Google Rating Calculator
Enter your current Google rating, review count, and target rating to see how many new 5-star reviews it takes to get there.
New Google reviews needed to go from 3.8★ to 4.5★
Google uses a simple average, so this estimate is exact. See how Google's rating actually works or Google review management.
What actually moves a Google rating
Google’s own help documentation is direct about this: “the review score is the average of all ratings published on Google for that place or business.” That’s a plain arithmetic mean — add up every star rating and divide by the count — with no Bayesian adjustment or new-business dilution like some platforms use.
The visible number lags reality on two fronts. First, individual reviews are checked against Google’s content policies before they appear, which “might take a few days.” Second, even once a review is live, Google’s own guidance says “it may take up to 2 weeks to get an updated review score” after that. A business can post a genuine new review and not see its average move for days or weeks — that’s normal, not a sign something is broken.
- Simple average — the displayed score is the sum of all published star ratings divided by the number of ratings, with no weighting scheme Google discloses.
- Processing delay — a new review can take a few days to appear at all while Google checks it against policy.
- Update lag — once live, a review can take up to two weeks to be reflected in the visible score.
- Policy compliance filter — fake, incentivized, off-topic, or otherwise prohibited reviews don’t count toward the average, whether they were ever published or later removed.
Frequently asked questions
How accurate is this calculator for Google?
Google's rating is a simple average, so for a given current rating, review count and target, the number this calculator gives you is exact — not an estimate.
Does review volume alone move my Google rating?
Simple average — the displayed score is the sum of all published star ratings divided by the number of ratings, with no weighting scheme Google discloses.
Where can I see more on how Google's rating works?
See our full breakdown of Google's rating mechanics, or go straight to Google review management if you'd rather have this handled for you.