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Z-score Calculator

Standardized z-score.

Z-score

z
0.6667
Within ±1σ — typical
P(Z < z)
0.747508
Cumulative — area to the left
P(Z > z)
0.252492
Area to the right (one-tailed)
P(|Z| > |z|)
0.504985
Two-tailed probability
Percentile
74.8%
x ranks above this share of the population
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Z-score Calculator · Generated 5/2/2026 · calccenter.online/calculators/math/z-score

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About the Z-score Calculator

MethodologyHome

Standardized z-score. Use this free z-score calculator to get instant results. All calculations run in your browser — nothing is sent to a server.

Frequently asked questions

What does this Z-score Calculator do?

Standardized z-score.

Is it free?

Yes — every calculator on Calc Center is free, with no sign-up or account required.

Does it work offline?

The site is a Progressive Web App — after your first visit, most pages work without an internet connection.