How much does an out-of-stock cost a store?: ShelfAlert

In shortIn France, on-shelf out-of-stocks represent more than a billion euros of lost sales a year for grocery retail, about 45 baskets lost per day and per hypermarket. In front of an empty shelf, one shopper in three buys the product in another store and nearly one in ten leaves with nothing. For a supermarket, each point of out-of-stock rate weighs roughly 0.5 to 1% of turnover.

What an out-of-stock loses

When a product is missing, four things can happen, and only one is painless for the store. The worldwide study by Gruen, Corsten and Bharadwaj, based on 71,000 observations in 29 countries, measured what shoppers do in front of an out-of-stock:

31% buy the product in another store;
26% take another brand;
19% take another size of the same brand;
15% delay the purchase;
9% buy nothing.

For the store, the sale is lost in a little over half of the cases (another store, delay or abandonment). And the shopper who went elsewhere has discovered a competitor. That is the hidden cost: repeated out-of-stocks on everyday products make people change store.

The figures in France

The ECR France / IRI out-of-stock barometer has tracked the shelves of French grocery stores for years. Its orders of magnitude:

an out-of-stock rate between 5 and 8% depending on the banner;
45 baskets lost per day and per hypermarket;
more than 1.4 billion euros of lost sales over twelve months (May 2014 to May 2015);
333 million euros of lost sales in the first quarter of 2022 alone.

Worldwide, IHL Group puts the 2026 cost of “inventory distortion” (out-of-stocks and overstocks) at 1.7 trillion dollars a year, 6.2% of retail sales, of which 691 billion for empty shelves alone.

Estimating the cost for your store

A four-line method, to redo with your own figures:

Daily turnover of the store: say €60,000 for a supermarket.
Out-of-stock rate measured on the shelf: say 7%.
Share of sales really lost when the product is missing: about 55% according to the shopper reactions above (another store, delay, abandonment).
Lost sales: 60,000 × 7% × 55% ≈ €2,300 a day, nearly €700,000 a year.

Going from 7% to 5% out-of-stock, which the best-run stores of a banner achieve, brings the loss down to €1,650 a day: about €240,000 recovered in the year, without one more shopper in the store.

This calculation counts neither the shoppers who get into the habit of going elsewhere, nor the staff time spent answering “we’re out of it”. It gives a floor.

Where the cost hides in the accounts

The lost sales of an out-of-stock appear nowhere: the sale that did not happen is not recorded. That is why the subject gets less attention than shrink, which is visible. Measuring lost sales needs a dedicated method, explained in how to measure sales lost to out-of-stocks.

What shopper reporting changes

Every ShelfAlert report is a dated, located out-of-stock with the product: the manager sees how often a product was missing, at what hours, and what it costs. The alert arrives in real time, so the out-of-stock lasts less. 14-day trial, no payment card: see the plan for store managers.

Sources

Gruen, Corsten, Bharadwaj, “Retail Out-of-Stocks: A Worldwide Examination of Extent, Causes and Consumer Responses”, GMA, 2002: full study (PDF).
ECR France / IRI out-of-stock barometer: LSA, out-of-stock rate and Les Marchés, on-shelf out-of-stocks.
IHL Group, “Inventory Distortion Study”, 2026: study overview.

How much does an out-of-stock cost a store?