This tool calculates the average star rating based on the number of 1, 2, 3, 4 and 5 star ratings.
Enter the number of each below and the calculator will find the average star rating.
Background
Star ratings are everywhere — from product reviews on e-commerce sites to ratings for hotels, apps, and restaurants.
An average star rating is a single value that represents the overall rating of a product or service based on multiple reviews. It gives users a quick idea of how others feel about the item in question, making it a useful metric in decision-making.
For example:
- A 5-star ⭐⭐⭐⭐⭐ rating indicates excellence.
- A 1-star ⭐ rating typically signals dissatisfaction.
Example Applications
- Customer Decision-Making: Users rely on average star ratings to make informed choices about products and services.
- Business Reputation: Higher ratings can boost sales and attract customers, while lower ratings may deter potential buyers.
- Comparison: Allows users to compare similar products or services quickly.
How to Calculate the Average Star Rating
The formula for calculating the average star rating is straightforward:
Average Rating = Weighted Sum of All Ratings/Total Number of Ratings
Step-by-Step Example
Suppose a product has the following reviews:
- 5 stars: 40 reviews
- 4 stars: 30 reviews
- 3 stars: 20 reviews
- 2 stars: 10 reviews
- 1 star: 5 reviews
Step 1: Multiply the Star Value by the Number of Reviews
Total for 5 stars = 5⋅40 = 200
Total for 4 stars = 4⋅30 = 120
Total for 3 stars = 3⋅20 = 60
Total for 2 stars = 2⋅10 = 20
Total for 1 star = 1⋅5 = 5
Step 2: Sum Up the Total Ratings
Sum of Ratings=200+120+60+20+5=405
Step 3: Count the Total Number of Reviews
Total Reviews=40+30+20+10+5=105
Step 4: Divide the Total Ratings by the Total Reviews
Average Rating = 405/105 ≈ 3.86
So, the average star rating for this product is 3.86 out of 5.