Z‑Score Probability Visualizer

Enter raw scores, mean, and standard deviation to see shaded areas under the normal curve. Choose “Less than”, “More than”, or “Between”. Results are shown to 4 decimals and as a percentage.

Single value (less than / more than)

Example: score 72, mean 70, sd 2 → z = 1, P(X<72)=0.8413

Between two values

Example: 66 to 74 with mean 70, sd 2 → z = −2 and 2, P = 0.9545

All math uses the standard normal CDF.