Free business calculator
Survey Margin of Error Calculator
See how much a survey percentage may move because only part of the group answered.
- 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
Make the question neutral and easy to understand.
- 2
Reach people across the full group, not only the easiest respondents.
- 3
Report the response count beside every percentage.
How this tool works
- Convert the measured share to a proportion.
- Use jStat’s normal critical value and binomial standard error.
- Apply a finite-population correction when the full group is known.
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