Air Fryer vs Oven: What It Costs to Run in the UK
Last updated: 2026-07 · Built from real UK owner discussions — sources linked throughout.
A Ninja Foodi MAX Dual Zone AF400UK costs about 30p to run for half an hour. The machine draws 2,470W, so the sum is 2.47kW × 0.5h × 24.67p = 30.5p, using the 2026 price-cap unit rate of 24.67p per kWh. Cook the same meal in an electric oven and you are paying to bring 60–70 litres of empty cavity up to temperature instead of the 4–6 litres inside an air fryer drawer, plus a preheat you can skip entirely. That gap is the whole cost argument in one line.
The problem with most running-cost articles is that they model a 1,500W appliance. That is the class average — air fryers sit between 1,000W and 1,800W as a category — but the two machines UK forums actually recommend are well above it: the AF400UK at 2,470W and the AF300UK at 2,400W, both of which we rank on our guide to the air fryers UK owners actually recommend. Use the generic figure and you understate a Ninja dual's cost per hour by around 40%.
Below is the arithmetic for each wattage, the annual totals at three usage levels, the payback period on a £150 machine, and the situations where the oven still wins. Capacity is the other half of the running-cost question — a drawer that is too small means cooking twice — so read it alongside what size air fryer you need.
How much does it cost to run an air fryer in the UK?
Between 30p and 31p for a half-hour cook on the Ninja dual-zone models UK owners buy most, at 24.67p per kWh. The AF400UK draws 2,470W, so 2.47kW × 0.5h × 24.67p = 30.5p. The 2,400W AF300UK costs 29.6p. A generic 1,500W air fryer costs 18.5p for the same half hour.
Every figure here uses the same method: convert wattage to kilowatts, multiply by hours run, then multiply by your unit rate. We use 24.67p per kWh throughout — the 2026 price-cap rate our research recorded — so scale the numbers proportionally if your tariff differs. The same arithmetic covers any appliance with a plate wattage, including dehumidifier running costs.
One honest caveat: these are ceiling figures. They assume the element pulls full power for the entire cook, whereas in practice the thermostat cycles the element off once the drawer reaches temperature. A short blast from cold sits close to the full figure; a long, low-temperature bake sits below it.
| Model | Wattage | 15 minutes | 30 minutes | 1 hour |
|---|---|---|---|---|
| Ninja Foodi MAX Dual Zone AF400UK | 2,470W | 15.2p | 30.5p | 60.9p |
| Ninja Foodi Dual Zone AF300UK | 2,400W | 14.8p | 29.6p | 59.2p |
| Typical air fryer used by calculators | 1,500W | 9.3p | 18.5p | 37.0p |
Is an air fryer actually cheaper than an oven?
Yes against an electric oven for one- and two-person meals, and no against a gas oven or a fully loaded electric one. An air fryer brings 4–6 litres up to temperature; an oven heats 60–70 litres and wants a preheat first. Fill that oven with a family meal and one cycle can still win.
The decisive variable is how much empty space you are heating. Cooking one portion of chips in a 60-litre oven means bringing the whole cavity, its shelves and its door up to temperature for food that occupies a fraction of it. That is why MoneySavingExpert threads land in the same place: for small meals the air fryer wins comfortably, and the gap narrows as the oven fills.
The second variable is fuel. If your oven runs on gas, the comparison flips — UK forum consensus, and the conclusion on our own air fryer hub, is that an air fryer is unlikely to beat a gas oven on running cost regardless of how efficiently it cooks.
“Forum members discussing whether an air fryer beats a full-size fan oven agreed that for someone cooking just for one person, the air fryer works out cheaper to run than firing up the whole oven (paraphrased)”
What wattage do the popular UK air fryers really draw?
The Ninja AF400UK draws 2,470W and the AF300UK 2,400W. Both sit well above the 1,500W average that running-cost calculators assume, and above the 1,000–1,800W band usually quoted for the category. High wattage is not waste — it heats a small drawer quickly, so the cook itself is shorter.
This is where generic cost content misleads people. Every calculator site we checked models a flat 1,500W appliance, then reports about 37p an hour. That is accurate for a compact single-drawer model and wrong by two-thirds for the dual-zone Ninjas that dominate UK recommendations.
The nuance that rescues the dual-zone models is duration. A 2,470W machine reaching 200°C in a 4.75L drawer gets there in a fraction of the time an oven takes, and dual-zone owners cook two components at once rather than running the appliance twice. Peak draw is high; time on is short.
- Ninja Foodi MAX Dual Zone AF400UK — 2,470W, 9.5L across two 4.75L drawers
- Ninja Foodi Dual Zone AF300UK — 2,400W, 7.6L across two 3.8L drawers
- Category range quoted across UK sources — 1,000W to 1,800W, averaging 1,500W
- Cost consequence — every 100W adds about 2.5p per hour at 24.67p per kWh
What does an air fryer cost per hour and per year?
