Z-Score Calculator

How to Calculate Z-Score

Calculating z-score can be done with the following variables:

1. Data point


2. Mean


3. Standard Deviation

• ZS = Z-score


• DP = Data point


• M = Mean


• SD = Standard deviation

Understanding Your Results

Your z-score will be a single number. This number may not be a whole number but can be sometimes. This number represents how many standard deviations the data point is from the mean. If the data point is less than the mean the z-score will be a negative number. Inversely, if the data point is greater than the mean it will be a positive result. The closer the z-score is to zero, the closer the data point is to the mean.

How to Use the Z-Score Tool

If you are trying to easily find the z-score value of something than you are in the right place. Calculating z-score with this tool is very simple. The steps involved with using this tool include:

1. Enter the data point.


2. Enter the mean of the data set.


3. Enter the standard deviation.


4. Hit the calculate button and instantly get your z-score result

Calculation Example

Let's say we just got out grade back on our midterm and we want to have a better understanding of how we did. We want to see how closely we aligned with the middle of the pack of grades. We can use this tool to find the z-score to help us understand this more. We got a 90 on the test. The mean score was 85 and the standard deviation is 15. We can enter these numbers into this tool and hit calculate to get our z-score. When we do we get a z-score result of .33, meaning we are about a third of a standard deviation from the mean score.