Z-score Calculator
Calculate a z-score from a value, mean and standard deviation, or recover a value from a z-score.
How to use this calculator
Enter the requested values, then select Calculate. Results are processed locally in your browser for this static website.
Accuracy notes
Results may be affected by rounding, unit conventions and the assumptions shown by the calculator. Verify important calculations independently.
What this calculator solves
Calculate a z-score from a value, mean and standard deviation, or recover a value from a z-score. This page provides the interactive calculation together with a plain-language explanation so the result can be checked against the underlying method.
Science and formulae
z = (x−μ) ÷ σ, expressing how many standard deviations a value lies from the mean.
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