Air fryer or oven: which is right for you and which costs less to run
For one to four people, an air fryer does almost everything you use the oven for in half the time and for less than half the electricity. For a big roast, a tray bake or baking, the oven is still king.
Quick verdict
- Buy an air fryer if… you cook for one to four, use the oven for chips, meat, fish, veg or reheating, and want to be quicker and spend less on electricity. That is where the difference really shows.
- Go for a dual-basket model if… there are four or more of you, or you want to cook the main and the side at the same time, at different temperatures, and have them finish together.
- Stick with the oven if… you often do whole roasts, large trays, bread or cakes, or cook for a crowd: an air fryer is too small and you would end up cooking in batches.
Air fryer vs oven at a glance
| Single-basket air fryer | Dual-basket air fryer | Electric oven | |
|---|---|---|---|
| Capacity | 3–6 L (1–4 people) | 7–10 L (4–6 people) | 60–75 L |
| Power | 1,300–1,800 W | 2,000–2,500 W | 2,500–3,500 W |
| Preheating | 0–3 min | 0–3 min | 10–15 min |
| Chips for two | 15–20 min | 15–20 min | 30–40 min with preheating |
| Electricity per use (≈ 25p/kWh) | 10–15p | 13–20p | 30–40p |
| Price to buy | £45–£110 | £90–£180 | You already have one (or £250–£600) |
| Cleaning | Basket in the dishwasher | Two baskets in the dishwasher | Trays and walls: the hardest |
Indicative UK prices as of November 2026. Running costs use about 25p/kWh, close to the Ofgem price cap, and depend on the dish, temperature and model.
What each one really costs to run
An air fryer has less power than an oven, but above all it heats a far smaller space: there are no 70 litres of air to preheat for ten minutes. A 20-minute dish uses around 0.5 kWh, roughly 12–13p at 25p/kWh.
The same dish in the oven, with preheating, usually goes over 1.2 kWh: around 30p or more. If you use the oven five times a week for things that fit in an air fryer, you save roughly £3.50–£4.50 a month. Not a fortune, but enough to pay for the air fryer within a couple of years.
The big saving is not the electricity, it is time: no preheating and air closer to the food mean most things are done in half the time.
Does it come out like the oven (or a deep fryer)?
An air fryer is basically a small, very powerful fan oven. That is why it browns and crisps better than a conventional oven: chips, wings, nuggets, roast veg and breaded food come out very well with a teaspoon of oil.
It does not replace deep frying: air-fried chips are closer to very crispy roast potatoes than to chip-shop chips. In return, they have far less oil.
Where the oven wins: large joints (a whole chicken only fits in the bigger baskets), cakes and bread that need gentle, even heat, and anything that goes on a wide tray.
What size you need
- One or two people: 3–4.5 L is enough and takes up little space.
- Three or four people: a 5–6 L single basket, or a dual-basket model if you want to cook two things at once.
- Families of five or more: two baskets totalling 7–10 L, or an air fryer oven with shelves.
- Check the dimensions: many are over 35 cm tall. Make sure it fits under your wall cupboards.
Food needs to sit in a single layer to cook properly. If you always fill it to the top, it is too small for you.
Is it healthier?
Compared with deep frying, yes: with a teaspoon of oil instead of a bath of it, calories and fat per portion drop a lot. Compared with the oven, it is just as healthy: it does the same thing, only faster.
For better and healthier results: do not burn the food (dark browning on potatoes and bread is best avoided), shake the basket halfway through and use spray oil rather than pouring it.
What to look for when buying
- Real capacity in litres, and a square basket rather than a round one: it uses the space better.
- A window or light to check on food without opening it; not essential, but very handy at first.
- A non-stick, dishwasher-safe basket and crisper plate.
- On dual-basket models, a 'sync finish' function if you cook a main and a side.
- Noise: most run at 50–60 dB; if your kitchen is open-plan, check reviews about the fan.
- Brands with spare baskets and UK support: Ninja, Tower, Cosori or Instant.
Where to buy
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Ninja Foodi Dual Zone AF300UK
Two 3.8 L baskets you set separately that finish at the same time. The UK's reference dual-basket air fryer.
Tower Vortx dual basket air fryer
Two baskets for much less money, from a long-standing UK kitchen brand.
COSORI Pro LE 4.7L air fryer
A compact 4.7 L square basket with excellent reviews. Ideal for one to three people.
Instant Vortex Plus air fryer with ClearCook window
A viewing window and inside light, so you can check on food without opening it.
Air fryer paper liners
Paper or silicone liners for the basket: less cleaning when things drip or stick.
Frequently asked questions
Is an air fryer cheaper to run than an oven?
Yes, for normal portions: there is no preheating and it heats a small space. A 20-minute dish uses about 0.5 kWh in an air fryer and more than twice that in an oven with preheating.
Can an air fryer replace an oven?
For one to four people and everyday meals, almost entirely. For big roasts, trays, bread and baking, no: you still need the oven for those.
What size air fryer should I buy?
3–4.5 L for one or two people, 5–6 L for three or four, and a dual-basket model (7–10 L in total) for families or if you want to cook two things at once.
Can you put baking paper in an air fryer?
Yes, as long as there is food on top holding it down and it does not cover the whole basket, so the air can flow. Never put it in on its own while preheating: the fan can lift it onto the heating element.
Do air-fried chips taste like deep-fried ones?
They are closer to very crispy roast potatoes. With a teaspoon of oil, fine salt and a shake of the basket halfway through, they get quite close, with far less oil.