Education & Math Tools
Z-Score Calculator
Enter a value, mean, and standard deviation to calculate the z-score and approximate percentile.
z = 1.000
Standard score
84.1th percentile
Approximate, assuming a normal distribution
How to use this tool
- 1Enter the value, mean, and standard deviation.
- 2See the calculated z-score and percentile.
Frequently asked questions
What does a z-score tell you?+
It shows how many standard deviations a value is from the mean — useful for comparing values across different normal distributions.