Z-score Calculator

Calculate Z-scores, convert between Z-scores and probabilities, and find probabilities between two Z-scores

Use this calculator to compute the z-score of a normal distribution.

Raw Score, x

Population Mean, μ

Standard Deviation, σ

Please provide any one value to convert between z-score and probability. This is the equivalent of referencing a z-table.

Z-score, Z

Probability, P(x < Z)

Probability, P(x > Z)

Probability, P(0 to Z or Z to 0)

Probability, P(-Z < x < Z)

Probability, P(x < -Z or x > Z)

Use this calculator to find the probability (area P in the diagram) between two z-scores.

Left Bound, Z₁

Right Bound, Z₂