Z-Score Calculator
Calculate the z-score (standard score) for a data point and find its percentile ranking in a normal distribution.
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Calculator insights
What this calculator does
Z-Score Calculator helps you quickly estimate calculate the z-score (standard score) for a data point and find its percentile ranking in a normal distribution. with clean output and clear next steps.
How the calculation works
Enter Data Point (x), Population Mean (μ), Standard Deviation (σ) and this calculator uses standard formulas to determine Z-Score and Percentile. The output is displayed immediately in a user-friendly format.
Example calculation
For example, enter realistic values into the Z-Score Calculator to see how the calculator produces Z-Score and Percentile that you can use for planning and comparison.
Disclaimer
The calculations provided by this website are for informational purposes only and should not be considered financial, legal, tax, or professional advice.
Frequently Asked Questions
What is a z-score?
A z-score tells how many standard deviations a value is from the mean. Z = (x - μ) / σ. A z-score of +1 means the value is 1 SD above average.