FREE ONLINE CALCULATOR / STATISTICS
95% Confidence Interval Calculator
Estimate a 95% normal-approximation confidence interval for a mean. Fast, private, and built to make every number easier.
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✦ InteractiveHow does this calculator work?
Estimate a 95% normal-approximation confidence interval for a mean. Edit the inputs and see the computed results. All calculations take place inside your browser, without submitting values to a server.
Mean ± 1.96×s/√n
Note: Uses z≈1.96 rather than a small-sample t interval.
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