Google Review Calculator
Find out how many 5-star reviews you need to reach 4.5 stars — or any rating — what one bad review costs you, and how your review count compares with the businesses above you on Google Maps.
1.0–5.0, as shown on Google
To go from 4.2★ to 4.5★ you need
39 more 5-star reviews
That takes you to 124 reviews and an average of 4.45, which Google shows as 4.5★.
5-star reviews needed for each rating
| Target | New 5★ reviews | Total reviews |
|---|---|---|
| 4.3 ★ | 6 | 91 |
| 4.4 ★ | 20 | 105 |
| 4.5 ★ | 39 | 124 |
| 4.7 ★ | 110 | 195 |
Google rounds to one decimal: an average of 4.25 already shows as 4.3★.
What one 1-star review costs
With 85 reviews, a single 1★ review drops your average by 0.037. Google would still show 4.2★. More reviews make your rating harder to knock down.
Your weekly plan
About 4 reviews a week, so ask roughly 40 customers a week (7 a day on a 6-day week). Ask every customer, not only the happy ones.
Compare your Google reviews with local competitors
Find your business and we'll compare its rating and review count with the top 3 Google Maps results for your category nearby — free, no sign-up. You also get your direct Google review link.
How the Google review calculator works
Google shows the average of all your star ratings, rounded to one decimal. To display a target rating T, your average only has to reach T − 0.05. With a current average R over n reviews, the number of new 5-star reviews you need is:
5-star reviews needed = n × ((T − 0.05) − R) ÷ (5 − (T − 0.05)), rounded up
Example: a 4.2★ business with 100 reviews needs46 new 5-star reviews to show 4.5★. Every review that isn't 5 stars pushes that number up, which is why the calculator lets you set a realistic average for new reviews.
How many 5-star reviews to raise your rating
New 5-star reviews needed for common rating goals, by how many reviews you have today:
| Rating goal | 25 reviews | 50 reviews | 100 reviews | 250 reviews | 500 reviews |
|---|---|---|---|---|---|
| 3.8★ → 4.0★ | 4 | 8 | 15 | 36 | 72 |
| 4.0★ → 4.5★ | 21 | 41 | 82 | 205 | 410 |
| 4.2★ → 4.5★ | 12 | 23 | 46 | 114 | 228 |
| 4.3★ → 4.7★ | 25 | 50 | 100 | 250 | 500 |
| 4.5★ → 4.8★ | 25 | 50 | 100 | 250 | 500 |
How many Google reviews do you need?
Enough to compete with the businesses that show above you. Googlesays local results are based on relevance, distance and prominence, and that review count and review score factor into prominence. So the useful benchmark isn't a national average — it's your local top 3. The competitor checker above shows their review counts next to yours and how many reviews a week closes the gap.
Review count
More reviews make your rating more trustworthy and harder to knock down with one bad review.
Star rating
Many shoppers filter or skim by stars. Each 0.1 matters most when you have few reviews.
Steady flow
A steady flow of new reviews shows customers you're active today, not two years ago.
How to get more Google reviews (within Google's rules)
- Ask every customer, in person. Right after they pay, pick up or see the finished job. A personal ask beats a sign on the wall — see ourword-for-word scripts for asking for Google reviews.
- Make it one tap. Send customers straight to your review form, not your listing. AnNFC review card or acounter stand opens it when they hold their phone near it; afree QR code works with any camera.
- Don't filter or reward. Google'sreview policy doesn't allow incentives or asking only happy customers. Ask everyone; honest reviews last.
- Reply to every review. Thank the good ones and answer the bad ones calmly. Future customers read your replies.
- Track it weekly. Set a weekly target from the calculator and check your count every Monday.
Google review calculator FAQ
How is a Google rating calculated?
Your Google rating is the average of all your star ratings: add up every rating and divide by the number of reviews. Google shows it rounded to one decimal, so an average of 4.46 appears as 4.5 stars.
How many 5-star reviews do I need to go from 4.0 to 4.5 stars?
It depends on how many reviews you already have. With 50 reviews at 4.0 you need 41 new 5-star reviews to show 4.5; with 200 reviews you need 164. Enter your own numbers in the calculator above.
How many Google reviews does my business need?
There's no fixed number. What matters is how you compare with the businesses that show above you on Google Maps. Use the competitor checker on this page to see the review count of your local top 3, then set a weekly goal to close the gap.
Does one bad review hurt my Google rating a lot?
The fewer reviews you have, the more one bad review moves your average. With 20 reviews at 4.8, a single 1-star review drops you to about 4.6; with 300 reviews it barely moves. Getting more reviews protects your rating.
Can I offer a discount or gift for Google reviews?
No. Google's policy doesn't allow incentives for reviews, and it doesn't allow asking only happy customers (review gating) either. You can ask every customer for an honest review — and make it as easy as possible.
Where does the competitor data come from?
The checker looks up public Google Maps results for your business category near your address and compares ratings and review counts. Results are shown only to you and aren't published. It's free, with a few checks per day.
Turn happy customers into Google reviews
Customers tap their phone on your card or stand, or scan the QR code, and your review form opens. Your logo, programmed and tap-tested before it ships.