Z-Score Calculator

Use the free online Z-Score Calculator tool. Fast, private and easy to use — runs entirely in your browser. Part of our Statistics Calculators collection.

Median & Mode Calculator

Find the median, mode, sum, count, minimum and maximum of any list of numbers.

Standard Deviation Calculator

Get both the population and sample standard deviation of a data set, with the mean shown for context.

Variance Calculator

Measure how spread out a data set is with population and sample variance.

Z-Score Calculator

See how many standard deviations a value lies from the mean with z = (x − μ) / σ.

Permutation & Combination Calculator

Count arrangements and selections instantly — nPr for ordered picks and nCr for unordered ones.

Range Calculator

Find the range of a data set — the difference between its largest and smallest values.

Coefficient of Variation Calculator

Compare the relative spread of data sets with CV = σ / μ expressed as a percentage.

Midrange Calculator

Compute the midrange — the midpoint between the minimum and maximum of a data set.

Frequently Asked Questions

Is the Z-Score Calculator free to use?
Yes. The Z-Score Calculator is completely free with no sign-up, no limits and no watermarks. You can use it as many times as you like.
Is the Z-Score Calculator safe and private?
Absolutely. The Z-Score Calculator runs entirely in your browser, so your data never leaves your device and nothing is uploaded to a server.
Do I need to install anything to use the Z-Score Calculator?
No installation is needed. The Z-Score Calculator works instantly online in any modern browser on desktop, tablet or mobile.
Does the Z-Score Calculator work on mobile phones?
Yes. The Z-Score Calculator is fully responsive and works smoothly on iPhone, Android and any other device.