Confidence Interval Calculator

Published August 19, 2026

Calculate confidence intervals for means, proportions, and group differences.

Select Calculation Type

Mean
(Single Sample) Proportion Difference
Between Means Difference
Between Proportions

Sample Mean (x̄)

Standard Deviation (s or σ)

Sample Size (n)

Statistical Method

Confidence Interval

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Point Estimate —

Standard Error —

Margin of Error —

Critical Value —

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