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Confidence Interval Calculator

by Tutor Aspire

This calculator creates a confidence interval for a population mean using the following formula:

Confidence Interval = x +/- z*(s/√n)


  • x: sample mean
  • z: z-value that corresponds to confidence level
  • s: sample standard deviation
  • n: sample size

To create a confidence interval for a population mean, simply fill in the values below and then click the “Calculate” button:

90% Confidence Interval: (5.896, 28.104)

95% Confidence Interval: (3.770, 30.230)

99% Confidence Interval: (-0.388, 34.388)

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