Z-Score Calculator
The z-score of x is (x minus the mean) divided by the standard deviation.
A z-score says how many standard deviations a value sits from the mean.
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Example problems
How this solver works
- Parse x, mean, and sd.
- Divide the signed deviation by sd.
Formula
Standard score.
Worked examples
12, 10, 2
- (12-10)/2 = 1
Answer: 1
Common mistakes
Swapping x and μ
Subtract the mean from the data value, not the other way around, unless you want the opposite sign.
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Frequently asked questions
What does z = 0 mean?
The value equals the mean.