Written by the Removal Lab team.
Sitting on 4.2 stars and wondering how many happy customers it takes to show 4.5? This free Google review calculator from Removal Lab tells you how many new 5 star reviews you need to reach a target rating. It also shows how far your average would move if a rule breaking 1 star review came down.
Type your numbers into the Google review calculator below. If the results show that one or two unfair reviews are doing most of the damage, Removal Lab offers a free, confidential check. A specialist reads each review against Google’s rules and replies within one business day. On qualifying cases there is no upfront payment.
Google rating calculator
Google shows a rounded average, so the real figure can differ slightly. This is an estimate, not a promise of any removal.
How to use the Google review calculator
The Google review calculator above, which some people call a Google rating calculator or a review rating calculator, needs four numbers. You will find all of them on your Business Profile or in your own records.
- Your current rating. The star figure Google shows on your profile, such as 4.2.
- Number of reviews. The total count Google shows next to your stars.
- Rating you want. Your target, up to 4.9. A perfect 5.0 only happens when every single review is 5 stars, so the tool stops just short of it.
- 1 star reviews that break the rules. How many of your 1 star reviews you believe are fake, off topic or otherwise against Google policy. Put 0 if you are not sure.
It then gives you three answers. First, how many new 5 star reviews would lift your average to the target. Second, where your average would land if those rule breaking 1 star reviews were removed. Third, how far one more 1 star review would pull you down. The numbers update as you type.
Treat every answer as an estimate. The rating you enter is the figure you see on your profile. The true average behind it can sit a little above or below it. The Google review calculator works to the exact target you type. It does not try to copy Google’s rounding, because Google does not publish its rounding rule.
How Google calculates your star rating
Google explains this on its Business Profile help page about review scores. Scores run from 1 to 5 stars, with 5 the highest. Google says the review score is the average of all ratings published on Google for that place or business.
Three details matter when you plan your numbers.
- It is a plain average. Google’s page describes a simple average and mentions no weighting by date, reviewer or length of review. That plain average is what the Google review calculator models.
- Only published ratings count. The average is built from ratings published on Google. A review Google takes down is no longer published, so it no longer counts.
- Updates are not instant. Google says that after someone leaves a new review, it may take up to two weeks for the review score to update.
Some service businesses also see ratings for single aspects such as price. Google’s page on reviews for service businesses says those combined ratings are worked out by dividing the number of positive ratings by the total number of ratings. They are a share, not a star average, so this Google review calculator does not cover them.
Some profiles also show reviews that Google gathers from other review sites. Google says concerns about those reviews should go to the site they came from.
| Question | What Google says |
|---|---|
| How is the score worked out? | The average of all ratings published on Google for that place or business |
| What scale is used? | 1 to 5 stars, with 5 the highest |
| How fast does it update? | It may take up to two weeks after a new review |
| How is the average rounded? | Google does not publish a rounding rule |
| Is there a minimum number of reviews? | The review scores page does not say |
| Are some reviews weighted more? | The page describes a plain average and mentions no weighting |
Google does not publish its rounding rule
We read Google’s help pages on review scores. They explain the average and the update delay. They say nothing about how the figure is rounded for display. A website that states Google’s exact rounding rule is guessing. Removal Lab’s Google review calculator shows the averages to two decimal places so you can see how close you really are.
The maths behind the Google review calculator
Your average is your total stars divided by your number of reviews. A business at 4.2 stars from 50 reviews holds 210 stars in total, because 4.2 times 50 is 210.
Each new 5 star review adds 5 stars and 1 review. So the question is simple: how many times can you add 5 stars and 1 review before total stars divided by total reviews reaches your target?
In plain words: multiply your target by your current number of reviews. Take away your current total stars. Divide what is left by the gap between 5 and your target. Round up to the next whole review. That is exactly what the Google review calculator does for you.
That last division is why high targets get hard fast. At a 4.5 target the gap to 5 is only 0.5, so each new review lifts you very little. At 4.9 the gap is 0.1, so each review lifts you even less.
This is a made up example to show the steps. It is not a client case.
Picture a clinic at 4.2 stars from 50 reviews. Here is what the Google review calculator returns for each target, if nothing else arrived in between.
| Target rating | New 5 star reviews needed | Total reviews afterwards |
|---|---|---|
| 4.3 | 8 | 58 |
| 4.4 | 17 | 67 |
| 4.5 | 30 | 80 |
| 4.6 | 50 | 100 |
| 4.7 | 84 | 134 |
| 4.8 | 150 | 200 |
| 4.9 | 350 | 400 |
Real life is messier. Any new review below your target pushes the finish line further away, so the true number is often higher than the table shows.
