Confidence Interval Calculator

Name: Confidence Interval Calculator
Rating: 4.9 (1043 reviews)

Calculate confidence interval for a sample mean.

Calculator

Sample Mean (x̄)

Sample Std Deviation (s)

Sample Size (n)

Confidence Level

Result

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A 95% CI means: in 100 repeated studies, ~95 intervals would contain the true population mean. Wider CI = more confidence but less precision.