Irish Grocery Inflation Tracker — May 2026 Edition

Last updated: 8 May 2026 · Window: Apr 6 – May 4, 2026 · Stores covered: Tesco · SuperValu · Dunnes Stores · Aldi · Lidl · Method: MasterMarket live scrape, validated, weekly-median prices

There is one number that shoppers in Ireland keep hearing on the news — "grocery inflation is X%" — and there is the number that actually shows up at the till on a Saturday afternoon. They are rarely the same number. Headline CPI averages thousands of items into a single percentage; your weekly shop is fifty specific products at one specific store on one specific date.

This tracker measures the second one. It uses 44,229 verified price points across 3,343 distinct products across all five Irish supermarkets, captured weekly from 6 April to 4 May 2026, and tells you exactly which prices moved, by how much, and where. No averages of averages. No "essentials basket" cherry-picked to support a narrative. Just the numbers.

The headline story for May 2026, in one sentence: the median Irish grocery price is flat (0% week-on-week) across all five stores — but the mean swings from +6.18% at SuperValu to −1.47% at Dunnes Stores, because a small tail of Clubcard / Real Rewards cycling drags the average around. Most prices aren't moving. The few that do, move big.

How this tracker works

Every Sunday at 02:00 UTC we re-scrape weekly-promotion pages and per-store catalogues for Tesco, SuperValu, Dunnes Stores, Aldi and Lidl. Each captured price is tied to a product, a store, and a timestamp. We then group every product+store pair by ISO week and take the weekly median of all prices captured in that week. Median, not mean — so a single bad scrape (€999 typo, €0.01 multi-buy clip) cannot poison a week's reading.

For inflation maths, we compare each product's weekly median against itself across two windows:

• Week-on-week (WoW): the most recent two completed weeks (here: 27 Apr → 4 May 2026).
• Four-week (4W): the same product's weekly median four weeks ago vs now (here: 6 Apr → 4 May 2026).

We exclude products priced under €1.00 from the percentage maths (small rounding can show as 50% movement when nothing real changed) and we report mean and median separately, because they tell different stories — see "Why mean isn't median" below.

The headline: 4-week price movement, by store

Source: MasterMarket live database. Weekly-median prices, products with weekly median ≥ €1.00 in both Apr 6 and May 4 weeks.

A few things to call out, because they are not obvious:

• The median is zero everywhere. Across all five stores, more than 60% of tracked products had the exact same weekly-median price four weeks apart. That is the actual experience of an Irish shopper buying the same brand of pasta or hand soap week after week — most prices simply don't change.
• SuperValu's +6.18% mean is real but distorted by the long tail. Of 1,454 tracked SuperValu SKUs, 271 went up and 244 went down. The bias is mild. What pushes the mean to +6.18% is a small group of branded items — particularly Avonmore, Pedigree, Benecol, Ballygowan and 7Up — that came off Real Rewards multibuy and reverted to shelf prices.
• Dunnes Stores is the only store currently posting a negative mean. −1.47% over four weeks reflects a stronger run of multi-buys post-Easter (47 up vs 92 down — almost 2:1 weighted toward decreases). That's a real consumer story, not a methodology artefact.
• Aldi and Lidl are the boring ones, and that's the entire point. Aldi: 180 SKUs tracked, only 17 changed price in four weeks. Lidl: 40 SKUs tracked, only 5 changed. The German discounter playbook is flat shelf prices, few promotions, low variance. The data is exactly what you'd expect — almost no movement either direction.

Top 10 sustained price increases (4 weeks)

These are products whose weekly median actually rose between 6 April and 4 May 2026, and which had a continuous reading across all five tracked weeks (so we know it isn't a Clubcard cycle artefact — see methodology). Sorted by percentage increase:

A few honest caveats on this table:

• A 28% jump on Avonmore butter is real, but it's not "butter inflation." Dairy commodity inflation across the EU has been ~6–8% YoY in 2026. The remaining 20%+ on this specific SKU is the Tesco shelf reverting to non-Clubcard pricing after a multi-week promotion ended. The same butter at Aldi and Lidl moved 0% over the same four weeks. Same dairy, same farms, same euros — different store strategy.
• Branded grocery is where almost all of the "inflation" lives. All ten of the top sustained-increase SKUs are branded products at Tesco or SuperValu — i.e. they are the SKUs where Clubcard / Real Rewards membership pricing creates a wide gap between member and non-member shelf reads. Own-brand and Aldi/Lidl-equivalent SKUs are almost completely absent from the top-movers list.
• WaterWipes 60×9 is a bulk format. Per-pack maths: €28.49 ÷ 9 = €3.17 per 60-pack vs €22.00 ÷ 9 = €2.44 four weeks earlier. Still a real ~30% increase per pack, but the bulk format makes the headline number look scarier than the unit change. Always check the unit price.

Why mean isn't median (and why it matters)

The single most important fact in this tracker is the gap between the mean column and the median column above. They look like the same idea — "the average price change" — but they're answering different questions, and Irish supermarket pricing is unusually good at making them disagree:

• Median 0% says: "the typical product on the shelf, this week, costs the same as it did four weeks ago."
• Mean +6% says: "if you treat every product as one entry on a list and take the average of their percentage changes, it skews positive."

