Z-Score Calculator

    Calculate z-score from mean and std deviation

    Formula

    z = (x - μ) / σ

    Standardizes a value relative to the distribution mean.

    Examples

    x=85, μ=75, σ=10

    z = 1.0, ~84th percentile.

    Frequently Asked Questions

    About Z-Score

    Calculate z-score and approximate percentile.