Why removing a rule breaking review moves the average more than you expect
Here is the part most owners miss. A new 5 star review can only lift your average by the gap between 5 and where you are now. At 4.2 that gap is 0.8. A 1 star review drags you down by the gap between your average and 1. At 4.2 that drag is 3.2, which is four times bigger.
So when a 1 star review that breaks Google’s rules comes down, your average loses its heaviest weight in one go.
This is a made up example to show the steps. It is not a client case.
Take the same clinic at 4.2 stars from 50 reviews. Removing one rule breaking 1 star review takes it to about 4.27. Removing two takes it to about 4.33. Removing three takes it to about 4.40. To pass 4.4 with new reviews alone, it would need 17 more 5 star reviews.
The table below uses the same sums as the Google review calculator to show this effect at different ratings, each with 50 reviews.
| Current rating (50 reviews) | Average after one rule breaking 1 star review is removed | New 5 star reviews needed for the same lift |
|---|---|---|
| 3.8 | About 3.86 | 3 |
| 4.0 | About 4.06 | 4 |
| 4.2 | About 4.27 | 5 |
| 4.4 | About 4.47 | 7 |
| 4.6 | About 4.67 | 12 |
The higher your rating, the more one unfair 1 star review costs you. That is why a single fake review stings a 4.6 business so badly. It is also why the second answer in the Google review calculator is worth a look before you start chasing dozens of new reviews.
There is one big condition. Google’s help page on reporting inappropriate reviews says only reviews that violate Google policies are eligible for removal. It asks businesses not to report a review just because they disagree with it or dislike it. It also says Google does not get involved in conflicts between businesses and customers. A harsh but genuine review stays up.
Our guide to Google review policy violations lists the grounds Google uses. If you want to try it yourself first, our guide on how to remove a Google review walks through the report and appeal steps. If a wave of 1 star reviews arrived at once from people you never served, read our page on review bombing removal. If you believe the reviews were invented, fake review removal explains the evidence that helps.
What never to do to raise a Google rating
When the maths looks grim, shortcuts get tempting. Every one below can cost you far more than a few stars.
- Buying reviews or writing your own. Google’s contribution policy bans reviews or ratings that have been paid for, directly or in kind. It also bans content posted from several accounts by or for one person. In the US, 16 CFR 465.2 bans writing, creating or selling fake reviews. It also bans buying them when a business knew or should have known they were fake.
- Paying for good reviews, or for deleting bad ones. Google’s tips to get more reviews say offering free or discounted goods or services in exchange for posting, changing or removing reviews is strictly prohibited. 16 CFR 465.4 bans incentives conditioned on a review expressing a particular sentiment, positive or negative.
- Review gating. This means asking only happy customers for reviews, or steering unhappy ones away. Google’s policy names it directly: businesses must not discourage or prohibit negative reviews, or selectively solicit positive reviews from customers.
- Staff review quotas. Google lists merchants requesting that staff solicit a certain number of reviews as rating manipulation. It also counts current or former employment as a conflict of interest.
- Threatening reviewers. 16 CFR 465.7 bans unfounded legal threats, physical threats, intimidation and certain false public accusations used to get a review removed.
- Paying someone who demands money. If a stranger offers to stop or remove 1 star reviews for a fee, Google’s extortion guidance says not to engage with or pay them and to use its merchant extortion report form.
The penalties are real. Google says that, as well as removing violating reviews, it may restrict a Business Profile. A restricted profile may be unable to receive new reviews for a set period, may have its existing reviews unpublished for a set period and may show a warning that fake reviews were removed. The FTC says its rule on fake reviews lets it seek civil penalties against knowing violators.
Honest ways to get more genuine Google reviews
Google’s own advice is short. Ask customers to leave a review through a Google link or by scanning a QR code. Customers need a Google Account to post one.
How to get your review link or QR code
These are the steps from Google’s help page on how to create a link or QR code to request reviews.
- Go to your Business Profile at business.google.com.
- Select Read Reviews, then select Get more reviews.
- To copy the review link, select Copy. To save the QR code, right click it and select Save image as.
Google notes that the QR code can only be made in a computer browser, not on a phone.
