Statistical Calculator

Z-Score Calculator

Find the standard score of an observation and see how far it is from the mean in standard-deviation units.

How to interpret a z-score

A z-score expresses the distance between an observation and the mean in standard-deviation units. Positive scores are above the mean, negative scores are below the mean, and a score of zero is exactly at the mean.

z = 0

The observation equals the mean.

Positive z

The observation is above the mean.

Negative z

The observation is below the mean.

Use statistics as part of a complete research process

Statistical calculations are most useful when connected to an appropriate research design, sampling strategy, measurement approach, and analysis plan.

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