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What size air fryer do you actually need?

You are about to buy an air fryer and every listing quotes a litre figure that means nothing until you know how many portions it actually holds.

Research-based picks, not lab-tested · how we choose · always confirm price and availability on Amazon before buying

The callHow many people you are cooking for most nights, and whether that calls for one basket or two.

  1. Best for one or two people Ninja Air Fryer AF100UK
  2. Best for four or more Ninja Foodi Dual Zone AF300UK

Not tested by us — researched. Every pick below states its drawback too.

The litre number on the box is the least useful thing on it. A "5.5L" single-drawer fryer and a "7.6L" dual-zone model can end up feeding roughly the same number of people, because a chunk of a dual-zone’s headline figure is two baskets that never combine into one meal. The number that actually matters is portions per basket, and that scales with household size in a fairly predictable way. Below is the general shape of that decision, plus what we would buy at each end of it — if you already know you are cooking for two, or for four, we have gone deeper on those specifically.

What we weighed

  • Litre capacity translated into real portions, not the marketing figure
  • Whether one basket (used twice) beats two smaller drawers for your household
  • Worktop and cupboard footprint at each size band, the most common buying regret
  • How much cooking-in-batches you are realistically willing to do on a weeknight
  • Published specifications, customer feedback patterns, warranty terms and professional reviews

Our picks

  1. Ninja Air Fryer AF100UK

    Best for one or two people
    Research-based pick how we choose

    A single 3.8L drawer, sized so two full portions fit without crowding. Dial controls, no app, no menu to learn.

    Who it’s for: Households of one or two eating a normal portion most nights.

    Worth knowing: One drawer means sides and mains finish separately if you want both hot together, and there is no second zone for the occasional bigger batch.

    • Right-sized for one or two
    • Simple dial controls
    • Smaller worktop footprint than dual-zone models
    Find the Ninja Air Fryer AF100UK on Amazon

  2. Ninja Foodi Dual Zone AF300UK

    Best for four or more
    Research-based pick how we choose

    Two independent drawers mean the chips and the chicken finish at the same time, which is the single thing most air fryers get wrong. Bulky on a small worktop — measure before you buy.

    Who it’s for: Households of four or more, or anyone who regularly needs two different things to finish at the same time.

    Worth knowing: It is big. On a small worktop it dominates, and it is the pick most often returned for size rather than performance — measure first.

    • Two zones, one finish time
    • Genuinely large capacity
    • Dishwasher-safe baskets
    Find the Ninja Foodi Dual Zone AF300UK on Amazon

We have not physically tested these products. Picks are chosen by researching published specifications, customer feedback, warranty and support terms, and professional reviews — the labels above (“Best overall”, “Best value”) are our recommendation, not a score from a rating system. Read how we choose. Each button opens an Amazon UK search for that exact model rather than a fixed product page, so the link keeps working when Amazon changes or replaces a listing — check the price, seller and delivery on Amazon before buying.

Common questions

How many litres of air fryer do I need per person?
As a rough guide, plan on 1.5–2L of usable drawer capacity per adult portion. That puts one or two people at roughly 3.5–4L total (a single basket), and four or more at 7–9L, which in practice means a dual-drawer model rather than one large basket.
Should I just buy the biggest one I can find?
No — bigger baskets take longer to come up to temperature, take up more worktop and cupboard space, and cooking a small portion in an oversized basket tends to give worse, less even results than a basket that is closer to full. Size to your household, not to "just in case".
Have you tested these?
No. We have not bought or used these products. These picks come from published specifications, patterns in customer feedback, warranty and support terms, and professional reviews from publications that do test. We say so rather than letting you assume otherwise.

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