Z-Score CalculatorMath
Calculate the standard score (Z-score) to find how many standard deviations a value is from the mean.
Z-score
1
Within ±2σ
Capabilities & How-To Guide
Instructions, supported options, and client-side privacy guarantee.
Show GuideHide Guide
Capabilities & How-To Guide
Instructions, supported options, and client-side privacy guarantee.
Show GuideHide Guide
Standardized Scores
The Z-Score (or Standard Score) tells you how many standard deviations a data point is from the mean. It's a universal way to compare values across different datasets with different units.
Statistical Significance
Easily identify outliers. A Z-score greater than 2 or less than -2 is typically considered unusual, while a score of 0 indicates the value is exactly at the mean.
Interpretation Guide
Z = 0The value is exactly average
Z > 0The value is above average
Z < 0The value is below average
|Z| > 2Statistically unusual (Outlier)
Need an extra feature or found an edge case?Send Feedback
Related tools
Other utilities people use next.
Mean, Median, Mode Calc
MathCalculate the average, middle value, and most frequent number in a set of data.
Open tool
Standard Deviation Calc
MathCalculate the standard deviation and variance for a set of numbers.
Open tool
Variance Calculator
MathCalculate the variance of a dataset to understand the spread of your numbers.
Open tool