basic

Z-score Calculator

Convert a raw value into a z-score using the mean and standard deviation of its distribution, and look up the corresponding probability.

Daniel Oh By Daniel Oh
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

z = (x − μ) / σ

In depth

Convert a raw value into a z-score using the mean and standard deviation of its distribution, and look up the corresponding probability.