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Confidence Interval Calculator

Get precise confidence intervals for means, proportions, or differences of means with our dynamic, interactive Confidence Interval Calculator. Ideal for quick, reliable statistical analysis.

Mean (Z/T)

Proportion

Difference of Means

Confidence Interval for Mean

Sample Mean ( x̄ )

Sample Size (n)

Standard Deviation (σ or s)

Confidence Level (%)

Population Standard Deviation Known?

Confidence Interval for Proportion

Number of Successes (X)

Sample Size (n)

Confidence Level (%)

Difference of Means (Independent Samples)

Mean 1 ( x̄₁ )

Mean 2 ( x̄₂ )

Std. Dev 1 (s₁)

Std. Dev 2 (s₂)

Sample Size 1 (n₁)

Sample Size 2 (n₂)

Confidence Level (%)