Last Updated: Feb 10, 2021
Why does Google show a 4.8 rating when I have all 5-star reviews? It is a question that comes up repeatedly on Mike’s blog and in the forums. If you’re wondering why your review score average on Google doesn’t match up with the actual reviews left on the listing, the likely reason is that the score doesn’t update in real-time and you need to wait a few days for it to reflect the average after new reviews have been left.
Google, on its help page says:
The review score is calculated from user ratings and a variety of other factors. These calculations make sure the overall score best reflects the quality of the business or place. After someone leaves a new review, it may take up to 2 weeks to get an updated review score.
In the past, Google used to use something like the Bayesian average which made things very confusing for people that were trying to figure out how the average rating got calculated. If, like in the screen shot, you have eight reviews that are all 5-star reviews you would be hard pressed to come up with 4.9 average if you did the math. They stopped using this in 2017 and switched to a simple arithmetic average.
If you want to confirm the average rating is correct based on the number of reviews left, you can use this handy tool.
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