Most people who buy an air fryer do it for the cooking, not the electricity bill. Then, a few months in, they notice something. The bills feel slightly lower. Or someone mentions it online, and they start wondering if theirs is actually making a difference. The short answer is yes, it does save energy, but the reason why is not what most people think when they look at the wattage on the box.
The Wattage Comparison That Misleads Almost Everyone
It goes like this. An air fryer uses an average of 1,200 to 1,800 watts of energy. An oven uses an average of 2,000 to 5,000 watts of energy. Quite the difference on paper.
But it is all a matter of wattage, isn’t it? Not really. Time is the other part of the equation – and this is where the savings happen.
There is always preheating when using an electric oven. Fifteen to twenty minutes of using almost full energy capacity without even putting any food in it. And this is what happens in three minutes. Preheating period is pure electricity waste without any food prepared, and nobody counts that when thinking about electricity usage costs.
This is how the picture will look taking into account both factors:
| Condition | Air Fryer | Conventional Oven |
| Typical wattage | 1,200 to 1,800W | 2,000 to 5,000W |
| Preheat time | 2 to 3 minutes | 15 to 20 minutes |
| Average cook time | 15 to 20 minutes | 25 to 40 minutes |
| Approx. cost per session | 7p to 14p | 23p to 48p |
Once you add preheat back into the oven’s session cost, the gap between the two appliances is considerably wider than the wattage figures alone suggest.
What This Looks Like on an Actual Bill
Households using an air fryer consistently instead of the oven four or five times a week can realistically save somewhere between £100 and £130 a year on electricity. That is not a marketing claim. It is a straightforward calculation based on the energy difference per session multiplied across regular use.
The word consistently is doing a lot of work in that sentence, though.
A lot of people buy one and use it alongside existing cooking habits rather than instead of them. The oven still runs for the main meal. It handles the chips or the vegetables on the side. In that pattern you are running two appliances where one used to do the job. The bill goes up, not down. Every saving an air fryer delivers comes from replacing oven cooking, not from simply owning one.
Two Things That Affect Your Running Cost More Than Wattage Does
Temperature is the first one. Cooking at lower settings uses noticeably less electricity than cooking at maximum heat. Most recipes adapted from oven instructions suggest dropping the temperature by 20 to 25 degrees anyway, because the compact chamber and fast air circulation transfer heat more efficiently than a large oven cavity. Lower temperature, same result, lower running cost.
Basket loading is the other one. Fill the basket to around three quarters of its capacity and everything works the way it should. Air circulates properly, cook time stays short, energy per session stays low. Overfill it and the circulation is restricted, the cook takes longer, and the efficiency drops. Underfill it and the full heating element runs for a quantity of food that never needed it.
Neither of these is a dramatic change to how you cook. Together they make a meaningful difference to what the appliance actually costs to run day to day.
For anyone comparing specific models before buying, an air fryer range with wattage and capacity clearly listed makes the running cost calculation for a given household considerably more straightforward.
The Cooking Situations Where the Oven Still Wins
Large meals for large households. That is the honest answer.
A full oven loaded with multiple dishes cooking simultaneously uses less total energy than the same food prepared across two or three consecutive batches. Each round requires the appliance to reheat from scratch, and that repeated cycle adds up. That efficiency advantage is built on short single-load sessions. Push it beyond that and the saving shrinks, and for genuinely large quantities it is gone entirely.
Where it consistently earns its place is weeknight cooking for two or three people. Vegetables, smaller portions, reheated food, quick snacks. These are the sessions where the time saved and the energy saved both show up clearly.
Conclusion
An air fryer does reduce electricity costs, but only when it is actually replacing oven cooking rather than adding to it. The saving comes from skipping the preheat, cutting session length, and working in a smaller more efficient space. Used the right way, the annual reduction is real and builds up quietly over months of regular cooking. Used as an extra appliance on top of everything else, it just adds another line to the bill.