Z-score calculator
Standaardiseer een waarde en bepaal het percentiel.
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Inleiding
Z-Score Calculator — Standardize a value and get its percentile. Enter Value (x), Mean (μ), Std. deviation (σ) to get an instant, accurate result.
Formule
z = (x − mean) / standard deviation. Percentile derived from the standard normal cumulative distribution function.
Stap voor stap
- Enter the Value (x).
- Enter the Mean (μ).
- Enter the Std. deviation (σ).
- Click Calculate to see your result instantly.
Praktijkvoorbeeld
Example: With Value (x) = 85, Mean (μ) = 75, Std. deviation (σ) = 10, the Z-Score Calculator gives Z: 1, Percentile: 84.1345.
Veelgestelde Vragen
What does a z-score of 0 mean?
The value is exactly equal to the mean.
What does the percentile tell me?
The percentage of the distribution that falls below your value, assuming a normal distribution.
What inputs does the Z-Score Calculator need?
You'll need to provide: Value (x), Mean (μ), Std. deviation (σ). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Z-Score Calculator?
The Z-Score Calculator applies the formula exactly as calculated — z = (x − mean) / standard deviation. Percentile derived from the standard normal cumulative distribution function. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Z-Score Calculator free to use?
Yes, the Z-Score Calculator is completely free, requires no signup, and runs instantly in your browser.
Over Z-score calculator
The Z-Score Calculator uses a real, verifiable formula — z = (x − mean) / standard deviation. Percentile derived from the standard normal cumulative distribution function. — so results are accurate every time, not an approximation.