Z-score Calculator
Z-score equals value minus mean divided by standard deviation.
This calculator is free to use. Enable JavaScript to enter your values and see a result instantly.
How it works
Z-score equals value minus mean divided by standard deviation.
Worked example
85 with mean 70 and standard deviation 10 has a z-score of 1.5.
Keep in mind
Results are estimates; check the assumptions for your situation.