A LITTLE CONTEXT
How to use z-score calculator
- Enter or edit the example values in the input panel.
- Review the method below and choose the options that match your task.
- Run the tool, check the result, and copy or download it. Reset restores the example; Clear removes your input and result.
Method & assumptions
z = (x − μ) / σ; σ > 0.
A z-score describes distance from a supplied population mean in standard deviations. This tool does not estimate a p-value or assume a normal distribution.
Result units: Standard score (dimensionless)
Worked example
- Observed value
- 85
- Population mean
- 70
- Population standard deviation
- 10
1.5