How to calculate your average Google review rating?
Your business's Google rating is based on a simple arithmetic average. Google adds up all the ratings (from 1 to 5 stars), then divides the total by the number of reviews received.
The exact formula:
Average rating = (sum of all ratings) / (total number of reviews)
To estimate how many 5-star reviews you need to reach a target rating, the calculation becomes:
(current rating x number of reviews + 5 x new reviews) / (number of reviews + new reviews) >= target rating
That's exactly what our calculator above does. For example, if you have a rating of 4.1 with 47 reviews and you're aiming for 4.5, you'll need 38 additional 5-star reviews.
Why this calculation matters
The more reviews you have, the harder it becomes to move your rating. A business with 200 reviews needs far more 5-star reviews than one with 30 reviews to gain that same 0.1 point. Knowing this number lets you set realistic goals and track your progress.
Why your Google rating is critical for your business
Your Google rating has a direct impact on your revenue. Here are the three main reasons why.
Impact on local SEO
Google reviews are among the most important ranking factors for the Local Pack (the 3 results shown on Google Maps). According to the Moz Local Search Ranking Factors 2023 study, review-related signals (volume, rating, frequency) account for roughly 17% of the total weight in local rankings.
A business with a rating above 4.2 and a steady stream of new reviews will naturally rank above a lower-rated competitor.
Impact on click-through rate
According to a BrightLocal study (Local Consumer Review Survey, 2024), 87% of consumers read online reviews for local businesses. Among them:
- 57% only consider businesses with a rating of 4 stars or higher
- 73% only take recent reviews into account (less than 3 months old)
- 49% trust online reviews as much as personal recommendations
In practice, a business rated 3.7 loses more than half of its potential visitors to a competitor rated 4.4.
Impact on trust and conversion
Your Google rating acts as a trust filter before a customer even walks through the door. Research from SOCi (State of Google Reviews, 2024) shows that the average number of reviews per business on Google grew 15% between 2023 and 2024. Consumers actively compare ratings across local competitors.
A 0.3-point gap between two similar businesses can shift 30% of customer traffic toward the higher-rated one.
How many reviews does it take to improve your Google rating?
Here are a few real-world scenarios calculated with our tool. The number of 5-star reviews you need depends on two factors: your current rating and your existing review volume.
Scenarios for a business with 50 reviews
| Current rating | Target rating | 5-star reviews needed |
|---|---|---|
| 3.5 | 4.0 | 17 |
| 3.8 | 4.5 | 59 |
| 4.0 | 4.5 | 50 |
| 4.2 | 4.5 | 19 |
| 4.3 | 4.5 | 14 |
Scenarios for a business with 150 reviews
| Current rating | Target rating | 5-star reviews needed |
|---|---|---|
| 3.5 | 4.0 | 50 |
| 3.8 | 4.5 | 175 |
| 4.0 | 4.5 | 150 |
| 4.2 | 4.5 | 57 |
| 4.3 | 4.5 | 43 |
What these numbers tell us
- Acting early is more efficient. A business with 50 reviews needs 3 times less effort than one with 150 reviews for the same rating gain.
- Each tenth of a point costs more. Going from 4.0 to 4.2 is much faster than going from 4.2 to 4.5.
- Prevention beats cure. It's better to maintain a high rating with a steady stream of reviews than to attempt a costly recovery later.
You can also audit your Google Business Profile to identify other levers that impact your local visibility.
Want to reach your target rating faster?
Up Review helps businesses collect up to 5 times more Google reviews through the prize game and automation.
How to get more reviews on Google quickly?
Raising your Google rating comes down to two levers: getting more positive reviews and improving your service quality to reduce negative ones.
Ask at the right time
The best time to ask for a review is right after a positive experience. The customer is satisfied, and they're still at your business or have just left. Response rates drop by 80% if you wait more than 24 hours (source: ReviewTrackers, 2023).
Simplify the process
Every extra step between the request and the review being posted cuts your conversion rate in half. A direct link to your Google listing, accessible in one click (QR code, SMS, email), is essential.
Automate collection
Businesses that use an automated collection system get 4 to 6 times more reviews on average than those relying on manual requests. That's the difference between 5 reviews a month and 25.
Respond to every review
Responding to reviews (both positive and negative) shows Google that your listing is active and well maintained. Listings that respond to more than 50% of reviews get a better local ranking, according to Moz data.
Use multiple channels
SMS, email, QR code on tables or at the counter, NFC plate, prize game: each channel reaches a different type of customer. Varying your touchpoints maximizes your collection volume.
To set up a structured, automated collection strategy, discover how Up Review helps businesses multiply their Google reviews.
You can also check out our complete guide to collecting customer reviews or our comparison of the best Google review management tools in 2026.