Z-Score-Rechner
Rohwerte in Z-Score und Perzentil umrechnen
Your Data
Schnellbeispiele
Common Z-Score Reference
Results
Assumes an approximately normal distribution
So haben wir gerechnet
Z-Score
Was wäre wenn?
Jede Zeile wird mit Ihren aktuellen Eingaben neu berechnet. Tippen Sie auf eine Zeile, um sie anzuwenden.
Zwei Varianten vergleichen
Enter score, mean, and deviation
Fill in your raw score, the mean, and the standard deviation above
Z-Score Calculator FAQ
What is a z-score?
A z-score (standard score) tells you how many standard deviations a raw score is away from the population mean. z = (x − μ) ÷ σ. A z of +1.5 means the score is 1.5 standard deviations above the mean; a negative z means below the mean.
How do I turn a z-score into a percentile?
The percentile is the area under the standard normal curve to the left of z, written Φ(z). For example Φ(1.5) ≈ 0.9332, so z = 1.5 is roughly the 93rd percentile. This calculator computes Φ(z) automatically.
What do I use for μ and σ?
Use the mean and standard deviation of the reference group you are comparing against — for example the class average and its standard deviation on an exam. If only a sample is available, the sample mean and sample standard deviation are commonly used as estimates.
Can a z-score be greater than 3 or less than −3?
Yes. Z-scores have no fixed bounds; ±3 just covers about 99.7% of a normal distribution. Very large |z| means the value is extreme relative to the reference group, or that the distribution is not close to normal.
Related Statistics Calculators
Altersrechner
Berechnen Sie Ihr genaues Alter in Jahren, Monaten, Tagen, Stunden und Minuten mit unserem präzisen Altersrechner
Datumsrechner
Datumsdifferenzen berechnen, Tage, Wochen, Monate und Jahre von jedem Datum addieren oder subtrahieren
Prozentrechner
Prozentsätze, prozentuale Zunahme, Abnahme und Prozent einer Zahl berechnen