Air fryer capacity is measured in litres, but litres don't mean much until you translate them into portions. Here's how to match the size to your household — and whether a dual-basket model is worth it.
Key takeaways
Q: What size air fryer do I need?
A: Roughly 3–4L for 1–2 people, 4–6L for 3–4, and 6L+ or dual-basket for families of 4+.
Q: Is a bigger air fryer always better?
A: No — a too-large model wastes energy and counter space for small households. Match the size to how you actually cook.
Litres to people
| Capacity | Best for |
|---|---|
| 2–3.5L | 1–2 people, sides, small kitchens |
| 4–5.5L | 2–3 people, everyday cooking |
| 6–8L | 4+ people, whole chicken |
| 9L+ / dual | Families, batch cooking, full meals |
Single vs dual basket
A single basket is simpler, cheaper and fine for most. A dual basket cooks two things at different temperatures at once — brilliant for getting a main and a side ready together, as in our roast dinner guide — but it costs more and takes more space.
How to choose
- Count your usual portions, not the maximum you might ever cook.
- Check the basket dimensions if you want to fit a whole chicken or pizza.
- Mind your worktop — bigger units have a real footprint.
- Running costs scale with size — see how much electricity an air fryer uses.
Frequently asked questions
What size air fryer is best for a family of 4?
A 6–8L single basket or a dual-basket model works well for four — enough for a main and sides, or a whole chicken.
Is a 4L air fryer big enough?
For 1–2 people, yes — it handles everyday cooking and sides. For three or more, look at 5.5L and up.
Are dual-basket air fryers worth it?
If you regularly cook a main and a side together, yes — two zones at different temperatures finish at the same time. For simple cooking, a single basket is fine.