In this article
An air fryer is usually cheaper to run than a full-size electric oven for small portions and quick meals. The saving is not automatic, though. It depends on the wattage of each appliance, how long it runs, whether the oven needs preheating, and how much food you are cooking at once.
For a single portion of chips, chicken, vegetables or reheated leftovers, the air fryer normally has the advantage because it heats a smaller space and often cooks faster. For several trays of food, batch baking or a family roast, the oven can still make more sense because one larger cook may be more efficient than squeezing food into several air-fryer rounds.
Quick answer
| Cooking job | Likely cheaper option | Why |
|---|---|---|
| One or two portions of chips, nuggets or vegetables | Air fryer | Smaller cooking chamber, usually shorter running time and little or no preheat. |
| A tray bake for several people | Often oven | The oven can cook more food at once instead of using several air-fryer batches. |
| Reheating pizza, pastries or leftovers | Air fryer | Short cook times make the oven's warm-up period harder to justify. |
| A large roast, cake or full oven meal | Oven | Capacity, heat distribution and shelf space matter more than appliance size. |
| Using a gas oven | It depends | Gas and electricity are priced differently, so compare your actual tariff and cook time. |
For running costs, the winner is rarely the appliance with the lowest wattage on the box. It is the appliance that cooks your actual meal properly in the shortest sensible run.
The practical rule is simple: use the smallest appliance that can cook the food properly in one sensible batch. That is often an air fryer for everyday portions, but not always for bigger meals.
Already leaning towards the smaller appliance? Compare our best air fryers first. If you need more oven-style shelf space, our mini oven and indoor grill guides may be better starting points.
The simple running-cost maths
To estimate any electric cooking cost, use this formula:
watts ÷ 1,000 × hours used × electricity unit rate = approximate running cost
Ofgem's average Direct Debit electricity unit rate for 1 July to 30 September 2026 is 26.11p per kWh. Your own unit rate may be different, but this is a useful current benchmark for UK examples.
Example: small weekday portion
- 1,500W air fryer for 20 minutes: roughly 13p.
- 2,500W electric oven for 45 minutes: roughly 49p.
That is the kind of meal where an air fryer can look obviously cheaper: a small load, a shorter cook and little wasted heated space.
Example: larger family cook
- 1,700W air fryer for 35 minutes: roughly 26p.
- 2,500W electric oven for 60 minutes: roughly 65p.
The air fryer still looks cheaper in this simple example. But if the oven cooks a whole meal in one go while the air fryer needs two or three separate batches, the gap narrows quickly. The cheapest appliance is the one that finishes the job without overcrowding, undercooking or forcing a second run.
Why air fryers often cost less
An air fryer is essentially a small, fast fan oven. Its running-cost advantage usually comes from three things:
- Less space to heat: the cooking chamber is much smaller than a full oven cavity.
- Shorter cook times: fast airflow can crisp small portions more quickly than a conventional oven.
- Little preheating: many air-fryer meals can go straight in, or need only a short warm-up.
Those advantages matter most when the food fits comfortably in the basket or drawer. Overfill an air fryer and you may lose the crisping, extend the cooking time or need to shake and split the food into batches.
When the oven can still be the better value
The oven starts to fight back when capacity matters. A full-size oven may use more power while it is running, but it also gives you shelves, trays and space. If you are cooking for a family, baking, roasting a joint or preparing several parts of a meal together, one oven session can be more practical than several air-fryer rounds.
Gas ovens also change the comparison. Gas unit prices are normally lower than electricity unit prices, but gas ovens vary in efficiency and still take time to heat a larger cavity. If you mainly use a gas oven, do not assume an electric air fryer will always be cheaper without checking your tariff and the way you cook.
Is an air fryer worth buying just to save energy?
For most households, the stronger reason to buy an air fryer is cheaper everyday cooking plus convenience, not running-cost savings alone. If you spend £80 on an air fryer and save 25p on a meal, you would need hundreds of similar cooks before the appliance pays for itself on electricity alone.
An air fryer makes more sense if several of these are true:
- you often cook one or two portions;
- you reheat leftovers, snacks or freezer food regularly;
- you avoid using the oven because it feels wasteful for small meals;
- you want faster weeknight cooking as well as a lower running cost;
- you have enough worktop or cupboard space for another appliance.
If you mostly cook large meals, bake regularly, or already use your oven efficiently by filling multiple shelves, the saving may be modest. In that case, a larger dual-zone air fryer or air-fryer oven might be more useful than a compact single basket, but it will also cost more to buy and take up more room.
How to compare your own appliances
- Check the wattage on the rating plate, manual or retailer specification.
- Estimate the real cooking time, including oven preheating if you normally preheat.
- Use your electricity unit rate, not just the national average.
- Compare one complete meal, not one appliance run if the air fryer needs multiple batches.
For a quick rule of thumb, a 1,500W appliance costs about 39p per hour at 26.11p/kWh. A 2,500W appliance costs about 65p per hour at the same unit rate. Shorter cooking time is what makes the air fryer compelling: the difference is much bigger over 20 minutes than over a long, repeated batch cook.
Verdict: cheaper for small meals, not a magic saving
An air fryer is normally the cheaper appliance for small portions, quick freezer food, reheating and everyday meals where a full oven would be mostly empty. The oven is still the better tool for big batches, baking and meals that need proper tray or shelf space.
If you are buying one mainly to cut running costs, choose the size carefully. A basket that is too small can force repeat batches; a model that is too large can cost more upfront and use more energy than you need. The best buy is the smallest air fryer that comfortably handles the meals you cook most often.
Ready to compare models? Start with our best air fryers guide, where we focus on practical capacity, everyday usability and value rather than headline wattage alone.
Sources and checks
These links help you check the current energy-rate assumptions behind the worked examples.
- Ofgem energy price cap unit rates and standing charges - check the current electricity unit-rate benchmark and regional differences.
- Ofgem price cap and standing charges explained - understand why bills depend on your unit rate, standing charge, payment method and actual energy use.
