Google Business Profile Star Rating Calculator

How to calculate Google Business Profile Review score calculator?

This calculator estimates how many additional 5-star reviews are needed to reach a desired average rating on your Google Business Profile.

Key formula: x = ceil( n * (t - r) / (5 - t) ) where r = current average rating, n = number of current reviews, t = target average, and x = required additional 5-star reviews.

Using the Google Business Profile Review score calculator calculator: an example

Example values: current average 3.8 with 100 reviews, target average 4.5.

Step-by-step calculation:

1. Set variables: r = 3.8, n = 100, t = 4.5.
2. Compute numerator: n * (t - r) = 100 * (4.5 - 3.8) = 100 * 0.7 = 70.
3. Divide by (5 - t): 70 / (5 - 4.5) = 70 / 0.5 = 140.
4. Round up: x = ceil(140) = 140, so you need 140 additional 5-star reviews to reach a 4.5 average.

Frequently Asked Questions

Does the calculator assume all new reviews are 5-star?

Yes. The result shows how many additional 5-star reviews are required; if new reviews are lower than 5 stars, you will need more to reach the same target.

Can existing low ratings make some targets impossible?

Extremely high targets like a perfect 5.0 may be impossible if you already have reviews below 5.0, because new 5-star reviews cannot raise the average to 5.0 unless all existing reviews are also 5 stars.

What if I receive a mix of ratings, not only 5-star reviews?

If incoming reviews include ratings below 5, update the inputs with expected mix or run multiple scenarios; the required count of 5-star reviews will increase if some new reviews are lower.

Should I focus on review quality or quantity?

Both matter. Encouraging more genuine 5-star reviews improves your average faster, but addressing issues that cause low ratings will sustain higher averages over time.