The AF400UK costs 60.9p an hour at 24.67p per kWh. Run for 30 minutes a day it uses 450.8kWh a year, or £111.21. Cut that to 15 minutes a day and it falls to £55.61. A typical 1,500W model at 30 minutes a day works out at £67.53 a year.
Annual figures are the honest way to judge whether the appliance matters to your bill, because half a kilowatt-hour a day sounds trivial and £111 a year does not. The daily-use column is where most households mis-estimate themselves: 30 minutes a day is heavy, everyday use, and the once-or-twice-a-week owner is nearer the 15-minute row divided by three.
Generic calculators quote roughly £71.48 a year for a 1,500W model at 30 minutes a day, slightly above our £67.53 because they assume a marginally higher unit rate. The difference between those two numbers is far smaller than the difference between a 1,500W and a 2,470W machine, which is the point.
| Daily use | AF400UK (2,470W) | AF300UK (2,400W) | Typical 1,500W model |
|---|---|---|---|
| 15 minutes | £55.61 | £54.03 | £33.77 |
| 30 minutes | £111.21 | £108.05 | £67.53 |
| 1 hour | £222.43 | £216.11 | £135.07 |
How long does an air fryer take to pay for itself?
About six months if you buy a £150 air fryer and use it every day in place of the oven. Drop to twice-weekly use and the payback period stretches beyond two years. One PistonHeads owner reached break-even faster by counting the roughly £120 professional oven clean he no longer books.
Payback is entirely a function of frequency, so the honest way to work it out is to divide the purchase price by your own saving rather than by an average. If replacing oven sessions saves you £5 a month — the figure one MoneySavingExpert member actually measured — a £150 machine takes 30 months to pay for itself on energy alone. Use it daily and the saving per session is the same but the sessions multiply.
The second saving is the one most cost articles miss entirely: the oven you stop using is also the oven you stop cleaning. That is a real cash figure for anyone who pays for it.
“One member of a long-running PistonHeads air fryer thread said that after spending £180 on a Ninja AF400, the savings on electricity plus no longer paying around £120 a visit for oven cleaning meant it had already paid for itself (paraphrased)”
When is the oven still the cheaper choice?
When you cook on gas, when you batch-cook a full oven load, and when the meal needs more than 9.5L of drawer space. One oven cycle carrying four trays beats three or four sequential air fryer loads on both energy and time, and occasional users never accumulate enough savings to clear the purchase price.
Batch cooking is the clearest case. Two Ninja drawers hold 9.5L between them; a family Sunday roast with potatoes, vegetables and a joint does not fit, and running the air fryer three times in a row at 60.9p an hour removes its advantage. The appliance is optimised for one or two components at a time.
Frequency is the other case. If the air fryer comes out twice a week for chips, you are saving pennies per session against a purchase price in three figures.
- You have a gas oven — the electricity saving does not translate
- You batch-cook, meal-prep or roast for five or more people
- You would use it once or twice a week, so payback runs to years
- The dish is physically larger than a 4.75L drawer
“Other posters on the same PistonHeads thread said oven chips come out much nicer done in an air fryer than in a regular oven, but cautioned that if you only use it once or twice a week, the energy-saving payback period is very long (paraphrased)”
What happened to UK owners' bills after switching?
One MoneySavingExpert member measured their electricity use dropping by £5 a month — about £60 a year — after replacing five or six weekly oven sessions with an air fryer. Mumsnet owners on the 'worth it' thread report the same direction: spending down because the oven stopped going on for simple meals.
This is the most useful evidence available, because it is a measured before-and-after from a household that changed one variable. It also sets a realistic ceiling. A £5 monthly saving is what a heavy oven user gets back; a household that already cooked on the hob will see far less.
Read the saving as a rebate on convenience rather than a reason to buy. Owners who describe the purchase as worthwhile almost always cite speed and results first, with the bill as a bonus.
“My usage dropped by £5 each month when I bought mines a few months ago. This was the only change in my usage, in that I stopped using the main electric oven which was on 5 or 6 times each week.”
Which air fryer earns its running costs?
We rank five air fryers on what UK owners report in Mumsnet and MoneySavingExpert threads, from the 9.5L Ninja AF400UK down to the £75–£100 AF100UK. Every pick carries the wattage, capacity and owner evidence behind it.
See the best air fryers for 2026 →Frequently asked questions
Is it worth getting an air fryer?
On cost alone, only if you use it most days in place of an electric oven — that is the pattern that turns a £150 purchase into a six-month payback. Twice-weekly users should buy one for speed and results instead, because the energy saving takes years to clear the price.
How much electricity does an air fryer use?
A Ninja AF400UK uses 1.24kWh per half-hour cook at full draw, and 450.8kWh a year if you run it 30 minutes a day. A typical 1,500W model uses 0.75kWh per half hour, or 273.75kWh a year on the same schedule — roughly 40% less.
What size air fryer do I need?
3.8L single-drawer for one or two people, 7.6L dual for two or three, and 9.5L dual for a family of four or more. Sizing up costs slightly more per hour to run, but stops you cooking twice — which is the expensive mistake.