abancp

Amazone use machine learning models to calculate rating of products . we can use simple average algorithms like this

(5* Number of 5star  + 4 * Num of 4star + 3 * Num of 3star + 2 * Num of 2star + 1 * Num of 1star) / ( total number of ratings )

eg :
      total number of ratings : 3790
      5 star rating : 2373
      4 star rating : 651
      3 star rating : 268
      2 star rating : 77