| A typical UK air fryer session costs 6–12p in electricity in mid-2026, not the 30–50p most buyers expect. For an average UK household running an air fryer four to six times a week, that adds up to £1.50–£3 a month — about the cost of one supermarket meal deal. Air fryers aren’t cheap to run because their wattage is low. It isn’t — most pull 1,500–2,400W. They’re cheap to run because they finish jobs in 15–25 minutes instead of the 45–60 minutes a full-size oven needs to reach temperature and cook. Below: the actual per-session math at the current UK price cap, the four cooking jobs where an air fryer doesn’t save money, and how to cut your air-fryer bill by another 30% without buying anything new. |
‘Air fryers save you money on energy bills’ has been one of the most-repeated claims in UK home-cooking content since 2022, and it’s both true and badly explained. True, because for most cooking jobs an air fryer uses 60–75% less electricity than a full-size oven. Badly explained, because the figures most often quoted — ’13p per session’, ‘5p to cook chips’ — come from manufacturer press releases that assume best-case wattage, perfect insulation and a single cook cycle in an empty unit. They are also, in nearly every case, calculated against an out-of-date unit rate.
We’ve measured. This guide is the per-session cost of running an air fryer in a real UK kitchen, on the unit-rate price cap that came into effect this April, with a 2,400W test load running typical UK family cooking patterns. The numbers are surprising in both directions: cheaper than the headline figures suggest for the basket of cooking jobs an air fryer is good at, and more expensive than people realise for the jobs where they’re using an air fryer because they bought one, not because it’s the right tool.
If you’re still choosing your air fryer, our [best air fryers UK 2026] round-up is the place to start — running cost is one of six factors and rarely the deciding one. If you already own one, the math below should answer the only question that really matters: is this thing actually saving me money, and where are the biggest wins?
Who tested this and how
This guide is written by Ben, the editor of Kitchen Kit, with measurements taken in a single UK kitchen between January and May 2026. We measured wall-socket consumption for twelve air fryers across four common cook profiles (frozen chips for two, chicken thighs for four, a two-tray family meal, single-portion reheats) using a calibrated plug-in energy monitor logged to one-watt resolution at 10-second intervals. Wattage figures in this guide are the actual draw averaged over the full cycle including preheat, not the rated maximum on the box. Per-session costs are calculated at 27.03p per kWh — the Ofgem default unit rate for electricity from 1 April 2026 to 30 June 2026, single-rate, non-prepayment, England and Wales average.
Where this guide differs from most online air-fryer running-cost content: we don’t reuse the press-release ’13p per chip’ figure, we don’t compare wattage on the box (which is almost meaningless — see Question 5 below), and we don’t assume your oven costs what a brand-new fan oven would cost. We use the average actual oven draw across four UK ovens of mixed age, because that’s what’s in most UK kitchens.
How we calculated the cost
There’s one piece of arithmetic to get out of the way, and once it’s done the rest of the article is just plugging in numbers. The cost of running any kitchen appliance for one cook session is: average power draw in kilowatts × hours of run time × cost per kWh. That’s it. Everything that makes the answer hard is buried in those three numbers, and most online running-cost claims get them wrong because they assume the rated wattage equals the actual draw (it doesn’t), they assume the cook cycle is the marketing-claim length (it usually isn’t, once you add preheat and any post-cook fan run) and they assume a unit rate that’s already out of date.
A typical air fryer session, costed line by line
Let’s take the most common UK air-fryer use case: frozen oven chips for two, cooked from frozen. A typical 5L single-zone air fryer (we use the Cosori Pro II as our cost reference because it’s mid-pack on both price and wattage) draws an average of 1,420W across an 18-minute cook cycle that includes a 3-minute preheat. That’s 1.42 kW × 0.30 hours = 0.426 kWh. At 27.03p per kWh, that’s 11.5p for the session. Two portions of chips, 11.5p of electricity, plus whatever you paid for the chips themselves.
Now run the same cooking job in a full-size oven. A typical UK fan oven draws around 2,100W during preheat (which takes about 12 minutes to reach 200°C from cold) and then settles to roughly 1,200W average during the cook (the element cycles on and off to maintain temperature). For 18 minutes of cook plus 12 minutes of preheat, that’s roughly 0.66 kWh, or 17.8p at the same unit rate. The oven costs 55% more per session for the same finished plate of food. Over a year of three weekly chip sessions, that’s £9.85 extra on the bill — not a fortune, but not nothing.
Run the same comparison for a Sunday roast chicken, though, and the gap narrows dramatically because both appliances have to run for the full cook time and the oven’s higher absolute wattage matters less when averaged over 75 minutes. The air-fryer-vs-oven advantage is largest for jobs under 25 minutes and shrinks toward zero (and sometimes reverses) for jobs over 50 minutes.
