Math & Science
Z-Score Calculator
Calculate z-score and probability
Created and maintained by: CalcTago Editorial TeamLast updated: 2026-02-13
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
Region
Loading calculator...
Frequently asked questions
What does the Z-Score Calculator do?
It helps you calculate z-score and probability.
What inputs do I need?
Enter Value, Mean, and Std. deviation.
Are decimals supported?
Yes, you can use decimal values where appropriate.
Related tools
About this tool
This Z-Score Calculator turns your inputs into practical results. Provide Value, Mean, and Std. deviation to calculate Z-score.
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.