Google Review Calculator
How many five-star reviews do you need to reach 4.5, or 4.8? Find your business, pick the rating you want, and get the exact number.
Add your city after the name so we find the right place. Not showing up? In Google Maps tap your business, then Share, and paste that link here.
Picking your business fills in your numbers. Or type them yourself:
Your answer
53 five-star reviews in a row to go from 4.2 to 4.5
- At 4 new reviews a month, that takes about 14 months, and longer if any of them are below five stars.
- At 4.2, one 1-star review takes 4 five-star reviews to cancel out.
Google shows your rating with one decimal and calculates it from the exact average, which is not public, so the real answer can be a few reviews either way.
The fastest way to 53 more reviews: ask every customer
Most happy customers never review because nobody asked at the right moment. A QR code on the counter, the table or the receipt asks all of them, takes them straight to your review box, and counts every scan, so you see if the 4.5 is getting closer.
Design it free, no account needed. 14-day free trial to print it, cancel anytime.
Or get the free review link to send by textAsk everyone, not only the customers you expect to be happy, and never offer anything in return for a review. Google removes reviews collected that way.
Scans this week
+24%38
Google rating
4.7
New reviews
+9
Sample dashboard
Your review QR card on the counter, every scan counted.
The formula
How many 5-star reviews you need
Reviews you have × (rating you want − rating you have) ÷ (5 − rating you want), rounded up. The closer the target is to 5, the smaller the bottom of that fraction, and the faster the number grows.
| Rating now | Reviews now | Target | 5-star reviews needed |
|---|---|---|---|
| 3.8 | 30 | 4.0 | 6 |
| 4.0 | 50 | 4.5 | 50 |
| 4.2 | 87 | 4.5 | 53 |
| 4.4 | 200 | 4.6 | 100 |
| 4.6 | 120 | 4.8 | 120 |
The last row is the one that surprises people: going from 4.6 to 4.8 with 120 reviews takes 120 more five-star reviews. Every 0.1 near the top costs more than the one before it.
The cost of one bad review
The better your rating, the more a 1-star review costs
A 1-star review drags the average down by a lot more than a 5-star review lifts it. At 4.8, it takes nineteen happy customers who bother to write a review to undo one unhappy one. That is why businesses with a high rating cannot rely on the few customers who review on their own.
| Your rating | 5-star reviews to cancel one 1-star |
|---|---|
| 4.0 | 3 |
| 4.3 | 5 |
| 4.5 | 7 |
| 4.7 | 13 |
| 4.8 | 19 |
| 4.9 | 39 |
Closing the gap
Where the extra reviews come from
Your happy customers already exist. Most of them simply never get asked at a moment when leaving a review takes ten seconds.
- 01
On the counter, while they pay
The customer is standing there, happy, phone in hand. A QR code next to the card terminal turns that moment into a review in one scan.
- 02
On the receipt or the bag
A small QR on what they take home catches the ones who are in a hurry. They scan it later, on the sofa, when they have a minute.
- 03
By text, the same day
For appointments and deliveries, send your review link within an hour. One short message, one link, one ask.
A review QR code that counts its own scans
ReviewQR prints your review link as a QR code on cards, stickers and table tents, with your logo and colors, and shows scans per day so you know which spot brings the reviews. From $10/month, 14-day free trial, cancel anytime.
FAQ
Google rating questions
How do I calculate how many 5-star reviews I need?
Multiply your number of reviews by the gap between the rating you want and the rating you have, then divide by the gap between 5 and the rating you want. Round up. For 87 reviews at 4.2 aiming for 4.5: 87 × 0.3 ÷ 0.5 = 52.2, so 53 five-star reviews. The calculator on this page does it for you and pulls your current numbers from Google.
How does Google calculate my star rating?
Google shows the average of the star ratings on your Business Profile, rounded to one decimal. The exact average behind it is not public, so any calculator, including this one, can be off by a few reviews. Reviews Google filters out as spam do not count.
Why does one bad review hurt so much?
Because every review pulls the average toward its own score. A 1-star review sits 3.5 points below a 4.5 average, a 5-star review only 0.5 above it, so it takes seven five-star reviews to undo one 1-star review at 4.5, and nineteen at 4.8. The higher your rating, the more each bad review costs.
Can I delete negative Google reviews instead?
Only if the review breaks Google policy, for example spam, a conflict of interest or offensive content, and then you can report it and Google decides. An honest bad review stays. The reliable way to dilute it is more reviews from your happy customers.
What is a good Google rating for a small business?
Most customers compare you with the other businesses on the same map screen, so the real benchmark is your local competitors. Above 4.5 with a steady flow of recent reviews reads as trustworthy. A perfect 5.0 with few reviews can look less believable than a 4.7 with hundreds.
Is it allowed to ask customers for reviews?
Yes. What Google forbids is paying or giving discounts for reviews, writing them yourself, or only asking the customers you expect to be happy. Ask everyone the same way and let them rate honestly.
You know the number. Now ask every customer.
Put a review QR code where customers pay and watch the scans add up toward your target.