Z-Score Calculator
Calculate the z-score (standard score) from a value, mean and standard deviation. Find percentile ranking.
How to Use This Z-Score Calculator
- 1Enter the data value (X)
- 2Enter the population mean (μ)
- 3Enter the standard deviation (σ)
- 4Click Calculate to see the z-score and percentile
Formula
Z = (X − μ) / σ where X = value, μ = mean, σ = standard deviation
Frequently Asked Questions
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About Z-Score Calculator
The z-score calculator converts a raw score into a standardized score showing how many standard deviations it is from the mean. Useful for statistics, grading curves and data analysis.