App rating calculator

How many 5-star ratings do you need to reach 4.5 stars? Enter your current rating, or look up your iOS app, and see the number for every target.

Ratings needed to reach your target

Works for the App Store and Google Play. Your data stays in your browser.

App Store ratings are per country. Google Play apps: enter the numbers from the Play Console.
    5 = only 5-star ratings

    TargetNew ratings neededTotal ratings then

    Watch every new rating and review arrive in Slack or Microsoft Teams, so you can see the number move.

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    Average rating from star counts

    Enter how many ratings you have for each star level, for example from App Store Connect or the Play Console.

    How the app rating calculator works

    Your app's rating is the average of all its star ratings. To lift it to a target, new ratings have to pull the average up, and every old rating pulls back. The calculator uses this formula:

    New ratings needed = N × (target − current) ÷ (new average − target)

    N is your current number of ratings, and "new average" is the average of the ratings still to come: 5 if you only count 5-star ratings, or something like 4.6 for a realistic mix. If new ratings average below your target, the target can't be reached, however many there are.

    Example: an app with 1,000 ratings and a 4.2 average needs 1,000 × 0.3 ÷ 0.5 = 600 new 5-star ratings to reach 4.5. If new ratings average 4.8 instead, it needs 1,000.

    What the result means on each store

    More on how ratings work in app ratings and reviews.

    How to get more 5-star ratings

    1. Ask at the right moment. Use the in-app review prompt right after a success, never on first launch.
    2. Fix what low ratings complain about. Read the text of the reviews, count the themes, fix the top one.
    3. Reply to unhappy users. A helpful developer response often turns a one-star review into a better one. Use the review reply generator for a first draft.
    4. Catch problems early. A bad release costs dozens of ratings a day; seeing new reviews as they arrive in Slack or Teams shortens the damage.

    Read more in how to get more app reviews.

    FAQ

    How many 5-star ratings do I need to raise my app rating?

    Use the formula needed = N × (target − current) ÷ (5 − target), where N is your current number of ratings. Example: 1,000 ratings at 4.2 need 1,000 × 0.3 ÷ 0.5 = 600 new 5-star ratings to reach 4.5. The calculator above does this for any numbers.

    How do I calculate an average star rating?

    Multiply each star level by the number of ratings it got, add the results and divide by the total number of ratings: (5×a + 4×b + 3×c + 2×d + 1×e) ÷ (a+b+c+d+e). Use the second calculator on this page to do it from your star counts.

    Why does my rating move so slowly?

    Because every new rating is averaged with all the old ones. The more ratings an app has, the more new ratings it takes to move the average by 0.1. On the App Store, a rating reset with a new version starts the average again.

    Is this exact for Google Play?

    It is an estimate. Google Play gives more weight to recent ratings and shows ratings per country and device, so recent good ratings move it faster than a plain average suggests. On the App Store, the rating per country is a plain average unless you reset it.

    How do I get more 5-star ratings?

    Ask happy users at the right moment with the in-app review prompt, fix what low ratings complain about, and reply to unhappy reviews. More in how to get more app reviews.

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