Z-Score Calculator
STATISTICS & ALGEBRA
Z-Score Calculator
Express a value in standard-deviation units.
UNDERSTAND YOUR RESULT
How it works
Express a value in standard-deviation units.
THE CALCULATION(value − mean) / standard deviation
Using this calculator
Enter observed value, mean, standard deviation. (value − mean) / standard deviation.
What to keep in mind
Calculations use finite real numbers. Intermediate values are unrounded; very large or undefined results are rejected.
Frequently asked questions
Are my entries saved?
No. Calculator inputs remain in the current page and are cleared when you reload or leave. The tools do not upload your entries.
Why are results rounded?
The display is rounded for readability. Calculations use unrounded intermediate values. An estimate should not be interpreted as an exact measurement.