Review grade
The review grade is a number based on the stars you receive from customers who leave a review. This rating is displayed in the sidebar, in our widget and on your member profile. Of all the data displayed this grade is one of the most important, it will in many cases contribute to the first impression a customer has of the web store. We are happy to explain how we calculate this grade.
The review grade is built from a "likert scale," in this case consisting of 1 to 5 stars that translate as a grade to a 2 to 10. According to that formula, a score of 3 stars equals a 6. This formula has the effect that a score of 1 star gives the merchant a 2 and not a 1 or 0. We calculate your average score by counting each review equally and thus averaging it.
External sources
You can also display reviews from external platforms on WebwinkelKeur. These reviews count equally strongly in your average. For example, if you have 100 reviews at WebwinkelKeur with an average of 9 and 100 reviews elsewhere with an average of 8, your average score will be 8.5.
Effect of new review on my score: a calculation example
We sometimes get the question how come one negative review changes the score downward, but one positive review does not change the score directly upward. This is usually because your score is already very high. Therefore, that positive review is much closer to the average than a negative review. To illustrate this using an example:
Suppose you are now averaging a 9.7 and have 90 reviews. You get an additional 5-star review. You can then calculate your new score by the following formula:
((9.7*90)+10)/91 = 9.703
Your score remains an average of 9.7.
Suppose you don't get a 5-star review, but a 1-star. Then you can calculate your new average like this:
((9.7*90)+2)/91 = 9.615
So your score now changes to a 9.6. After all, that 1 star deviates much more from your high average.