Google Review Rating Calculator

See how many 5-star reviews stand between you and the rating you want.

Copy the two numbers straight off your Google Business Profile — the star average and the review count next to it.

77
more 5-star reviews to reach 4.5
4.2 from 128 reviews → 4.50 from 205
What the nearer targets cost

Each row assumes every new review is 5 stars. Chasing the last tenth is always the expensive part.

Target rating5-star reviews neededTotal reviews after
4.319147
4.443171
4.577205
4.6128256
4.7214342
4.8384512
4.98971,025
This works out the arithmetic, not the strategy. Asking happy customers to review you is allowed everywhere; buying reviews or filtering out unhappy ones breaks Google's policies and gets ratings wiped.

About the Review Rating Calculator

A star rating is an average, which means it gets harder to move the more reviews you have. Twenty reviews at 4.2 will climb quickly; two thousand at 4.2 barely budge. That is why 'we just need a few more good reviews' is usually wrong by an order of magnitude, and why plenty of businesses spend a quarter chasing a number they were never going to hit. Put your real figures in above and you get the actual count — plus a ladder showing what 4.3, 4.4 and 4.5 cost, so you can pick a target you can afford instead of one that sounds nice.

How to use it

  1. 1Open your Google Business Profile and read off two numbers: the star average and how many reviews it is based on.
  2. 2Type both in, then set the rating you are aiming for.
  3. 3Read the big number — that is how many 5-star reviews it takes. Check the ladder below it to see whether a nearer target is a far better deal.

Why use it

The real number, not a guess
Solved directly from the averaging maths, so the answer is exact rather than a rule of thumb someone repeated on a marketing blog.
Shows you the cheaper win
The ladder prices every target from your next tenth up to 4.9. Seeing 4.5 at 30 reviews next to 4.7 at 140 changes what you go after.
Honest about 5.0
Once a single review is under 5 stars, a perfect 5.0 average is mathematically out of reach. Most calculators loop forever or quietly lie. This one says so.
No account, no limit
The arithmetic runs in your browser. Use it as many times as you like, for as many locations as you have.

FAQ

How is the number worked out?

Your rating times your review count gives your total star points. Adding N five-star reviews makes the new average (total + 5N) divided by (count + N). Set that equal to your target and solve for N, then round up to a whole review. That is the number shown.

Why can I not reach a 5.0 rating?

Because an average can only equal 5.0 if every single review is 5 stars. One 4-star review permanently pulls the total below the maximum, and adding perfect reviews after it makes the average approach 5.0 without ever arriving. Google also rounds what it displays, so a 4.95 average shows as 5.0 in some places — that is display rounding, not a true 5.0.

Does it assume every new review is 5 stars?

Yes, and that is the best case. In reality some new reviews will be 4 stars or lower, so treat the number as a floor. If your incoming reviews average around 4.6, expect to need roughly twice the figure shown.

Can I use this for Amazon, Trustpilot, Yelp or an app store?

Yes. The maths is the same for any 5-star average. Just enter that platform's rating and review count instead of Google's. Ratings that are weighted by recency or verified purchase — some Amazon and Trustpilot scores are — will drift from this estimate.

How do I actually get more reviews?

Ask, at the moment someone is happy, with a direct link that lands them on the review form. Google gives every profile a short review link you can text or print on a receipt. What you cannot do is buy reviews, offer a discount in exchange for one, or only ask the customers you expect to be positive — all three break Google's policies and can wipe your rating entirely.

Do bad reviews ever fall off?

Not with age. Reviews stay until the author deletes them or the platform removes one for breaking its rules. You can reply publicly, and you can report a review that is fake or abusive, but you cannot expect an old 1-star to expire.