Average Rating Calculator
Calculate a weighted star-rating average from vote counts.
Average Rating Calculator Inputs
Results computed instantly — your data never leaves your device.
Live Average Rating Calculator Results
Real-TimeWeighted average rating
3.08421053
The rating average is weighted by the number of votes at each star level.
How to Use the Average Rating Calculator
- 1
Enter the count of one-star through five-star votes.
- 2
Review the weighted average rating.
- 3
Compare the result with the total vote count.
- 4
Use the estimate as a descriptive summary, not a quality guarantee.
Formula & Mathematical Basis
Variable Key
v₁…v₅Number of votes at each star level
1…5Star value assigned to each rating level
📝 Zero total votes produces a guarded zero; negative vote counts are clamped out of the calculation.
Step-by-Step Examples
Weighted five-star average
Scenario: Use 12 one-star, 18 two-star, 25 three-star, 30 four-star, and 15 five-star votes.
- 1.Add all votes to obtain 100 total ratings.
- 2.Multiply each star value by its vote count.
- 3.Add the weighted scores.
- 4.Divide the weighted score by 100.
Practical Use Cases
- Summarize survey star ratings.
- Compare rating distributions using one number.
- Explain why vote counts matter to an average.
Common Pitfalls
- Ignoring the number of votes behind a rating.
- Treating the average as a fraud or quality detector.
- Entering a score instead of a vote count.
Frequently Asked Questions
What if there are no votes?
The guarded result is zero because no weighted average can be formed.
Does this show review confidence?
No. It summarizes the entered distribution only.
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