--- title: "How Many 5-Star Reviews Do You Need to Raise Your Rating?" description: "One formula shows how many 5-star reviews it takes to reach a target rating. Worked examples, the cost of one bad review and honest ways to improve." url: https://brandprotecto.com/blog/how-many-reviews-to-raise-rating updated: 2026-10-28 publisher: BRANDprotecto (info@brandprotecto.com) --- # How Many 5-Star Reviews Do You Need to Raise Your Rating? [Home](https://brandprotecto.com) / [Blog](https://brandprotecto.com/blog) / Reviews & profile growth Reviews & profile growth # How Many 5-Star Reviews Do You Need to Raise Your Rating? The arithmetic behind your star rating: a simple formula, worked examples, what one negative review costs, and why the only reliable lever is better experiences. By the BRANDprotecto editorial team · Published October 28, 2026 · Last reviewed October 28, 2026 · 6 min read ## In short - The number of 5-star reviews needed is N × (T − R) ÷ (5 − T), rounded up, where N is your review count, R your average and T your target. - Each step closer to 5.0 costs more reviews than the last, and the number grows in proportion to your existing review count. - If your new reviews average at or below your target, the overall rating cannot reach it, however many reviews you collect. - Google describes its review score as the average of all ratings published on Google, but other platforms may calculate ratings differently. - The honest path is fixing recurring problems and asking every customer consistently, never incentives, gating or reporting reviews you dislike. To find how many 5-star reviews you need, use n = N × (T − R) ÷ (5 − T), where N is your current number of reviews, R your current average and T your target, then round up. For example, 100 reviews averaging 4.2 need 100 × 0.3 ÷ 0.5 = 60 five-star reviews with no lower ratings in between to reach 4.5; any lower rating raises the number. ## The formula, step by step An average rating is the total number of stars divided by the number of reviews. Google's page on [review scores](https://support.google.com/business/answer/4801187?hl=en) says the score is the average of all ratings published on Google for that place or business, on a scale of 1 to 5 stars. That makes the arithmetic straightforward. - Your current total of stars is N × R. - After n new five-star reviews, the total becomes N × R + 5n, spread over N + n reviews. - Set that new average equal to your target T and solve for n: n = N × (T − R) ÷ (5 − T). - Round up to the next whole review, because there is no such thing as part of a review. Two things follow directly from the formula. The number grows in proportion to your existing review count, so a profile with five times as many reviews needs five times as many new ones for the same step. And the closer the target gets to 5, the smaller the denominator, so each extra tenth of a star costs more than the one before. ## Worked examples The table below is arithmetic, not data about any real business. It assumes every new review is five stars. Current reviews (N) Current average (R) Target (T) Five-star reviews needed 20 4.0 4.5 20 50 3.6 4.0 20 100 4.2 4.5 60 100 4.2 4.8 300 250 4.6 4.7 84 500 4.2 4.5 300 Compare the two rows for 100 reviews at 4.2. Reaching 4.5 takes 60 five-star reviews; reaching 4.8 takes 300, five times as many for twice the improvement. The row with 250 reviews shows why you round up: the formula gives 83.3, so you need 84. Platforms display a rounded figure, and Google's help page does not document its rounding rule. If you care about a particular displayed number, run the calculation for that exact value, such as 4.50, rather than for a value just below it that might or might not round up. Google also says that after someone leaves a new review, it may take up to 2 weeks to get an updated review score, so the displayed number can lag behind your own calculation. ## When new reviews are not all five stars Real customers leave a mix of ratings. Replace the 5 in the formula with m, the average rating of your new reviews: n = N × (T − R) ÷ (m − T). **Worked example (illustrative arithmetic):** you have 100 reviews averaging 4.2 and want 4.5. If new reviews average 4.7 rather than 5.0, you need 100 × 0.3 ÷ 0.2 = 150 of them instead of 60. The formula also shows a hard limit: over time, the overall average drifts towards the average of your new reviews. If new reviews average more than your current rating but less than your target, the overall rating rises, then levels off near that lower figure and never reaches the