Z Score Table Lookup Calculator
Look up the standard normal cumulative probability and tail areas for any z-score.
Compare Your Options And Get Clear Answers
Look up the standard normal cumulative probability and tail areas for any z-score.
Z Score Table Lookup Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
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Read the breakdown and the explanation.
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Z Quick Guide
Typical values for reference.
| z | P(Z<=z) | P(Z>=z) | Two-tailed |
|---|---|---|---|
| -2.58 | 0.0049 | 0.9951 | 0.0099 |
| -1.96 | 0.0250 | 0.9750 | 0.0500 |
| -1.64 | 0.0505 | 0.9495 | 0.1010 |
| 0 | 0.5000 | 0.5000 | 1.0000 |
| 1 | 0.8413 | 0.1587 | 0.3173 |
| 1.64 | 0.9495 | 0.0505 | 0.1010 |
| 1.96 | 0.9750 | 0.0250 | 0.0500 |
| 2.58 | 0.9951 | 0.0049 | 0.0099 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Z Score Table Calculator FAQ
Answers to common questions about this calculator.
Find the row and column for the z-score, the value is the area to the left.
About 1.96 (two-tailed).
Cumulative probability from the standard normal distribution.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.