Z-Score Calculator
Math ToolsZ-score, percentile and p-value
Embed this tool on your websiteFree
- Choose how tall the frame should be.
- Press Copy code.
- Paste it into your page, blog, WordPress or Notion HTML block.
The tool runs inside your visitor's browser, nothing is uploaded, and a small "Powered by ToolCloak" line stays under it. The second line (script) is optional: it makes the frame fit the tool's height.
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History
All history →Z-Score Calculator — at a glance
See how far a value is from average, in standard deviations.
How to use it — step by step
A value, the mean and the standard deviation.
Enter your numbers
Fill in the fields — sensible example values are already filled in.
Pick your options
Choose any dropdowns or switches that apply to your case.
Calculate Z-Score
Press the button. The result is created instantly on your device.
Read the answer
The main answer is shown big at the top, with details below it.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
What is the formula?+
z = (x − mean) ÷ standard deviation.
Is the percentile exact?+
It is accurate to about 6 decimal places using a standard approximation of the normal curve.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.