Google Updated Merchant Center Star Rating Rules
E-commerce operators must maintain 100 reviews and a 3.5-star average to qualify for rating displays in ads.
Updated on Sept. 28, 2026 in Retail
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Google has updated its Merchant Center documentation regarding eligibility criteria for seller star ratings in advertisements. Retailers now must track specific volume and scoring thresholds for their store feedback to qualify for these displays.
Why it matters
Seller ratings serve as key social proof in digital advertising, and missing these thresholds can reduce click-through rates on search ads. Operators need to ensure their feedback solicitation systems remain active to sustain the required volume of recent reviews.
Google mandates a minimum of 100 eligible reviews and a 3.5-star average for ads, with data windowing limited to a 24-month rolling period. Ratings are calculated on a per-country basis, requiring businesses to manage separate review thresholds for each market they serve.
The players
A dominant search and advertising technology company that provides the platform infrastructure for digital retail customer feedback.
The details
To collect feedback, merchants utilize the Google Customer Reviews mechanism by integrating a survey invitation into the post-purchase checkout flow. Customers who opt into this service receive an email request to rate their shopping experience, which Google then aggregates. Reviews remain eligible for calculation within a 24-month window, after which they are excluded, necessitating a continuous stream of new customer feedback to maintain eligibility.
Timeline
Review data is included in rating calculations for a rolling 24-month window.
Market Landscape
These requirements follow established industry trends where major platforms standardize social proof to protect ad quality. The documentation update clarifies how Google maintains the integrity of seller ratings across competitive search environments.
Retailers should audit their post-purchase email sequences to ensure the survey invitation is triggering correctly. Managers should monitor their review volume to ensure it does not dip below 100, which would result in the loss of star ratings in paid search results.
The takeaway
Maintaining visibility in digital ads requires proactive management of customer feedback loops to stay above the 100-review threshold. Operators should verify their current status in the Merchant Center dashboard and ensure their review solicitation rate is sufficient to offset the 24-month data decay.
Further reading
For more on optimizing digital sales channels, see our Retail section.
Source note: This article includes information reported by Search Engine Watch.
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Do you trust online star ratings to accurately represent the quality of a business?
