Google review calculator
Estimate how many five-star reviews you need to reach your target rating. Nothing is submitted or stored.
See an example
Worked example
Today
4.3
60 reviews
Target
4.5
reachable
Five-star reviews needed
24
Exact average-rating math, rounded up to a whole review. An estimate, not a promise.
The formula behind the estimate
The calculation asks how many new five-star reviews, n, make the new average reach your target.
The calculator solves that inequality and rounds up, because a fraction of a review cannot arrive. It does not model future one- through four-star ratings, removed reviews, or Google's hidden precision. It also does not predict how many requests you must send: that requires your own measured response rate or an explicitly hypothetical assumption. Ask all eligible customers for an honest review, never just customers expected to give five stars. For a current snapshot pulled directly from your public listing, use the free Google review scanner.
Turn the target into a repeatable ask
ReviewNudger can send a neutral text or email review request after a customer pays, then follow up on the ordered schedule you set. Every customer gets the same fair path.
See how automated review requests work or use the free link and QR generator when you want to start asking manually.
Frequently asked questions
How does the Google review calculator work?
It solves the review-average equation for the smallest whole number of additional five-star reviews needed to reach the selected target. It assumes every new review is five stars and that no other ratings arrive during the projection.
Why is 5.0 not available as a target?
If a rating is already below 5.0, adding five-star reviews can move the average closer and closer to 5.0 but cannot make the exact mathematical average equal 5.0. The calculator stops at 4.9 rather than presenting an unreachable promise.
Why might Google show the target before or after this estimate?
Google displays a rating rounded to one decimal place, while the calculation works from the rating you enter as though it were the exact average. Hidden precision and rounding can make the public display change a little earlier or later.
Does ReviewNudger guarantee I will reach the target?
No. The result is arithmetic, not a forecast. Customers choose whether to review and what rating to leave, and Google controls how ratings and reviews appear. ReviewNudger helps make the neutral ask consistent.
Make review requests part of your routine.
Set up in about 10 minutes. Requests go out after each paid job, follow-ups run on their own, and every review lands in one inbox.
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