Z-Score Calculator
Calculate the z-score of a value in a normal distribution.
Result
Results are estimates for general information only and are not professional advice.
Z-scores
A z-score tells you how many standard deviations a value is from the mean: z = (x − μ) ÷ σ. It is used to compare values from different distributions and to find probabilities in statistics.
Frequently Asked Questions
What is the Z-Score Calculator?
Calculate the z-score of a value in a normal distribution. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the Z-Score Calculator?
The Z-Score Calculator asks for the following values (3): Value (x), Mean (μ), Standard deviation (σ). Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Z-Score Calculator?
The Z-Score Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Z-Score Calculator free, and do I need an account?
Yes. The Z-Score Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.