Find out exactly how many 5-star reviews you need to reach your target Google rating, and see what one bad review really costs you.
The star rating shown on your Google Business Profile
The review count shown next to your rating
The rating you want your profile to show
Add this to see how long it will take
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Use Tool →How It Works
Four numbers from your Google Business Profile are all it takes. Nothing is stored and you do not need an account.
Copy the star rating from your Google Business Profile, for example 4.2.
Add the number of reviews shown next to the rating. It sets how hard your average is to move.
Choose the rating you want to show, such as 4.5 or 4.8. Add reviews per month to get a timeline.
See the 5-star reviews you need, a safe number that allows for rounding, and every step along the way.
The Formula
Your Google rating is the average of all your star ratings. Solve that average for your target and you get one short formula.
5-star reviews needed
Reviews needed = N x (Target - Current) / (5 - Target)
Example: 85 reviews at 4.2, aiming for 4.5: 85 x 0.3 / 0.5 = 51 five-star reviews
N is your current number of reviews. Round the answer up, because half a review does not count. The formula assumes every new review is 5 stars, so treat the result as the minimum.
Why 5.0 is out of reach. The bottom of the formula is 5 minus your target. At a target of 5.0 that becomes zero, which means no number of 5-star reviews is enough. Once any review below 5 stars is on your profile, a perfect 5.0 is gone for good.
Why there is a safe number. Google shows your rating rounded to one decimal, so a profile that shows 4.2 could really average anywhere from about 4.15 to 4.25. The calculator works out a second, safe count from the low end so you do not fall just short.
Worked Examples
The same jump costs very different amounts depending on how many reviews you already have and how close to 5.0 you are aiming.
| Starting point | Target | 5-star reviews needed |
|---|---|---|
| 3.8 from 40 reviews | 4.2 | 20 |
| 4.0 from 25 reviews | 4.5 | 25 |
| 4.2 from 85 reviews | 4.5 | 51 |
| 4.3 from 150 reviews | 4.6 | 113 |
| 4.5 from 60 reviews | 4.8 | 90 |
| 4.6 from 300 reviews | 4.8 | 300 |
Calculated with the formula above, assuming every new review is 5 stars. Your own numbers will differ.
The Cost of One Bad Review
The higher your rating, the more a single 1-star review costs. This does not depend on how many reviews you have: it is the number of 5-star reviews that puts your average back where it was.
| Your rating | 5-star reviews to undo one 1-star |
|---|---|
| 4.0 | 3 |
| 4.3 | 5 |
| 4.5 | 7 |
| 4.7 | 13 |
| 4.8 | 19 |
| 4.9 | 39 |
Worked out as (rating - 1) / (5 - rating), rounded up. Use the "What if" tab above to test any mix of new reviews against your own profile.
Rating vs Review Count
A bigger count protects you. With 10 reviews, one bad review can drag a 4.8 down to about 4.45. With 300 reviews, the same review barely shows. Every new review makes your rating steadier.
A bigger count also makes climbing slower. The N in the formula works both ways. A profile with hundreds of reviews needs far more new 5-star reviews to move up by 0.1 than a new profile does.
So aim for a steady flow, not a burst. A regular stream of fresh reviews keeps your profile current, protects the rating you have, and slowly lifts it. Add your monthly pace in the calculator to see a realistic timeline.
What Not to Do
When the number looks big, shortcuts are tempting. These four can get reviews removed or worse. See Google’s policy on fake engagement and the FTC’s 2024 rule on fake reviews.
Discounts, freebies, or prize draws in exchange for a review break Google’s policy, even when the review is honest.
Against Google policyScreening customers first and sending only the satisfied ones to Google is called review gating. Google prohibits it.
Against Google policyFake reviews can be removed by Google, and in the US the FTC’s 2024 rule lets it seek civil penalties for them.
Legal risk in the USReviews written by owners, employees, or relatives are a conflict of interest under Google’s rules and can be taken down.
Against Google policyGet More Reviews
Most happy customers never leave a review because nobody asked. These four habits close that gap the honest way.
Ask right after a good experience: a finished job, a delivered order, a thank-you at the counter. Asking everyone keeps you inside Google’s rules and gives you a steady flow.
Write a review request →Send a direct link to your review form instead of asking people to search for you. Every extra step loses people. Put the link in receipts, emails, and a QR code at the till.
Make a QR code →Thank the good ones and answer the bad ones calmly and publicly. It shows future customers you listen, and a fixed problem is a reason for an unhappy customer to update their review.
Score your reputation →Reviews on Google help people find you. The same reviews on your own pricing, booking, and product pages help them say yes. Put them where the decision happens.
Add Google reviews to your site →From the Blog
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