrees takes far more energy than heating 5 litres.

Preheat. An oven spends 10 to 15 minutes at full draw before cooking starts. An air fryer needs two or three, and often none.

Cooking time. Faster air movement and closer proximity to the element mean food cooks 20 to 25 percent faster at the same temperature, which is why air fryer recipes reduce both temperature and time.

Where the oven wins

Quantity. This is the part the comparisons usually skip.

An air fryer basket holds one or two portions. Cooking for four means two or three batches, which means running it two or three times and losing the speed advantage.

An oven heats 60 litres once and can then cook three trays simultaneously. Per portion, a full oven is more efficient than a small appliance run repeatedly.

The crossover point is roughly three to four portions, depending on the appliance. Below that, the air fryer wins comfortably. Above it, the oven does.

A worked comparison

Two chicken breasts and a tray of vegetables.

• Air fryer: two 15 minute batches, about 0.8 kWh, roughly 20p
• Oven: 25 minutes plus 12 minutes preheat, about 1.4 kWh, roughly 35p

Air fryer wins.

A roast dinner for four: meat, potatoes, two vegetable trays.

• Air fryer: four or five batches, well over 1.5 kWh, plus a great deal of attention
• Oven: one 90 minute session, about 2.5 kWh, roughly 63p, everything cooking at once

Oven wins on convenience and on cost per portion.

The microwave, which beats both

For reheating and for cooking anything that does not need browning, a microwave is cheaper than either.

It heats the food directly rather than heating air around it, so almost none of the energy goes into warming a chamber. Reheating a plate takes 2 to 3 minutes at around 0.05 kWh, roughly 1p.

The trade is that it cannot brown or crisp, which is exactly what the other two are for. A microwave for reheating and an air fryer for crisping is a genuinely efficient pairing.

Beyond the running cost

Purchase price. An air fryer costs 50 to 200. If it replaces oven use several times a week, the payback on energy alone is typically one to three years. If it sits unused after a month, it never pays back.

Kitchen heat. An air fryer puts far less heat into the room, which is genuinely pleasant in summer and a small loss in winter.

Speed. No preheat and faster cooking often matters more than the pennies. A meal on the table 15 minutes sooner has a value that does not appear in the energy calculation.

Capacity and washing up. The basket is small and most need cleaning after each batch.

Converting oven recipes

The usual rule is to reduce the temperature by 20 degrees Celsius and the time by about 20 percent, then check early.

So something calling for 200 degrees for 25 minutes becomes roughly 180 degrees for 20 minutes in an air fryer. Check at 15, because the smaller chamber and faster airflow make overcooking easy and recovery impossible.

Shake or turn the basket halfway, since the circulation is strong but not perfectly even.

The honest answer

Cheaper for one or two portions, by a factor of two or three. Roughly equal for three. More expensive, and considerably more work, for four or more.

For a single person or a couple cooking most evenings, an air fryer will genuinely reduce the bill. For a family cooking full meals, it is a useful second appliance rather than an oven replacement.