Supermarket price comparison: everyday basics

For each basic we gather the comparable versions at each supermarket, leaving out packs without a declared size, non-food items and extreme values. For each supermarket we show the median price per kilo, litre or item and the cheapest option we found. It isn't always the same product or brand: they're comparable alternatives.

We compare each supermarket's median with that product's median price across all the supermarkets compared and average those differences (geometric mean), with every product weighted the same. 100 would be one charging exactly that median price for everything; 94 means 6% below. It isn't what you'd pay at the till: that depends on what you buy, how much, and on offers.

Not always. We use each supermarket's online shop, which can differ from a particular store because of local offers or a different range. It's a reference for comparing, not a guaranteed price.

They come from the supermarkets' online shops. No data is available right now.