Where to share it
Google suggests receipts, thank you emails, the end of a chat and a printed QR code in your shop. You can also send the request by email, WhatsApp or a Facebook post.
Habits that keep it honest
- Ask every customer the same way, whether the visit went well or not. Google’s tips page notes that a mix of positive and negative feedback often feels more trustworthy.
- Never attach a discount, gift or prize draw to the request.
- Reply to reviews in a short, professional way. Google advises against using replies to offer deals or promotions and says never to share a reviewer’s private information. Our guide on how to respond to a negative Google review has examples.
- Remember that other platforms have their own rules. Yelp, for example, tells businesses not to ask anyone for reviews at all.
A steady flow of genuine reviews will move your Google review calculator answer more reliably than any shortcut. None of them put your profile at risk.
When to ask Removal Lab for a free check
Run the Google review calculator with an honest count of rule breaking 1 star reviews. If the second answer in the Google review calculator shows a big jump, a second opinion is worth having. Ask Removal Lab for a free check when:
- The reviewer never bought from you, visited or contacted you. Your records back that up.
- A run of 1 star reviews arrived within a few days, often with no text or with copied wording.
- The review looks like it came from a competitor, a former employee or someone else with a conflict of interest.
- The review contains hate speech, threats, someone’s personal information or content that has nothing to do with your business.
- Someone demands money or favours to remove reviews or to stop posting them.
A specialist reads each review against Google’s policies and tells you honestly which ones qualify and which ones do not. Removal Lab does not work for Google, cannot delete anything itself and never promises a removal. Google makes every decision. On qualifying cases there is no upfront payment. You pay only when the review is removed.
See Google review removal for how the service works, or request a confidential case review now.
How Removal Lab works
- Send the link. WhatsApp, email or the two field form. Two minutes, no long questionnaire.
- Free policy check. A specialist reads it against the platform rules and tells you honestly whether it qualifies.
- We build and file the case. The right policy, the right channel, the evidence attached. We handle the appeal too.
- Pay only when it is gone. No upfront payment on qualifying cases. If the platform says no, you owe nothing.
What we will never do
- Promise a removal. The platform decides, not us.
- Post fake reviews or pay anyone to delete a review.
- Pressure, threaten or try to identify a reviewer.
- Charge an upfront fee on a case that does not qualify.
Ran the Google review calculator? Now check the reviews.
Send the links. A specialist checks each one against Google policy and replies within one business day. No upfront payment on qualifying cases.
Frequently asked questions
How many 5 star reviews do I need to raise my Google rating?
It depends on your current rating, your review count and your target. A business at 4.2 stars from 50 reviews needs 30 new 5 star reviews to reach 4.5 and 150 to reach 4.8. The free Removal Lab Google review calculator works out your own figure in seconds.
How does Google calculate my star rating?
Google says the review score is the average of all ratings published on Google for that business, on a scale of 1 to 5 stars. It also says the score may take up to two weeks to update after a new review. The Google review calculator on this page uses that plain average.
Does Google round my rating up or down?
Google does not publish its rounding rule. Its help page explains the average but not how the figure is rounded for display, so treat any Google review calculator result as a close estimate.
How many 5 star reviews cancel out one 1 star review?
At a 4.2 average with 50 reviews, it takes four new 5 star reviews to win back the ground lost to one new 1 star review. The higher your rating, the more 5 star reviews each 1 star review costs you.
Will my Google rating go up if a 1 star review is removed?
Google bases the score on ratings published on Google, so a removed review drops out of the average and the Google review calculator shows how far it would move. Only reviews that break Google policy can be removed and Google makes that decision.
Is it legal to buy Google reviews?
Google bans paid reviews and in the US the FTC rule at 16 CFR Part 465 bans buying fake reviews and paying for reviews that express a particular sentiment. Google can also remove the reviews and restrict your Business Profile.
Is the Google review calculator free?
Yes. The Removal Lab Google review calculator is free, needs no sign up and only asks for four numbers. Our policy check on any individual review is free too.
Sources: Google: Understand review scores, Google: About reviews for service businesses, Google: Report inappropriate reviews, Google: Tips to get more reviews, Google: Create a link or QR code to request reviews, Google: Business Profile restrictions, Google Maps user contributed content policy, Google: Report negative review extortion scams, 16 CFR 465.2, 16 CFR 465.4, 16 CFR 465.7, FTC final rule on fake reviews and Yelp: Don’t ask for reviews. Removal Lab does not work for Google. Every decision is made by the platform.