Google's Merchant Center help now sets out what a store needs for a store rating: generally at least 100 eligible, unique reviews, collected in a rolling 24-month window and calculated per country — plus a 3.5-star floor for ratings in ads.
Key Takeaways
- Google's Merchant Center help now sets out the requirements for a store rating — the star score for a store as a whole, separate from product ratings.
- A store generally needs at least 100 eligible, unique reviews before Google can calculate a reliable rating.
- Only reviews from a rolling 24-month window count, and ratings are calculated separately for each country.
- For star ratings to show in paid text and Shopping ads, the store must average at least 3.5 out of 5.
What Happened
Search Engine Roundtable reported on 22 September 2026 that Google's store ratings help page now lists its requirements in one place. Reading the page itself, the key lines are:
- "A merchant generally needs to collect at least 100 eligible, unique reviews to enable Google to calculate a reliable store rating."
- "Google evaluates reviews gathered within a rolling 24-month window to ensure the displayed rating reflects your current service quality."
- "Store ratings are geo-segmented and calculated separately for each country rather than aggregated globally."
- "For paid text and Shopping ads, your store must maintain an average composite score of at least 3.5 out of 5 stars."
Google lists where the ratings come from: Google Customer Reviews, Shopping reviews for your store domain, aggregated performance metrics from Google-led shopping research, and supported third-party review partners such as Trustpilot and Yotpo.
Industry Impact & Ranking Volatility
The numbers make store ratings a planning problem rather than a lucky break. A store that collected a burst of reviews two years ago and stopped asking will see them age out of the 24-month window. A store selling in several countries needs enough reviews in each one, because a strong rating in the US does not carry over to Canada or the UK.
For smaller stores, 100 eligible reviews is a real threshold. The practical route is a post-purchase review request through Google Customer Reviews or one of the supported partners, sent to every buyer, so the count builds steadily instead of in campaigns.
The 3.5-star floor applies to paid ads, but the rating itself is a trust signal wherever shoppers see it. It sits alongside the work that gets products found in the first place — indexing, product content and structured data, which our ecommerce SEO work and the WooCommerce SEO checklist cover.
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SearchPrex Action Checklist
- Count your eligible reviews from the last 24 months, per country you sell in — not your all-time total.
- Make sure reviews reach Google. Use Google Customer Reviews or a supported partner, so reviews collected on your own site are not invisible to Google.
- Ask every buyer, automatically, after delivery. A steady flow keeps you above the threshold as older reviews age out.
- Watch the 3.5 average if you run Shopping ads, and fix the delivery or service issues behind low scores rather than the scores themselves.
- Keep product ratings separate in your plan. Product ratings and store ratings are different programmes; see the ecommerce SEO news roundup for this year's other shopping changes.
Quick answers
How many reviews does a store need for a Google store rating?
Google says a merchant generally needs at least 100 eligible, unique reviews for it to calculate a reliable store rating.
Do old reviews count towards a Google store rating?
Only reviews from a rolling 24-month window. Older reviews stop counting, so a store has to keep collecting them.
Is the store rating the same in every country?
No. Google calculates store ratings separately for each country, so each market needs its own reviews.
📌 Original Source Reference: Read the requirements in Google Merchant Center Help and the report at Search Engine Roundtable.
Sources
- Google store ratings: An overview for Merchants — Google Merchant Center Help, Requirements section.
- Google Merchant Center Requirements For Google Store Ratings — Search Engine Roundtable, 22 September 2026.
Last verified: 28 September 2026.
About the Author
Mubashar Sharif is a Verified SEO Expert and Senior Analyst at SearchPrex. He tracks daily SERP fluctuations, Google core algorithm shifts, and generative AI search architecture. Connect with Mubashar on LinkedIn.
Mubashar Sharif
LinkedIn ProfileSenior SEO Analyst & Algorithm Strategist at SearchPrex, specializing in Google search volatility, technical architecture, and Generative Engine Optimization (GEO).
