What This Calculator Does
This calculator computes the true weighted average of a set of star ratings, which is the number customers actually see next to a product or business on most review platforms.
The Formula
Each star level is multiplied by how many reviews received that rating, the results are summed, and the total is divided by the number of reviews:
- Average Rating = (1×n1 + 2×n2 + 3×n3 + 4×n4 + 5×n5) / (n1 + n2 + n3 + n4 + n5)
This weighted approach is more accurate than simply averaging a handful of visible reviews, because it accounts for how many reviews landed at each star level rather than treating every star level as equally common. Use this for general reporting and planning purposes.
Last reviewed August 2026