Which Size Is Cheaper? Is the big box actually better value than the small one?

The real price per kilo across every size on the shelf, with multipacks and offers worked out properly — and the question the shelf label never asks, which is whether you'll actually finish the big one.

WHAT YOU GET

- Grams, kilos, ounces, pounds, millilitres, litres and 'each', all compared

- Buy-one-get-one, three-for-two, percent off and N-for-a-fixed-price all handled

- Refuses to compare grams against millilitres, because they aren't the same thing

- Say how much goes in the bin and the ranking changes — often completely

- Points out when the biggest one isn't the cheapest, which is more often than you'd think

HOW IT WORKS

1. Type in what's on the shelf — Price, size and any offer.

2. Say whether you'll use it all — This is where bulk buys stop being bargains.

3. Buy the one at the top — With the percentage it saves you.

One file. Double-click it and it opens in the browser you already have — Chrome, Edge, Safari or Firefox. Nothing to install, no account, no subscription.

Nothing you type ever leaves your computer. There is no server involved, which is why it still works with the wi-fi switched off.

30-day refund, no questions asked.