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Confidence Interval Calculator

Calculate a confidence interval around a sample mean.

Preparing Confidence Interval Calculator
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Input
Use sample mean, standard deviation, sample size, and confidence level. You will see the result first and the step-by-step solution below.
Input summary
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Step by Step Calculation

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Calculate first and the full working will appear below automatically.

How to use Confidence Interval Calculator

Enter the values you know, tap Calculate to see the result first, then review the optional step-by-step solution below.

What this calculator is for

Use sample mean, standard deviation, sample size, and confidence level.

Tips

  • Use clean numbers and symbols so the solver reads them correctly.
  • For lists, separate numbers with commas, spaces, or new lines.
  • For matrices, put each row on a new line.

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