Star Rating Calculator
Free CalculatorTurn your 5-star to 1-star review counts into a weighted average rating, just like the App Store and Google Play show it.
100% private
Runs in your browser β no numbers leave your device.
Your reviews
Number of 5-star reviews you have received.
Number of 4-star reviews you have received.
Number of 3-star reviews you have received.
Number of 2-star reviews you have received.
Number of 1-star reviews you have received.
Average rating
4.35
Weighted mean across all star levels, out of 5.
Total reviews
1,000
Sum of all reviews across every star level.
How it works
Enter your review counts
Type how many reviews you have at each star level, from 5 down to 1.
Weight each level
Every count is multiplied by its star value: 5, 4, 3, 2 or 1.
Divide by the total
The sum of all weighted values is divided by the total number of reviews.
Read your average
The result is your live star rating, out of 5, updated as you type.
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What is a star rating calculator?
A star rating calculator turns your review counts into a single weighted average, the same number the App Store and Google Play display beside your app. Instead of a simple headcount, each review is weighted by its star value β a 5-star review adds 5 points, a 1-star review adds just 1 β and the total is divided by the number of reviews. That is why 100 five-star reviews and 100 one-star reviews average to 3.0, not a flattering number.
Understanding the weighted math shows you exactly how many 5-star reviews it takes to move the needle. Once you have a large base of reviews, a single new rating barely shifts the average, so early ratings matter far more than later ones. Use this calculator to model different scenarios, set realistic targets, and see how many happy users you need to recover from a run of bad reviews.