target, however many reviews you collect. If they average exactly the target, it creeps towards the target without quite getting there, and if they average less than your current rating, it falls. The average of your recent reviews is therefore the number to watch, because it tells you where the overall rating is heading. ## Turn the number into a timeline The count of reviews only becomes useful once you set it against how many reviews you actually receive. Divide the number you need by your typical monthly volume of new reviews. **Worked example (illustrative arithmetic):** a location with 100 reviews needs 150 new reviews averaging 4.7 to move from 4.2 to 4.5, and currently receives about 15 reviews a month. At that pace the move takes around 10 months. If a more consistent request doubled the monthly volume while the average of new reviews stayed at 4.7, the same move would take around 5 months. Run the same calculation for each location and you get a realistic plan instead of a target picked because it looks good on a slide. It also shows which lever matters more at a given location: volume, if the recent average is already above the target, or the experience itself, if the recent average is below it. ## What one negative review costs If you sit exactly at your target T, one new review with r stars creates a shortfall of T − r stars, and each five-star review makes up 5 − T. So the number of five-star reviews needed to get back to the target is (T − r) ÷ (5 − T), whatever the size of your existing review count. Target One 1-star review is offset by One 2-star review is offset by 4.0 3 five-star reviews 2 five-star reviews 4.5 7 five-star reviews 5 five-star reviews 4.8 19 five-star reviews 14 five-star reviews What does depend on size is how far the average drops. **Worked example (illustrative arithmetic):** a profile with 20 reviews at exactly 4.5 falls to about 4.33 after one 1-star review, while a profile with 200 reviews at 4.5 falls to about 4.48. Both need seven five-star reviews to get back to 4.5. A larger review base does not make negative reviews free; it makes each one less visible in the average. ## The same math on other platforms The formula assumes a simple average of every rating. That matches Google's description, but not every platform works this way. Yelp, for example, says [only the star ratings of recommended reviews](https://www.yelp-support.com/article/Do-reviews-that-arent-currently-recommended-impact-the-businesss-star-rating?l=en_US) are used to calculate a business's overall rating. On Yelp the formula therefore applies only to the reviews currently recommended, and you cannot predict which new reviews those will be. Before you run numbers for any other platform, read how its help center says the rating is calculated. ## Why the average is not the whole story A reader sees more than the number. They see how many reviews you have, how recent they are, what the latest reviewers wrote and whether you replied. Google's own [tips to get more reviews](https://support.google.com/business/answer/3474122?hl=en) note that a mix of positive and negative feedback often feels more trustworthy. A slightly lower rating backed by steady recent reviews and thoughtful replies can tell a better story than a high rating with nothing new for months. That is also why the rating should not be the goal on its own. The average follows the experience you deliver. If your recent reviews keep mentioning the same problem, fixing it does more for the rating than any campaign. Our guide to [analyzing customer reviews](https://brandprotecto.com/blog/how-to-analyze-customer-reviews) shows how to find those recurring themes. ## The honest way to raise your rating - **Fix what the low reviews describe.** Every new review above your current average pulls the overall rating up. - **Ask every customer in the same way.** Google suggests asking customers to visit a Google link or scan a QR code to leave a review. A consistent request raises volume without skewing who is asked. - **Reply to reviews.** Google's tips describe replying as a way to show customers that their feedback matters. - **Stay within the rules.** Google's [prohibited and restricted content policy](https://support.google.com/contributionpolicy/answer/7400114?hl=en) bans incentives for reviews and selectively soliciting positive ones, and our guide on [getting more Google reviews](https://brandprotecto.com/blog/how-to-get-more-google-reviews) covers what to do instead. - **Report only genuine violations.