Free calculator tool
Google Review Rating Calculator
Enter your current Google rating, your current review count, and your target rating. The calculator tells you exactly how many new 5-star reviews you need to hit your goal. Then launch a campaign in Get More Review to collect them.
Your current average star rating on Google
Total reviews shown on your Google Business Profile
The rating you want to achieve
to increase from 3.8 to 4.5 with 24 current reviews
How it works
The formula behind the calculator
Your Google rating is a weighted average of all your reviews. To change your average, you need to add enough 5-star reviews to pull the total average up to your target.
The formula works as follows: multiply your current rating by your current review count to get your total score. Then work out how many 5-star reviews are needed so that the new total divided by the new review count equals your target rating.
Formula
New reviews needed =
(Target × (Current count + X) − (Current rating × Current count)) ÷ (5 − Target)
The calculator rounds up to the nearest whole number because you cannot have a fraction of a review. Google also rounds displayed ratings to one decimal place, so the calculator accounts for rounding at the target rating.
Examples
| Current rating | Reviews now | Target | New 5-stars needed |
|---|---|---|---|
| 3.5 ★ | 15 | 4 ★ | 8 |
| 3.8 ★ | 24 | 4.5 ★ | 34 |
| 4 ★ | 50 | 4.5 ★ | 50 |
| 4.2 ★ | 80 | 4.7 ★ | 134 |
| 4.5 ★ | 120 | 4.8 ★ | 180 |
| 4.5 ★ | 120 | 4.8 ★ | 180 |
Ethical tips
How to collect those new 5-star reviews ethically and quickly
Ask within 24 hours of the visit
Response rates drop sharply after a day. An automated review request sent the same evening or the next morning gets 3 to 5 times more responses than one sent a week later.
Use WhatsApp or SMS, not just email
Email response rates average 12%. WhatsApp averages 44%. In markets where WhatsApp is common (UAE, India, Europe), WhatsApp campaigns collect reviews significantly faster than email alone.
Use smart routing to protect your average
Smart routing sends happy customers (4 to 5 stars) to Google and catches unhappy ones privately. Over time this means the reviews that accumulate on Google trend toward 5 stars, pushing your average up faster.
Never offer incentives for reviews
Offering discounts or free items in exchange for reviews is against Google's policies and can get your Business Profile penalised. Focus on timing and convenience, not rewards.
Follow up with non-responders
A single request gets a fraction of the responses a 4-step follow-up sequence gets. Customers get busy. A polite reminder 3 days later significantly improves your total review count.
Place QR codes at the right moment
For physical businesses, a QR code at the point of checkout catches customers in the peak satisfaction window. Table cards, receipt inserts, and appointment cards all work well.
Related tools
Tools to help you collect those reviews
Frequently asked questions
Common questions about improving your Google rating
Use the calculator above. Enter your current rating, current review count, and target rating. The calculator applies the weighted average formula to tell you exactly how many new 5-star reviews you need. The formula is: New reviews = (Target × (Current count + X) minus (Current rating × Current count)) divided by (5 minus Target).
The number depends on your current review count. A business with 20 reviews at 4.0 needs approximately 20 new 5-star reviews to reach 4.5. A business with 100 reviews at 4.0 needs approximately 100 new 5-star reviews. The more reviews you already have, the harder it is to move the rating. Use the calculator above for a precise answer for your specific situation.
It depends on how many reviews you collect per week. With Get More Review sending automated requests to every customer, most businesses collect 10 to 40 new reviews per month. A business that needs 30 new 5-star reviews and collects 20 per month would reach its goal in 6 to 8 weeks.
Yes. Get More Review's smart routing sends customers who rate 4 to 5 stars to Google while catching lower-rating customers in a private inbox. Over time the reviews that accumulate on Google are more representative of your best experiences, pushing your average rating upward.
A rating of 4.5 or above combined with a consistent flow of recent reviews generally places a business competitively in local search and Google Maps results. Businesses with ratings below 4.0 or with no reviews from the past 30 days consistently underperform in local rankings.
Calculate and then go collect those reviews.
Get More Review sends automated review requests by WhatsApp, SMS, email, and QR code. Smart routing sends happy customers to Google. Free to start. No credit card required.