Standard Deviation Z-Score Table
Look up cumulative probabilities for any z-score. See area to the left and right, plus common z-score references.
Z-Score
1.96
Cumulative Probability
98.0975%
Percentage of values below this z-score
Area to Left
0.98
Area to Right
0.02
Common Z-Scores Reference
z = 1.645 → 90% confidence z = 1.960 → 95% confidence z = 2.326 → 99% confidence z = 2.576 → 99.5% confidence z = 3.090 → 99.9% confidence