Explore a rating scenario.
See how the number and average of future reviews affect an assumed starting average. This is a planning calculation, not a target for five-star requests.
Enter your assumptions
What the calculation means
The calculation solves for the number of new reviews needed to reach your target average, assuming every future batch averages the value you enter. Formula: n = ceiling(count × (target − current) ÷ (future average − target)).
If the future average is equal to or below a higher target, that target cannot be reached. With no existing reviews, a first review or batch can meet the target only if its assumed average meets it.
Your Google rating is displayed as a rounded value, so using it as an exact starting average introduces uncertainty. This tool does not reproduce Google’s internal calculation or predict the displayed rating.
Invite honest feedback from every eligible customer. Never request a particular star rating or offer an incentive.
How many 5-star reviews do I need?
The answer depends on your current average, your review count and the average you want to explore. This calculator lets you model five-star future reviews, but you should invite honest feedback from all eligible customers without asking for a specific rating.
Example: from 4.2 to 4.5 with 100 existing reviews
If the starting average is exactly 4.2 and every new review is five stars, 60 new reviews give (420 + 300) ÷ 160 = 4.5. If future reviews instead average 4.8, the same target needs 100 new reviews. These are mathematical scenarios, not forecasts.
Why more existing reviews change the answer
With 200 reviews at exactly 4.2, the five-star scenario needs 120 new reviews to reach 4.5. A larger history gives each new review less influence on the average.
Why Google’s displayed rating may differ
A displayed 4.2 is rounded and may not be your exact underlying average. Two businesses showing 4.2 can therefore need different numbers of new reviews to reach the same unrounded target. Do not treat this calculation as a prediction of Google’s display.
Can I reach exactly 5.0 after a lower rating?
If an existing review is below five stars, adding a finite number of five-star reviews cannot make the mathematical average exactly 5.0. A rounded display and an exact average are different things.
Use the result to improve your process
Review your activity and reply coverage, then make your review link easier to share. A thoughtful response to a four-star review can address useful feedback without chasing a particular score.