Margin of Error Calculator

Calculate margin of error for population mean or proportion

Last reviewed: March 2026How we build & verify

Type

Confidence Level

Sample Size (n)

Standard Deviation

Margin of Error

—

Z-Score

1.96

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Frequently Asked Questions

No. Margin Of Error Calculator is free and works without creating an account. Open the page and start using it.

We check Margin Of Error Calculator periodically to keep it working correctly and to make small improvements based on how people actually use it. The date at the top of the page shows the last review. Found a bug or have a suggestion? There's a feedback button in the bottom-right corner.