Statistics & Probability
Z-Score Calculator
Lets users solve and check z-score instantly with formula, steps and examples — no manual math.
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Your result
Z-score
1.5
z = (85 − 70) / 10 = 1.500 (≈ 93.3th percentile)
Percentile
93.32%
About this calculator
A z-score measures how many standard deviations a value sits from the mean: z = (x − μ)/σ. A z of +1.5 means 1.5 SD above average, roughly the 93rd percentile.
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