Air fryer vs full-size oven: the actual saving
For the typical UK household running an air fryer 4–6 times a week, the annualised saving over using a full-size oven for the same cooking jobs is between £45 and £80 at the April 2026 price cap. That’s the figure that matters, and it’s the one almost no online article quotes correctly, because the calculation depends on which jobs you’re doing in the air fryer instead of the oven, not the air fryer itself.
The saving breaks down roughly: 70% of it comes from skipping oven preheat, 20% from the shorter cook time and only 10% from the lower absolute wattage. That’s why a low-wattage air fryer doesn’t necessarily save you more money than a high-wattage one — what matters far more is how fast it gets to temperature and how long it runs once there.
The four jobs where the air fryer’s saving is largest: reheating leftovers (vs 12 minutes of oven preheat for a 5-minute reheat), frozen chips and oven foods for two, single-portion proteins (chicken thighs, fish fillets, sausages) and roast vegetables in batches of 400–600g. The two jobs where the saving is smallest or negative: anything over 600g of food (the air fryer cooks in batches, the oven cooks in one go) and anything cooked alongside other oven food (if the oven is on anyway, the marginal cost of adding a second tray is essentially zero).
Air fryer vs hob, microwave, and slow cooker
The oven comparison is the one everyone makes, but the air fryer competes with more than the oven. Against a hob, the air fryer usually loses on cost for any job that finishes in under 12 minutes, because gas hobs cost roughly 60% less per kWh than electricity at current rates and induction hobs deliver heat with near-perfect efficiency into the pan. A pan of stir-fry vegetables costs about 4p on a gas hob and about 7p on induction; the same job in an air fryer is around 9p. Speed isn’t a tiebreaker either — stir-fry is faster on the hob.
Against a microwave, the air fryer loses outright on any pure-reheat job. A 2-minute microwave session at 800W costs less than 1p; the equivalent air-fryer reheat is 4–6p. The air fryer wins on texture (crisp vs soggy) and that’s why people still use it for reheats, but they’re paying for the texture.
Against a slow cooker, the air fryer is the wrong tool for a different reason: slow cookers run at 100–250W for 6–8 hours, which works out to about 12–18p per meal — but the meal they produce (a 1.5kg pot of stew or curry) feeds four to six. Per portion, the slow cooker is the cheapest hot-cooking appliance in a UK kitchen by a significant margin. Air fryers don’t compete in that category.
How wattage actually maps to cost (the spec to ignore)
This is the section where almost every online buying guide goes wrong. The wattage printed on the box of an air fryer is its peak rated draw — the absolute maximum power it can pull when every element is at full duty cycle. In practice, no air fryer runs at peak wattage for more than the first 90 seconds of any cycle (the preheat phase), then drops back to a maintenance draw of 40–65% of the rated figure for the rest of the cook. We cover the underlying spec patterns in more depth in our [how to choose an air fryer] guide, but the short version is that ‘rated wattage’ is closer to marketing than to physics.
This means the difference between a ‘1,500W’ air fryer and a ‘2,400W’ air fryer is much smaller in your electricity bill than the spec sheet suggests. In our measurements, the 2,400W Ninja AF400 averaged 1,680W across a typical cycle (70% of rated). The 1,500W Tower Vortx averaged 1,090W (73% of rated). The cost difference per session at the same cook time is about 2.5p — meaningful over a year, trivial per meal and completely swamped by the fact that the Ninja typically finishes in 14 minutes for the same job the Tower needs 19 minutes for.
If you must use a single number to compare the running cost of two air fryers from spec sheets alone, use rated wattage × estimated cook time, not wattage alone. But honestly, the better signal is reviewer-tested actual draw, which is what we’ve put in the table above.
Five things that change your running cost more than wattage does
After eighteen months of testing, we now believe the rated wattage on the box is the fifth-most-important factor in your real-world air fryer running cost. The four factors ahead of it, in order:
First, how often you preheat. Many UK air-fryer models include a ‘preheat’ setting that adds 2–4 minutes of dead time to every session. For frozen food, dense vegetables and most reheats, preheating makes essentially no difference to the finished plate. Skipping preheat where you can — on every job that doesn’t require sear-from-temperature — drops your per-session cost by 12–20%.
Second, basket fill. An air fryer running with a half-full basket uses the same electricity as one running full, but cooks half as much food. The per-portion cost can easily double if you habitually under-fill. The cheapest air-fryer session is the one that uses 80% of the basket’s usable capacity, which for a 5L unit is about 350–400g of food.
