Z-Score Calculator

Calculate z-scores and percentiles from a normal distribution, or find a value from a z-score.

Mean (μ)

Std Dev (σ)

Value (x)

Z-Score1.0000

Percentile84.13%

Formula(75 − 70) / 5 = 1.0000

Between 1–1.645 SD — fairly typical

Z-Score Reference Table

z = -30.13th percentile

z = -2.50.62th percentile

z = -22.28th percentile

z = -1.6455.00th percentile

z = -1.56.68th percentile

z = -115.87th percentile

z = -0.530.85th percentile

z = 050.00th percentile

z = +0.569.15th percentile

z = +184.13th percentile

z = +1.593.32th percentile

z = +1.64595.00th percentile

z = +297.72th percentile

z = +2.599.38th percentile

z = +399.87th percentile