Z-Score Calculator
How many standard deviations a value is from the mean.
Result
Z-score
2.00
How it works
z = (value − mean) ÷ standard deviation
The z-score standardizes a value: it tells you how far it sits from the average, in units of standard deviation. z = 0 is exactly average; z = 2 is well above.
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Frequently asked questions
What does a z-score mean?
It is the distance from the mean in standard deviations — positive is above average, negative below.
What z-score is unusual?
Roughly |z| > 2 covers only ~5% of a normal distribution, so it is considered uncommon.
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