** Google's page on [reporting inappropriate reviews](https://support.google.com/business/answer/4596773?hl=en) says not to report a review just because you disagree with it or dislike it. Honest negative reviews are not yours to take down; the platform decides on content that breaks its rules, as our guide on [when a Google review can be removed](https://brandprotecto.com/blog/how-to-get-a-google-review-removed) explains. ## Frequently asked questions ### How do I calculate how many 5-star reviews I need? Multiply your current number of reviews by the gap between your target and your current average, then divide by the gap between 5 and your target, and round up. As an arithmetic example, 40 reviews at 4.1 aiming for 4.4 gives 40 × 0.3 ÷ 0.6 = 20 five-star reviews, assuming no lower ratings arrive in between. ### Why did one bad review drop my rating so much? With few reviews, each one carries a lot of weight. As an arithmetic example, 10 reviews at exactly 4.0 fall to about 3.73 after one 1-star review, while 100 reviews at 4.0 fall only to about 3.97. In both cases three five-star reviews bring the average back to 4.0, because the offset depends on the target, not on the review count. ### Is it possible to reach a 5.0 rating? Only if every rating is five stars. Once a single lower rating exists, the true average can no longer reach 5.0, however many five-star reviews follow; it only gets closer. Whether a displayed figure would ever round up to 5.0 is not documented by Google. A perfect score is also not necessary: Google's tips note that a mix of positive and negative feedback often feels more trustworthy. ### How long does Google take to update my rating after a new review? Google's help page on review scores says that after someone leaves a new review, it may take up to 2 weeks to get an updated review score. If your own calculation and the displayed figure differ, wait for the update before drawing conclusions, and keep in mind that the page does not document how the displayed number is rounded. ## Sources - [Understand review scores for local places & businesses — Google Business Profile Help](https://support.google.com/business/answer/4801187?hl=en) (checked October 28, 2026) - [Do reviews that aren't currently recommended impact the business's star rating? — Yelp Support Center](https://www.yelp-support.com/article/Do-reviews-that-arent-currently-recommended-impact-the-businesss-star-rating?l=en_US) (checked October 28, 2026) - [Tips to get more reviews — Google Business Profile Help](https://support.google.com/business/answer/3474122?hl=en) (checked October 28, 2026) - [Prohibited & restricted content — Maps User Generated Content Policy Help (Google)](https://support.google.com/contributionpolicy/answer/7400114?hl=en) (checked October 28, 2026) - [Report inappropriate reviews on your Business Profile — Google Business Profile Help](https://support.google.com/business/answer/4596773?hl=en) (checked October 28, 2026) Prepared by the BRANDprotecto editorial team with AI assistance and checked against the sources above. Platform rules and laws change: always confirm the current wording at the source. This article is general information, not legal advice. ## See how your business looks online Request a free reputation audit. We look at your Google Business Profile and your Google reviews and email you the summary with your Brand Health Score and the main problem areas within one business day. [Start free audit](https://brandprotecto.com/audit/start) ## Related articles [Reviews & profile growth Do Reviews Affect Local SEO? What Google Actually Says (and What Is Guesswork) Google confirms that reviews count toward local prominence, alongside relevance and distance. Here is what that means in practice, and which popular claims are guesswork. October 30, 2026 · 8 min read](https://brandprotecto.com/blog/do-reviews-affect-local-seo) [Reviews & profile growth Google Business Profile Suspended: Causes and How to Appeal A suspended profile disappears from Google Maps and Search. Here is how to find the likely cause, fix it, prepare evidence, and file the one appeal Google allows. October 29, 2026 · 7 min read](https://brandprotecto.com/blog/google-business-profile-suspended) [Reviews & profile growth Why Did My Google Reviews Disappear? What to Check and When to Contact Support Reviews can vanish because of policy checks, a profile merge, a reinstatement, restrictions or simply a delay. Here is how to work out which one applies and what to do next. October 29, 2026 · 7 min read](https://brandprotecto.com/blog/why-google-reviews-disappear)