Confidence Interval Calculator

Compute 90%, 95%, and 99% confidence intervals for population means and survey sample proportions.

Sample Mean (x̄)

Sample Standard Deviation (s)

Sample Size (n)

Confidence Level

Confidence Interval Range

Margin of Error (E) = ±3.675

Standard Error (s / √n):1.875

How to Use

Enter the sample mean, sample standard deviation, sample size and confidence level.
Select Confidence Interval to view the confidence interval range.