Both are true at the same time, because Irish supermarket shelves are a mixture of two very different pricing systems running in parallel:

1. Flat-shelf pricing — Aldi, Lidl, and a large chunk of every store's own-brand. Set a price, leave it. Boring, predictable, dominates the median.
2. Cycling promotion pricing — Clubcard at Tesco, Real Rewards at SuperValu, weekly multi-buys at Dunnes. The "real" price flips between member-only / multi-buy / regular every 1–4 weeks. When a promo ends, that one product can show as +50% to +100% week-on-week, which it technically is — but only relative to the promo week, not the long-run shelf price.

So when you read a CPI number that says "Irish grocery inflation is 4% YoY", it is mostly capturing system 1 — the flat-shelf prices that genuinely creep up about 4–6% per year. When you read a tabloid "shopping costs 12% more!" it is usually catching system 2 — a few products coming off promo at the moment they snapshot the basket. Both are real measurements. Neither captures the shopping experience on its own.

The fix, for any honest inflation read: look at the median for the typical-shopper signal, look at the list of sustained 4-week movers for the dramatic-but-narrow signal, and look at per-store mean for which retailer is currently leaning more expensive vs cheaper at the till.

What this means for your weekly shop

If you take one practical takeaway from this tracker, take this:

The cheapest weekly shop in Ireland in May 2026 is not the same store it was in April 2026 — but only for about 4–6% of the products you buy. For the other 94–96%, picking a store on price is a question of brand range, not inflation.

That is why we built MasterMarket: so you can check, before you go, which of those 4–6% prices have moved at your stores for your shopping list. The full list of weekly movers, per store, lives behind the Compare Supermarket Prices in Ireland pillar guide. For the practical "how do I cut €100/month off my actual weekly bill" version, see How to Save €100/Month on Groceries in Ireland. And for the longer story on what an Irish weekly shop currently costs across the five stores, Average Cost of a Weekly Shop in Ireland has the basket-level numbers.

What we'll be watching next

• Dairy commodity prices. The Avonmore / Charleville moves above are partly cyclic, partly structural. If May → June carries a sustained increase across own-brand butter and milk too, the headline shifts from "Clubcard cycling" to "real dairy inflation".
• Aldi and Lidl post-summer. Both run their largest weekly-rotating ranges from June onward. The current near-zero variance is a low-rotation-period reading. We expect this to widen once the seasonal Specialbuys / Lidl Surprises ramp back up.
• Dunnes multi-buy density. Right now Dunnes is the only store posting a negative mean. If May/June hold, that's a competitive-strategy signal worth paying attention to.

We re-pull this tracker every Sunday and refresh the public version weekly. Bookmark the page and check back — and if you'd like the underlying per-product data refreshed daily, that's what the MasterMarket app does for free.

FAQs

How is "Irish grocery inflation" different from CPI grocery inflation?

The Central Statistics Office (CSO) measures grocery CPI by tracking ~600 representative products across a fixed national basket. Their methodology averages out store-level differences and weights products by national consumption share. Our tracker is store-, product- and SKU-level: every reading is a specific product at a specific store on a specific date. The CSO answers "how is grocery inflation in Ireland trending nationally?" Our tracker answers "did that specific tin of beans at my Tesco go up?"

Why is your SuperValu mean so much higher than Tesco's?

Three reasons. (1) SuperValu has a wider tracked range (1,454 SKUs vs 924), so we capture more long-tail branded SKUs that are sensitive to Real Rewards cycling. (2) Real Rewards multi-buys frequently use 3-for-2 or "Buy any 2 for €5" structures, which create larger per-SKU price swings than Tesco Clubcard's typical 10–25% member-only price. (3) Some specific Irish brand pricing — Avonmore, Charleville, Ballygowan — happened to move on the same week we sampled. None of these are "SuperValu is putting prices up faster than Tesco" in a structural sense; they're sampling artefacts of the cycle. Watch the median (both 0%) for the structural read.

Why does Aldi look so flat?

Aldi runs a deliberate flat-shelf-price model — relatively few promotions, prices held for long periods. Of 180 tracked Aldi SKUs over 4 weeks, only 17 changed price at all (10 down, 7 up). Lidl is similar: 5 changed prices out of 40 tracked. This is a feature of the German discounter format, not a problem with the data. If anything, the absence of churn is the story.

Are these prices Clubcard or non-Clubcard?

Both, depending on what was scraped on a given day. Our public scrape captures whatever the storefront shows to a non-logged-in shopper, so for Tesco that includes Clubcard prices labelled as such, and for SuperValu it includes Real Rewards prices labelled as such. When we report a weekly median, it's the median of whatever was on the shelf that week — which is in fact what shoppers see. The sustained 4-week movers list filters out single-week Clubcard cycle artefacts by requiring continuous readings across all five weeks.

How often is this tracker updated?

The underlying scrape runs weekly (every Sunday 02:00 UTC). The public page on MasterMarket is regenerated each Monday with the latest week appended. Expect this Brief 10 article to refresh monthly with a new headline window; the underlying data API on MasterMarket is updated weekly.

Where can I see the data behind these numbers?

MasterMarket is free to use. Search any product, see its price across all five tracked stores, and see the full price history per store. We also provide a public sitemap of every tracked product at mastermarketapp.com/products. If you'd like the raw CSV for research / journalism, contact us — we share it gladly with anyone making honest reporting.

Internal links: Compare Supermarket Prices in Ireland (pillar) · Average Cost of a Weekly Shop in Ireland · How to Save €100/Month on Groceries in Ireland · Milk Prices in Ireland