Z-score Calculator

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Calculates how many standard deviations a data point is from the mean of its distribution.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Data Point Value, Population Mean, and Population Standard Deviation in the units shown.

Step 2

Read Z-score in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Data Point Value: 80; Population Mean: 50; Population Standard Deviation: 10

Z-score: 3

Data Point Value: 40; Population Mean: 50; Population Standard Deviation: 10

Z-score: -1

Data Point Value: 60; Population Mean: 50; Population Standard Deviation: 5

Z-score: 2

Explore the topic

Use calculators for algebra, geometry, trigonometry, probability, statistics, averages, z-scores, tests, and graphing tasks.

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