This calculator finds the standardized z-score for any raw value of X, a population mean, and a population standard deviation.

A z-score simply tells us how many standard deviations away from the mean a value X lies.

To find the z-score for any value of X, simply fill in the boxes below and then click the “Calculate” button.

Raw score (X)

Population mean (μ)

Population standard deviation (σ)

Z score: (X – μ) / σ

Z score: (17 – 13.5) / 4 = 0.875