Z-Score Calculator
How many standard deviations a value sits from the mean.
Inputs
Formula
- z = (x − μ) / σ
A z-score standardises any value so different data sets can be compared on one scale.
Step-by-step calculation
- 1
Z-score
(85 − 70) / 10
1.5
Frequently asked questions
What does the Z-Score Calculator do?
How many standard deviations a value sits from the mean. The Z-Score Calculator on OneCalcApp returns the result instantly as you type, together with the formula and the substituted values.
How do I use the Z-Score Calculator?
Enter your values in the input fields, choose the relevant units or options, and the Z-Score Calculator recalculates automatically. You can copy, print or export the result.
Is the Z-Score Calculator free to use?
Yes. The Z-Score Calculator is completely free, needs no sign-up and has no usage limit on OneCalcApp.
How accurate is the Z-Score Calculator?
It uses the standard formula z = (x − μ) / σ and full double-precision arithmetic, so results match a manual calculation to the displayed number of digits.
Does the Z-Score Calculator work on mobile and offline?
Yes. The Z-Score Calculator runs entirely in your browser on phones, tablets and desktops, and your inputs never leave your device.
Where can I find related tools?
OneCalcApp hosts 300+ calculators and converters, including the full Math collection. Related tools are linked at the bottom of every page.
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