Sample size calculator
Sample size calculator
Plan survey responses or estimate the margin of error of an existing sample.
Result
- Formula
- n = z^2 x p x (1-p) / e^2
- Finite population correction
- No
| Formula | n = z^2 x p x (1-p) / e^2 |
|---|---|
| Finite population correction | No |
Responses needed at different margins
- Margin of error
- 1%
- Sample size
- 9,604
- Estimated invitations
- 12,005
- Margin of error
- 3%
- Sample size
- 1,068
- Estimated invitations
- 1,335
- Margin of error
- 5%
- Sample size
- 385
- Estimated invitations
- 482
- Margin of error
- 10%
- Sample size
- 97
- Estimated invitations
- 122
Survey sample size calculator
The calculator is useful for quick planning of surveys, polls, research checks and product feedback samples.
Statistical assumptions matter; use professional methods for high-stakes research.
Plan a survey sample or estimate its margin of error.
- Choose sample-size or margin mode
- Set confidence, expected proportion and population
- Calculate, check invitations and export the comparison
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