What it means
Total revenue growth at a retailer or restaurant chain is a mixture of two very different things: existing sites performing better, and simply having more sites. Same-store sales strips out the second so you can see the first, which is why it is often called comparable sales or like-for-like sales.
The distinction matters because opening locations is a way of buying growth with capital, whereas improving existing locations is evidence that the offer itself is working. A chain reporting 12% total growth and -3% same-store sales is expanding into a weakening business, and investors treat that combination as a warning.
Calculating it requires a definition of what counts as comparable. Most chains include only sites that have been trading for at least twelve or thirteen months, exclude any site that was closed for refurbishment for a material period, and exclude closures entirely, so the same set of locations is compared in both periods.
Interpreting the number means separating price from volume. A 5% increase driven by transaction growth is far healthier than the same 5% delivered purely by price rises during a period of inflation, so good disclosure breaks the figure into average transaction value and transaction count.
The measure has spread well beyond physical retail. Chains report comparable sales including or excluding online orders, gyms and clinics use comparable membership revenue, and multi-site service businesses apply the same logic to branches, which makes the definition itself worth reading before comparing two companies.
In practice
Real-world examples.
Example
A supermarket chain reports 4% same-store sales growth but discloses that average basket value rose 6% while transaction numbers fell 2%. Analysts read this as price-led growth with customers visiting less often, and the share price falls despite the positive headline.
Example
A coffee franchise refurbishes 30 of its 200 sites and excludes them from the comparable base for the six months they were partly closed. Including them would have dragged the reported figure down by about a point and disguised a genuine improvement elsewhere.
Example
A fitness chain reports 9% total revenue growth and 1% comparable growth after opening twelve clubs. The board recognises that almost all of the growth came from new capital rather than better performance, and pauses the expansion plan to focus on member retention.
Formula
Calculation
Same-store sales growth = (comparable period sales - prior period sales) / prior period sales, using only locations open in both periods.
A restaurant group ends the year with 68 sites, of which 60 have been trading for more than thirteen months and count as comparable. Those 60 sites generated $189,000,000 this year against $180,000,000 last year, so same-store sales growth is ($189,000,000 - $180,000,000) / $180,000,000 = $9,000,000 / $180,000,000 = 5.0%.
Total company sales tell a different story. This year's total is $205,000,000, made up of the $189,000,000 from comparable sites plus $16,000,000 from 8 new openings, an average of $16,000,000 / 8 = $2,000,000 per new site. Last year's total was $186,000,000, being the $180,000,000 comparable figure plus $6,000,000 from sites since closed. Total growth is therefore ($205,000,000 - $186,000,000) / $186,000,000 = 10.2%, roughly double the underlying 5.0% same-store figure.Case study
Seen in the real world.
Fernway Market is an invented grocery chain used purely as an illustrative example. Over three years it grew total revenue from $186,000,000 to $205,000,000 and the management team presented that 10.2% increase to its lenders as evidence of a strengthening business.
The lender's analyst asked for the comparable figure instead. Stripping out the 8 new stores and the sites closed during the period, the 60 comparable stores had grown from $180,000,000 to $189,000,000, or 5.0%, and almost all of that came from price increases rather than more customers through the door. Each new store had cost roughly $2,400,000 to open and was generating $2,000,000 of first-year sales.
In this fictional case the conversation changed the strategy rather than the funding. Fernway slowed openings to three a year, redirected capital into refreshing its oldest twenty stores, and began reporting same-store sales split between transaction count and average basket at every board meeting. The illustrative point is that total growth and underlying growth answer different questions, and only one of them tells you whether the business is actually getting better.
Watch out
Common mistakes.
- Quoting total revenue growth as though it showed the business improving, when most of the increase came from opening new locations funded by fresh capital.
- Ignoring the definition of comparable. Companies choose their own cut-off period and refurbishment rules, so two chains' figures are not automatically comparable with each other.
- Reading a positive number as good news without separating price from volume, since inflation alone can produce growth while customer numbers fall.
Questions
People also ask.
Why do chains exclude new stores from the calculation?
Because a store's first year includes an opening surge and no prior year to compare against, which would make the growth figure meaningless.
Is negative same-store sales always a problem?
Not always, since a deliberate move away from heavy discounting can reduce sales while improving profit, but it should always come with an explanation.
Should online sales be included?
It depends on the business, and the honest approach is to disclose the figure both ways, because online orders collected in store can otherwise be counted where they flatter the number most.
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