๐ Statistics
Z-Score Calculator
A z-score says how many standard deviations a value sits from the mean. Converting to z-scores is what lets you compare measurements from completely different distributions on the same scale.
How it works
Value
Mean
Standard deviation
Z-score
Percentile rank
Deviation from mean
Probability above this value
Frequently asked questions
How do I use the Z-Score Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.