wikiHow Z Score Calculator To calculate a z-score, follow these steps: 1. Determine the value you want to convert to a z-score. 2. Determine the mean and standard deviation of the population you are working with. 3. Subtract the mean from the value you want to convert. 4. Divide the result of step 3 by the standard deviation. The formula for calculating a z-score is: z = (x - μ) / σ Where: x is the value you want to convert to a z-score μ is the mean of the population you are working with σ is the standard deviation of the population you are working with For example, let's say you have a dataset of test scores with a mean of 75 and a standard deviation of 10. If a student scored 85 on the test, the z-score would be calculated as: z = (85 - 75) / 10 = 1 This indicates that the student's score is 1 standard deviation above the mean. Page