Star Rating Calculator
Calculate how many 5-star reviews you need to reach your target rating
Precise Math
See exactly how many reviews you need
Set Goals
Plan your path to a better rating
Track Progress
Understand how ratings change over time
Calculate Your Review Goal
Enter your current rating and see how many 5-star reviews you need to reach your target.
Why Your Star Rating Matters
Consumer Behavior
- • 94% of consumers avoid businesses below 4 stars
- • Each 1-star increase can boost revenue by 5-9%
- • 4.5+ stars leads to 28% more clicks in search
SEO Impact
- • Google uses ratings in local search ranking
- • Higher ratings = more visibility in Maps
- • Review quantity and recency also affect ranking
How to Calculate Your Average Star Rating
The average star rating formula is straightforward: multiply the number of reviews at each star level by that star value, sum them all, then divide by the total number of reviews.
For example, a business with 50 five-star, 20 four-star, 10 three-star, 5 two-star, and 15 one-star reviews has a total of (250 + 80 + 30 + 10 + 15) = 385 star points across 100 reviews, giving an average of 3.85 stars.
How Many 5-Star Reviews Do You Need to Raise Your Rating?
The number of new 5-star reviews needed depends on your current rating, your total review count, and your target. The more reviews you already have, the more new ones you need — each additional review has less impact on the average.
~5 reviews
To go from 4.0 → 4.5 with 20 existing reviews
~25 reviews
To go from 4.0 → 4.5 with 100 existing reviews
~125 reviews
To go from 4.0 → 4.5 with 500 existing reviews
Use the calculator above to get the exact number for your business. The key takeaway: it's easier to improve your rating when you have fewer reviews, so start collecting 5-star reviews as early as possible.
Star Rating Calculators for Every Scale
The same average-rating math applies whether you measure on a 5-star, 10-star or 100-point scale. Pick the version that matches where your reviews live — the calculator above handles all of them.
5-Star Rating Calculator
The 5-star scale is the default on Google, Facebook, the App Store and Google Play. Enter your current rating and review count to see how many more 5-star reviews you need to reach a target like 4.5 or 4.8.
10-Star Rating Calculator
Some platforms and internal scorecards rate on a 10-point scale. The formula is identical — sum every score and divide by the number of ratings — so the calculator works just as well for a 10-star average; treat each entry as out of 10 instead of 5.
Google Star Rating Calculator
Google shows a business's rating as the simple average of every Google review, rounded to one decimal place. Use this Google star rating calculator to work out how many 5-star Google reviews will move your Business Profile from, say, 4.2 to 4.5.
Average Rating Calculator
To calculate an average rating by hand, multiply the count at each star level by its value, add the results, and divide by the total number of reviews. The calculator does this instantly and also tells you how many more reviews you need to hit your goal.
Automate Your Review Collection
ReviewSense automatically requests reviews from happy customers, helping you steadily improve your rating. Plus, AI-powered responses keep customers engaged.
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