Statistics

Confidence Interval Calculator

Estimate confidence intervals from mean, standard deviation, and sample size.

Confidence Interval Calculator estimates a confidence interval around a sample mean using sample stats. It is useful for expressing uncertainty in reports and experiments. The tool turns point estimates into bounded ranges. Use it to communicate estimate precision rather than single values only.

Confidence Interval Inputs

Interval

Margin: 5.3677

Lower: 94.6323

Upper: 105.3677

How to use this tool

Enter sample mean, standard deviation, sample size, and confidence level.
Run calculation to compute interval bounds.
Report interval alongside assumptions and sampling method.

Statistics learning resources

Feature statistics textbooks, data analysis courses, and research templates.

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