Z-Score Calculator Formula Guide

It means the value is above the mean by that many standard deviations.

It is an approximation based on the standard normal distribution.

For the Z-Score Calculator, it uses the Z-score: z = (value - mean) / standard deviation. A value of 85 with mean 70 and SD 10 has z = 1.5.

For the Z-Score Calculator, enter mean. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.

Z-Score Calculator calculates the selected statistic from the sample values provided. It uses the Z-score, but missing data, outliers, sample bias, and distribution assumptions can affect what the result means.

For the Z-Score Calculator, check mean, sample definition, missing values, outliers, and rounding precision. A statistic can be numerically correct but still describe a weak sample.