Why nappy prices are so hard to read
Nappies are sold in an unusually wide range of pack counts — small packs, jumbo packs, monthly boxes and retailer-specific counts that don't exist anywhere else. Two packs of the same brand and size can differ by fifty nappies and only a few pounds.
That makes the shelf price nearly useless as a comparison. The number you want is pence per nappy: pack price divided by the number of nappies in the pack, multiplied by 100.
£14.00 for 58 nappies is 24.1p each. £11.00 for 42 is 26.2p each. The cheaper pack is the more expensive nappy.
When bulk actually saves you money
Larger boxes are usually cheaper per nappy, and if you're buying the size your baby is settled in, they're a straightforward win.
The catch is growth. Babies move through the early sizes quickly, and a half-used box of a size they've outgrown is money you've spent rather than saved. Buying deep is safest in the sizes babies stay in for months rather than weeks — and least sensible for newborn sizes.
- Buying deep works best when your baby is mid-way through a size, not about to move up.
- Most brands overlap their weight ranges, so a box bought slightly early usually still gets used.
- Storage matters more than people expect — a monthly box is physically large.
Compare like with like
Nappy ranges are confusing on purpose. The same brand often sells a standard line, a premium line and a night-time line, in overlapping sizes and near-identical packaging. Pull the size and the range name out of the product title before you compare anything.
Also watch pull-up pants versus taped nappies. They're priced differently and are not interchangeable products, even in the same size.
Don't forget the cost of getting them to you
Nappies are bulky, and delivery is where a lot of apparent online savings disappear. A pack that's £2 cheaper with £4.95 postage costs you more than buying it in a shop you were going to anyway.
Compare the all-in cost: item price plus delivery, or the threshold you'd need to hit for free delivery. If you're only buying nappies, that threshold matters.
A comparison routine that takes 30 seconds
- Confirm the brand, range and size match exactly.
- Divide price by nappy count to get pence per nappy.
- Add delivery to the price before dividing, if delivery applies.
- Only then compare — and sanity-check whether you'll actually use the larger pack.