Does the survey margin of error calculator upload my survey numbers?

No. Inputs are processed in your browser, and pasted content is not sent to analytics or a server.

What should I paste into the survey margin of error calculator?

Enter sample size, confidence level, and optionally total population size.

What can I copy or download?

You can copy the margin-of-error summary.

What does the survey margin of error calculator not verify?

It does not account for nonresponse bias, panel quality, weighting, stratified sampling, or poor questionnaire design.

Survey Margin of Error Calculator

Estimate survey margin of error from sample size, confidence level, and optional population size.

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Survey Margin of Error Calculator

Runs in your browser. Inputs are not uploaded.

Survey Margin of Error Calculator Example Run

Estimate survey precision with optional population correction.

Sample inputs
Sample size: 600
Confidence: 95%
Population size: 10000

Generated result
Summary: Estimated margin of error is +/- 3.88 percentage points at 95% confidence.

Stats
- Margin Of Error: 3.88%

Issues
- No issues found.

Output
Sample size: 600
Population: 10000
Confidence: 95%
Margin of error: +/- 3.88 percentage points

What the Survey Margin of Error Calculator Checks

Sample size

The calculator requires a positive number of completed responses.
Confidence level

Common 90%, 95%, and 99% confidence z-values are supported.
Conservative proportion

The estimate uses 0.5 proportion for a conservative margin of error.
Population correction

When population size is provided and larger than sample size, finite-population correction is applied.
Survey design caveat

The result assumes a simple random sample and does not correct for weighting or sampling bias.

Survey Margin of Error Calculator Questions

View all questions

Q: Does the survey margin of error calculator upload my survey numbers? A: No. Inputs are processed in your browser, and pasted content is not sent to analytics or a server.
Q: What should I paste into the survey margin of error calculator? A: Enter sample size, confidence level, and optionally total population size.
Q: What can I copy or download? A: You can copy the margin-of-error summary.
Q: What does the survey margin of error calculator not verify? A: It does not account for nonresponse bias, panel quality, weighting, stratified sampling, or poor questionnaire design.

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Updates

v1.0.0 New 2026-05-17: Initial margin-of-error calculator with finite-population correction added.