How the Google review calculator works
This calculator estimates how many new reviews you need to reach your target average. It uses your current rating, review count, and the expected average of new reviews. Leave that last value at 5.0 for the fewest possible new reviews, or lower it to plan for a mix of ratings. Because Google displays a rounded rating, the result is an estimate.
Say your business has 100 reviews and a 4.2 rating. Reaching a 4.5 average would take an estimated 60 new 5-star reviews: (4.2 × 100 + 5 × 60) ÷ 160 = 4.5. Google may round the score shown on your profile, so use the result as a planning number, not a guarantee.
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Google review calculator questions
How many 5-star reviews do I need to increase my rating?
For a target above your current average and below 5.0, divide your current review count × (target rating − current rating) by (5 − target rating), then round up. For example, 100 reviews at 4.2 need 60 new 5-star reviews to reach 4.5. This assumes every new review is five stars; use the expected-average field for a different mix.
Can a Google rating reach exactly 5.0?
If your current average is below 5.0, new 5-star reviews can move you closer, but they cannot produce an exact 5.0 mathematical average.
Why does my Google rating not change after a new review?
One review may not move the displayed rating when you already have many reviews. Google may also round the average shown on your profile.
Does Google round business ratings?
Google does not show the full underlying average. Because the calculator uses the rating you enter, its result is an estimate.