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Confidence Interval Calculator

Calculate confidence intervals for means and proportions at 90%, 95% or 99% confidence levels.

Sample Mean (x̄)

Std Deviation (s)

Sample Proportion (%)

Sample Size (n)

Confidence Level

Lower Bound

Upper Bound

Margin of Error

Critical Score

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About Confidence Interval Calculator

Our free Confidence Interval Calculator helps you run quick, accurate calculations for everyday financial and mathematical needs with just a few inputs. Calculate confidence intervals for means and proportions at 90%, 95% or 99% confidence levels. Enter your values, and the calculator instantly shows detailed results with breakdowns you can understand. No signup, no ads interrupting your workflow — just accurate, reliable calculations you can trust. Works on any device, saves nothing to our serv...

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