Merchants read a single sitewide conversion number or a single average open rate and assume it describes their store, when the underlying reports actually split by price band and by performance tier, so the average alone misleads.
Most merchants read one number from a vendor report and assume it applies to their store as it stands, but the reports themselves are built from segments, ranges, and sometimes two versions of the same figure sitting in the same release. The Census Bureau’s own quarterly e-commerce report contains two different year-over-year growth numbers. Shopify’s conversion guidance explicitly warns against reading a single sitewide rate. Brevo’s open rate table separates an average from a top decile that is more than double it. None of that is a data quality problem to fix before using the numbers. It is the shape of the numbers, and reading past it is where most benchmark comparisons go wrong.
The Census Bureau released its quarterly retail e-commerce sales report on Tuesday, August 18, 2026, filed as CB26-133. Inside that release, e-commerce sales are compared against the first quarter of 2026 with two separate percentage changes noted: 0.4 percent and 0.2 percent. Total retail sales, a broader category than e-commerce alone, are compared against the second quarter of 2025 with two figures as well: an increase of 6.7 percent in one passage and 6.6 percent in another. These numbers come from the same document, read on September 10, 2026, and the two total retail figures do not resolve to a single consensus number within the release itself. A merchant asking “is the market growing faster or slower than last quarter” needs to specify which comparison, sequential or annual, and which category, e-commerce or total retail, before the answer means anything.
Shopify’s benchmark guide walks through conversion rate with a plain example: out of 1,000 visits, 50 lead to an order, and 50 divided by 1,000 comes out to 5 percent. That example is presented to teach the mechanics of the calculation, not to set a target. The same guide then tells merchants not to stop at a single sitewide number and instead to segment orders by price range, giving three bands as an example: under $50, $50 to $200, and above $200. A store with most of its catalog under $50 will naturally see a different visit-to-purchase pattern than one selling mostly items above $200, because the decision cost is different at each price point. Treating 5 percent as a universal benchmark ignores the fact that Shopify’s own guidance frames it as one output of one example, not a market standard.
Brevo’s benchmark table lists email marketing averages against a top 10 percent figure for the senders it tracks. The average open rate sits at 20.73 percent, while the top 10 percent of performers reach 44.02 percent. That is a difference of more than twenty percentage points, meaning the best decile of senders is opening at more than double the average rate. A merchant checking their own open rate against “the average” is really checking against the middle of a wide spread, and the top decile shows how much room exists above that middle. The table does not include facts on what separates the top decile from the average here, so this article states the gap and leaves the cause open rather than guessing at send frequency, list hygiene, or subject line practice.
| Metric | Reported figure | Source detail |
|---|---|---|
| E-commerce sales, change from Q1 2026 | 0.4 percent | Census Bureau CB26-133 |
| E-commerce sales, change from Q1 2026 (second figure) | 0.2 percent | Census Bureau CB26-133 |
| Total retail sales, change from Q2 2025 | 6.7 percent | Census Bureau CB26-133 |
| Total retail sales, change from Q2 2025 (second figure) | 6.6 percent | Census Bureau CB26-133 |
| Example sitewide conversion rate | 5 percent | Shopify conversion benchmark guide |
| Email open rate, average | 20.73 percent | Brevo benchmark table |
| Email open rate, top 10 percent | 44.02 percent | Brevo benchmark table |
None of these three sources were built to be compared against each other, and none of them claim to measure the same thing. The Census figures track dollar volume across the entire US retail sector. Shopify’s conversion example is a mechanical illustration meant to be applied to a merchant’s own segmented data. Brevo’s open rate table tracks sender behavior across whatever population it covers, split into an average and a top decile. Lined up together, they show that even government data can carry two figures for the same comparison in one release, and that vendor guidance often warns against the very single-number reading merchants default to. The Census figures come from CB26-133 as released August 18, 2026 and checked September 10, 2026, the conversion figures come from Shopify’s published benchmark guide checked the same date, and the open rate figures come from Brevo’s benchmark table checked the same date.
A merchant reading any single benchmark number this quarter should first check whether the source itself offers a segmented or repeated version of that figure, and then compare their own store against the segment that actually matches their price band or sender tier rather than the flat average.
The Census Bureau's quarterly release, dated August 18, 2026 and numbered CB26-133, contains two different year-over-year figures for total retail sales growth from the second quarter of 2025: 6.7 percent in one passage and 6.6 percent in another. Both numbers appear in the same document, so the discrepancy is in the source itself rather than in how this article read it. E-commerce sales are reported separately from total retail sales in the same release, with quarter-over-quarter changes of 0.4 percent and 0.2 percent noted against the first quarter of 2026. Merchants comparing their own growth to the market should treat the 6.6 to 6.7 percent range as the reported band rather than pick one number as definitive.
Shopify's own worked example defines 5 percent as the result of 50 orders out of 1,000 visits, which is presented as an illustration of how the math works rather than as a target every store should hit. Shopify explicitly recommends against judging a store by a single sitewide conversion number and instead suggests segmenting orders by price range, for example under $50, $50 to $200, and above $200. A store selling mostly items under $50 will see different visit-to-order patterns than one selling mostly items above $200, so the 5 percent figure only means something once it is read against the store's own price mix.
Brevo's benchmark table lists an average open rate of 20.73 percent across the senders it tracks, with the top 10 percent of performers reaching 44.02 percent. That gap of more than twenty percentage points between the average and the top decile means a store sitting near the average has meaningful room to move before it approaches what the best senders achieve. The table does not break the average down by industry or list size in the facts available here, so a merchant should treat 20.73 percent as a general floor and 44.02 percent as the ceiling worth aiming toward, rather than as a range that already accounts for their specific category.
The Census Bureau's release itself compares the second quarter of 2026 against both the first quarter of 2026, with e-commerce changes of 0.4 percent and 0.2 percent, and against the second quarter of 2025, with total retail changes of 6.7 percent and 6.6 percent. Three separate comparisons appear in one release, each measuring something slightly different: sequential quarter change versus year-over-year change, and e-commerce alone versus total retail. A merchant who only checks one of these comparisons risks drawing a conclusion the full release does not support, since the sequential and annual figures move at different rates.