Survey Sample Size Calculator

Calculate a sample, explore review themes, or redact common personal details. All processing stays in your browser.

Population size

Confidence level

Margin of error

Recommended sample

383

completed responses

3,830invites @10%

1,915invites @20%

1,277invites @30%

Uses a 50% assumed proportion, normal approximation and finite population correction for a simple random sample. The margin applies to proportions, not NPS. Nonresponse and selection bias are not included. Invitations may exceed your population at low response rates.