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Z-Score to Probability Converter
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Conversion Options
Conversion Type
Z-Score to Probability
Probability to Z-Score
Distribution Area
Left-tailed (P(Z ≤ z))
Right-tailed (P(Z ≥ z))
Two-tailed (P(|Z| ≥ z))
Between two Z-scores
Decimal Precision
Use Custom Mean and SD
Population Mean (μ)
Population SD (σ)
Show Step-by-Step Calculation
Reset All Fields
Common Z-Scores
z = 0.00 (50%)
z = 0.67 (75%)
z = 0.84 (80%)
z = 1.28 (90%)
z = 1.64 (95%)
z = 1.96 (97.5%)
z = 2.33 (99%)
z = 2.58 (99.5%)
z = 3.09 (99.9%)
Z-Score Calculator
Z-Score Value
z =
Valid range: -4 to 4
Lower Z-Score
z₁ =
Upper Z-Score
z₂ =
Probability Value
p =
Valid range: 0 to 1
Calculate
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Results
Calculation Result
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Step-by-Step Calculation
Normal Distribution Visualization
Conversion History
Time
Conversion Type
Input
Output
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