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Z-score Calculator

Free z-score calculator to calculate z-score. Instant results in your browser — no signup.

Also known as: Calculate z-score, z score calculator, standard score, z value, calculate z score calculator, calculate z-score, statistics math, statistics calculate z-score

Direct calculator

Inputs

Results update when you click Calculate.

Z-score

1.5000

z = (85.0000 − 70.0000) / 10.0000

Approx. percentile

93.32%

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What this result means

Free z-score calculator to calculate z-score. Instant results in your browser — no signup. z = (x − μ) / σ measures distance from the mean in standard-deviation units.

Assumptions

  • Rule dependency: Universal formula.

How is it calculated?

z = (x − μ) / σ measures distance from the mean in standard-deviation units.

Example

85 with μ=70, σ=10 → z = 1.5.

Frequently asked questions

Normal required?+

Percentile hint assumes an approximate normal distribution.