Z Score Calculator
z = (x − μ) / σ.
Inputs and units
- Observed value: Enter your value in the format and unit shown.
- Population mean: Enter your value in the format and unit shown.
- Population standard deviation: Enter your value in the format and unit shown.
Calculation method
z = (x − μ) / σ.
Worked example
The example values are: Observed value = 85; Population mean = 70; Population standard deviation = 10
- Z score: 1.5
Assumptions and limitations
Check that the inputs and units describe your situation.
Using your result
Select Calculate after changing inputs. Copy result copies the displayed output; Download result saves a text file. Reset returns the form to its example inputs. Calculations run in your browser.
Z Score Calculator FAQs
What method does this calculator use?
z = (x − μ) / σ.
What should I check before using the result?
Check that the inputs and units describe your situation.