Margin of Error Calculator

Добавлено 2026-08-29Обновлено 2026-10-03

Calculate margin of error for a mean or proportion at a chosen confidence level.

✓ Runs locally in your browser✓ No account or dataset upload required✓ Effect sizes / uncertainty shown where appropriate

Margin of error for

Sample SD (mean)

Sample size n

Expected proportion (0–1)

Confidence level

Margin of error

—

Critical value

—

Standard error

—

Statistical output is a calculation aid. Check assumptions, study design and reporting requirements before drawing scientific conclusions.

Об этом инструменте

Calculate margin of error for a mean or proportion at a chosen confidence level.

Common uses

confidence level margin of errorsample mean margin of errorproportion margin of errorcalculate margin of error

Как это работает

1Enter or paste the requested sample values, summary inputs or contingency data.
2Choose the method, confidence level or test options when available, then run the calculation.
3Review the estimate/test statistic together with p-value, confidence interval, effect size and method notes where available.

Does this statistics calculation upload my data?

No. Entered values are processed locally in your browser with JavaScript.

Should I interpret statistical significance by itself?

No. Review effect size, confidence intervals, study design, assumptions, sampling and multiplicity together with the p-value.