Z-Score Table Lookup | Normal Distribution Probability

Look up Z-score probabilities or calculate Z-scores from raw values. View cumulative probability, left and right tail areas, percentile rank, and common Z-score reference table.

Cumulative Probability P(Z ≤ z)

0.975002

z = 1.96

Left Tail P(Z ≤ z)

97.5002%

Right Tail P(Z > z)

2.4998%

Two-Tailed P(|Z| > |z|)

4.9996%

Between ±|z|

95.0004%

Percentile

97.50th percentile

Common Z-Scores

z = -3.00 → P(Z ≤ z) = 0.001350

z = -2.50 → P(Z ≤ z) = 0.006210

z = -2.00 → P(Z ≤ z) = 0.022750

z = -1.96 → P(Z ≤ z) = 0.024998

z = -1.50 → P(Z ≤ z) = 0.066807

z = -1.00 → P(Z ≤ z) = 0.158655

z = -0.50 → P(Z ≤ z) = 0.308538

z = 0.00 → P(Z ≤ z) = 0.500000

z = 0.50 → P(Z ≤ z) = 0.691462

z = 1.00 → P(Z ≤ z) = 0.841345

z = 1.50 → P(Z ≤ z) = 0.933193

z = 1.96 → P(Z ≤ z) = 0.975002

z = 2.00 → P(Z ≤ z) = 0.977250

z = 2.50 → P(Z ≤ z) = 0.993790

z = 3.00 → P(Z ≤ z) = 0.998650

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