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01
Descriptive
02
Normal
03
Confidence interval
04
Sample size
05
t-test
06
Chi-square
07
Correlation
08
Probability
Normal distribution probability calculator (z-score ↔ cumulative probability)
A
Input
Mean μ
Standard deviation σ
Probability to compute
P(X ≤ x)
P(X ≥ x)
P(a ≤ X ≤ b)
Outside a–b
Inverse (p → x)
x
a (lower)
b (upper)
Probability p (0–1)
Tail
Left P(X ≤ x) = p
Right P(X ≥ x) = p
Central area = p
R
Result
Enter data and results appear instantly.
Copy results
Related:
Normal Distribution and z-Scores: Cumulative Probability and Top-x% Cutoffs
Standard normal table (z table)