Confidence Interval Calculator

Calculate confidence intervals for a population mean

Last reviewed: March 2026How we build & verify

Sample Mean (x̄)

Standard Deviation (σ)

Sample Size (n)

Confidence Level

95% Confidence Interval

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Margin of Error

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Z-Value Used

1.96

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Frequently Asked Questions

No. Confidence Interval Calculator is free and works without creating an account. Open the page and start using it.

We check Confidence Interval 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.