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The weighted average multiplies each source's rating by its review count, adds those products together, then divides by the total number of reviews across all sources. A source with 500 reviews at 4.2 stars pulls the blended number toward 4.2 far more than a source with 8 reviews at 5 stars, which is exactly the point: a rating backed by more reviews is more statistically reliable and should carry more influence over the combined score.
A simple average treats every source equally regardless of how many reviews back it, so a platform with 3 five-star reviews counts exactly as much as one with 800 reviews averaging 4.3 stars. This tool shows both numbers side by side specifically so you can see how much that unweighted approach would overstate or understate your real standing once review volume is accounted for.
A blended rating across platforms, like Google, Facebook, an industry directory and your own site, can be a useful internal benchmark for tracking overall reputation over time. It should not be presented publicly as if it were a single platform's official rating, and each platform's own review widget should still show that platform's real, unmodified rating and count.
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