Allsupers
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Local preview. This edition is not yet published — the national-brand basket below is a preview build, not the final figures.

Allsupers Pricemonitor — edition 2026-05

Monthly pricemonitor for UK supermarkets: price development per supermarket, the national-brand basket and the own-label basket.

In brief

  • UK supermarket prices have been broadly flat since the June 2026 baseline.
  • On own-label products, Aldi has the lowest measured basket price.

Independent research · Not sponsored · Based on measured online prices

Price development per supermarket

Since April the Allsupers total index has risen -0.6% lower on average.

Highest level: Sainsbury's +1.1%.

Lowest level: Waitrose -2.8%.

The index starts at 100. A level of 100.5 means 0.5% dearer than the start month.

Show period:

By default we show total, biggest riser and biggest faller. Click a supermarket to show its line.

  • Total-0.6%

Own-label basket price level

  • Aldi and ASDA are the cheapest on own-label.
  • Waitrose is the highest in this measurement: 65.7% above the cheapest.
  • Because margins overlap, not every position is a hard ranking.
Showing all categories together.
  1. Lowest price level in this comparison
    Index 100 = cheapest measured own-label basket.
    Because of the uncertainty margin, shops with overlapping margins can be practically comparable.
  2. Estimated price difference vs the cheapest
    This supermarket is on average +24.8% dearer.
    Allowing for the uncertainty margin, the difference lies between +19.9% and +29.8%.
  3. Estimated price difference vs the cheapest
    This supermarket is on average +29.2% dearer.
    Allowing for the uncertainty margin, the difference lies between +25.0% and +33.7%.
  4. Estimated price difference vs the cheapest
    This supermarket is on average +29.3% dearer.
    Allowing for the uncertainty margin, the difference lies between +25.1% and +33.8%.
  5. Estimated price difference vs the cheapest
    This supermarket is on average +33.5% dearer.
    Allowing for the uncertainty margin, the difference lies between +29.2% and +38.2%.
  6. Estimated price difference vs the cheapest
    This supermarket is on average +50.7% dearer.
    Allowing for the uncertainty margin, the difference lies between +45.4% and +57.8%.
  7. Estimated price difference vs the cheapest
    This supermarket is on average +65.7% dearer.
    Allowing for the uncertainty margin, the difference lies between +60.8% and +72.8%.
The light bar shows the uncertainty margin. When margins overlap, the order is not firm.

Compared, but not firmly ranked

These supermarkets cover too little of the basket (or their figure is statistically too uncertain) to rank fairly — they are shown with their coverage.

  • Iceland logoIcelandindex 125.6(missing: Fish, Food products n.e.c., Household goods, Personal care, Sugar, jam, confectionery)
How should I read this?

What does this measure?

  • This basket compares the price level of own-label and unbranded products. National brands do not count here.
  • The cheapest shop in this comparison is set to index 100. The other shops show how many per cent dearer they are on average.

How do we compare fairly?

  • Own-label products are not always exactly the same product. So we compare products that are sufficiently comparable: the same product type, comparable size and comparable function.
    • own-label semi-skimmed milk 1 L ↔ own-label semi-skimmed milk 1 L
    • own-label peanut butter 350 g ↔ own-label peanut butter 350 g
    • Small size differences ↔ normalised to price per litre/kilo
    • Not: butter ↔ margarine, organic ↔ standard, foot spray ↔ flea treatment

What does the margin mean?

  • The light bar shows the uncertainty margin. When margins overlap, shops are close together. The order is then an indication, not a hard ranking.

How thorough is this?

  • We compare all the supermarkets studied against one another on shared and comparable products. Categories count with a fixed weighting, so that one large category does not weigh too heavily.

What does this not say?

  • This is no guarantee that every individual own-label product is cheapest at the lowest-scoring shop. It is a comparison of the average price level within the own-label basket.
  • Because own-label products are comparable but not identical, the percentages are mainly intended as a price-level indication.

Why are some shops missing?

  • Shops such as Iceland and Co-op join from the August edition — they onboarded in July, so there is no matched pair yet.
See the product pairs behind the own-label comparison

These are the products behind the comparison, not a second ranking — the reliable “who is cheaper” answer is the price-level index above (with its confidence margins). Each cell is how much dearer (red, +) or cheaper (green, −) the row retailer (on the left) is per unit than the column retailer, across every matched product, weighted by shopping-basket category the same way the index is. Click a cell to download the actual products, prices and per-unit ratios behind it.

ASDA logoASDATesco logoTescoSainsbury's logoSainsbury'sMorrisons logoMorrisonsWaitrose logoWaitroseIceland logoIcelandCo-op logoCo-opAldi logoAldi
ASDA logoASDA−2.2%−2.0%−1.3%−19.0%−1.0%−20.4%+24.8%
Tesco logoTesco+2.3%0%+2.2%−18.8%+2.2%−15.1%+27.9%
Sainsbury's logoSainsbury's+2.0%0%0%−12.9%too few shared products — see the ranking−11.5%+19.6%
Morrisons logoMorrisons+1.3%−2.2%0%−13.6%+4.2%−12.5%+23.2%
Waitrose logoWaitrose+23.4%+23.1%+14.8%+15.8%too few shared products — see the ranking−0.7%+50.0%
Iceland logoIceland+1.0%−2.2%too few shared products — see the ranking−4.0%too few shared products — see the rankingtoo few shared products — see the ranking+25.0%
Co-op logoCo-op+25.6%+17.8%+13.0%+14.3%+0.7%too few shared products — see the ranking+49.1%
Aldi logoAldi−19.9%−21.8%−16.4%−18.8%−33.3%−20.0%−32.9%

Preview build — each cell is the category-weighted median across all matched own-label products between the two shops; the downloaded file lists them with data-quality flags. The published matrix will show the arbiter-validated set.