Free business calculator
Review Rating Confidence Range Calculator
Show how much an average star rating may move when the review count is still small.
- Instant results
- Private in your browser
- PDF report included
Use the result well
A clear answer, with the assumptions visible
These recommendations turn the result into an operational next step without hiding the inputs behind a score.
- 1
Use the actual spread of individual ratings when available.
- 2
Read review themes instead of judging quality from one average.
- 3
Report the rating count beside the average.
How this tool works
- Use the entered average, review spread, and count.
- Get a Student t critical value from jStat.
- Build a confidence range and keep it inside the 1-to-5 star scale.
Build it in Bookify
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