Statistics

Confidence Level Z Value Tool

Convert confidence levels to z critical values and margin of error.

Confidence Level Z Value Tool maps common confidence levels to corresponding normal critical z-values. It is useful when building confidence intervals and hypothesis tests manually. The tool removes lookup-table friction during calculations. Use it as a quick reference utility in statistical workflows.

Confidence Inputs

Result

Alpha: 5.0000%

Critical z*: 1.95996399

Margin of error: 2.93994598

How to use this tool

Enter or select the confidence level.
Run the tool to retrieve the matching z critical value.
Use that value in interval or margin-of-error formulas.

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