Your rating
Uses a simple average. Amazon’s displayed rating comes from a machine-learned model that weighs recency, verified purchases and helpful votes, so real results differ.
How the reviews needed math works
The formula
ratings × (target − current) ÷ (5 − target)Each new 5-star rating pulls the average up. The closer the target is to 5, the more you need.
Amazon weights ratings
Amazon doesn’t show a plain average. Newer ratings, verified purchases and helpful reviews count more, so treat this as a guide.
Ratings count, not just reviews
Star-only ratings without text count toward your rating too.
Frequently asked questions
How many 5-star reviews to go from 4.0 to 4.5?
With 100 ratings, 100 more 5-star ratings (simple average). The formula is ratings × (4.5 − 4.0) ÷ (5 − 4.5).
Why doesn’t my Amazon rating match the average?
Amazon uses a machine-learned model that weighs recency, verified purchases and helpful votes. A simple average is only an estimate.
Can I ask buyers for 5-star reviews?
No. Amazon bans asking for positive reviews or offering anything for them. Use the Request a Review button or Amazon Vine instead.
Can I reach 5.0 stars?
Only if every rating is 5 stars. With any lower rating on file, the average can get close but never reach 5.0.