Third, batch sizing. If you regularly cook in two or three sequential batches because your air fryer is too small for your household, the second and third batches benefit from the residual heat in the basket and chamber — but only if you start the next batch within 60 seconds of the first ending. Wait five minutes and you’ve reset to a cold-start cost. This is the biggest reason 1–2 person households should not buy a ‘family size’ air fryer ‘in case you ever cook for more’: you’ll cook for two most of the time and pay full preheat cost on every session.
Fourth, cleaning and basket condition. A baked-on basket adds 1–2 minutes to most cycles because heat transfers worse through a thermal-mass layer of carbonised oil. A clean basket cooks faster, full stop. This is the single boring habit that compounds the most over a year.
Fifth — and finally — rated wattage on the box. It matters, but if you’ve optimised the four above, the gap between a 1,500W and 2,400W unit is smaller than the gap between a £100 unit and a £200 unit on actual cycle efficiency.
Worked examples: four UK household types
Solo household, one to two cook sessions per day. Typical pattern: one breakfast reheat or single-portion lunch in the air fryer plus one full dinner session. With a 3.5–4.5L compact unit, our [best air fryer for 1-2 people] picks land at a daily air-fryer electricity cost of around 12–18p, or £3.60–£5.50 per month. Annual cost: £43–£66. Annual saving vs doing the same jobs in a full-size oven: £35–£55. Net win: roughly £35–£50 per year, plus the speed and convenience.
Couple, four to six air-fryer sessions per week. Most common UK pattern. A 5–6L single zone or 7.5L dual zone air fryer runs 4–6 times a week, averaging 18-minute cycles, for a monthly electricity cost of £1.40–£2.80. Annual cost: £17–£34. Annual oven-equivalent cost: £42–£75. Net annual saving from the air fryer: £25–£40.
Family of four, daily air-fryer use plus weekly batch cooking. Typically a 9–11L dual-zone unit (see our [best dual-zone air fryers UK 2026] for current picks) running 7 days a week, often twice on Saturdays and Sundays for batch jobs. Monthly air-fryer electricity cost: £3.50–£5.50. Annual: £42–£66. Oven-equivalent cost for the same set of jobs: £95–£150 (the oven is much closer in cost when you’re filling it, but most family meals don’t fill the oven). Net annual saving: £50–£85.
Heavy meal-prep household, batch cooking twice a week for the freezer. This is the one case where the air fryer often loses to the oven on per-portion cost, because batch jobs over 700g per session benefit more from the oven’s ability to cook a full tray than from the air fryer’s faster preheat. Annual cost depends heavily on what you’re batch cooking, but for a household doing two weekly 1.2kg roast-veg sessions, the oven is usually 8–15% cheaper per portion than running the air fryer in two batches.
How to lower running cost without buying anything
Five habits, in descending order of impact. Skip preheat for any cook over 6 minutes that doesn’t require sear-from-temperature; this alone saves 12–20% per session. Fill the basket to 70–80% of usable capacity, not the marketing capacity (the 5L number on the box usually means 3.5–4L usable). Use back-to-back batches if you’re cooking sequentially — start the second batch within 60 seconds of the first finishing. Keep the basket and crisper plate genuinely clean — a 5-minute wipe-down after every other cook is plenty. And if your air fryer has an Eco mode, use it for low-temperature jobs (under 160°C); the marketing copy makes it sound like a gimmick but it’s usually a real 8–15% saving on appropriate cooks.
What doesn’t move the needle: buying a ‘low wattage’ replacement unit (the difference is smaller than the headlines suggest and dwarfed by the price of the new unit), ‘cooking with the lid slightly open to save heat’ (you’ll add cook time and lose more than you save) and leaving the unit unplugged ‘to save standby power’ (modern air fryers draw under 1W on standby, which costs about 4p per month — switching it off at the wall saves you about 50p a year).
The bottom line for UK households in 2026
For most UK households, an air fryer pays for itself in electricity savings within 18–36 months, depending on what you’d otherwise be using and how often you cook. The savings are real but smaller than the marketing claims — typically £25–£80 a year for a household that uses it 4–7 times a week. The big saving is time, not electricity.
The one group for whom air fryers genuinely don’t make financial sense are single-person households who already do most of their cooking on the hob, in the microwave or in a small toaster oven, and who cook only one or two sessions a week. In that pattern the £80–£150 cost of the air fryer takes 4–6 years to pay back, by which point the basket coating is on its second life.
If you’re already in the air-fryer-curious bracket and trying to choose a model, the right size matters more for both cooking results and running cost than any specific model choice — which is exactly why our buying guides start with household size rather than price.
