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Z-score calculator

ET · Free tools

Z-score calculator

Calculate a standardized score from a value and an entered mean and standard deviation.

Your entries are processed locally. Reference guidance.

How to use this tool

Enter the observation, mean and a positive standard deviation. The output shows signed distance from the mean in standard-deviation units.

What the result covers

A z-score alone does not establish a probability, percentile, statistical significance or normal distribution. No distribution inference is made.

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