How do I compare nappy prices properly?

Divide the price by the number in the pack. Pack sizes do not line up between brands, sizes or shops, so price per nappy is the only comparable figure — and it often reverses which looked cheaper.

Is the bigger box always cheaper?

No. Frequently yes, sometimes not, and the only way to know is to do the division. Bigger packaging is not a guarantee of better value.

Should I bulk buy nappies?

Within the size you are currently using, yes. Buying ahead into the next size regularly leaves you with unopened packs your baby has outgrown.

Cheapest place to buy nappies in the UK

There is one number that matters and it is not on the front of the box.

Updated 25 September 2026 · 1 min read

Price per nappy, every time

Nappies are sold in pack sizes that do not line up between brands, between sizes, or between shops — jumbo, mega, monthly boxes, each with a different count. Headline prices are therefore close to meaningless.

Divide the price by the number of nappies in the pack. That single number makes the whole category comparable, and it routinely reverses which option looked cheaper.

Sizes change faster than you expect

Bulk-buying is the standard advice and it has a real limit: a baby moves up a size and leaves you with an unopened month of the last one. Buy in bulk within the size you are currently using, not ahead of it.

What actually drives the price

Price per nappy. The only comparable figure.
Own-brand versus branded, which in this category is a genuine and large saving many people never test.
Subscription discounts, real but usually locking you into a pack size.
Baby-event promotions at the big pharmacies, which are among the few genuinely large discounts in the category.

Before you buy

Convert every option to price per nappy.
Try one own-brand pack before committing to a brand for years.
Do not bulk-buy ahead of the current size.
Check the big pharmacy promotional events before a large order.