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Z-score and p-value calculator
Z-score, percentile and p-value from a value, mean and standard deviation.
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About Z-score and p-value calculator
Enter a value, the mean and the standard deviation to get the z-score, z = (x - mean) / sd, along with the percentile and p-value. A z of 1.96 marks the 95 percent two-sided cutoff. Good for comparing scores from tests with different scales or checking outliers.
How to use Z-score and p-value calculator
- Enter your value, the mean and the standard deviation.
- Check the z-score calculated for your value.
- Read the percentile and p-value that go with it.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
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Frequently asked questions
What does a z-score of 2 mean?
The value sits two standard deviations above the mean. That is roughly the 97.7th percentile in a normal distribution, so only about 2.3 percent of values are higher.
How is a z-score calculated?
Subtract the mean from your value and divide by the standard deviation. The result shows how many standard deviations the value sits from the mean.
What is the difference between one-tailed and two-tailed p-values?
A one-tailed p-value looks at one direction only, while a two-tailed one counts extreme results on both sides, so it is roughly double. Use two-tailed unless you predicted a direction.
Is Z-score and p-value calculator free?
Yes. Z-score and p-value calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Z-score and p-value calculator on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.