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Five-Star Rating Summary Calculator — result sheet
Calculate review count, average star rating, and share of four-or-five-star ratings from star counts.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Average=sum(stars×count)/total reviews; favorable share=(4-star+5-star)/total reviews.
The summary exposes both central tendency and a favorable-rating share instead of hiding distribution shape behind one average.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- 1-star count — minimum 0; maximum 1000000000
- 2-star count — minimum 0; maximum 1000000000
- 3-star count — minimum 0; maximum 1000000000
- 4-star count — minimum 0; maximum 1000000000
- 5-star count — minimum 0; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| 1-star count | 2 |
| 2-star count | 3 |
| 3-star count | 5 |
| 4-star count | 20 |
| 5-star count | 70 |
Total reviews =100; average =4.53; favorable share =90%.
Assumptions and limits
- Counts are nonnegative whole numbers and each review has one star value.
- The five labels are equally spaced rating categories.
- Selection bias, review authenticity, weighting, and uncertainty are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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