Probability Calculator
Probability modes with independence assumptions stated for AND/OR rules.
Limitation: Educational probability.
How to Use the Probability Calculator
Probability modes with independence assumptions stated for AND/OR rules.
Open the Probability calculator and read field labels.
Match the mode
Educational probability.
What It Calculates
Probability modes with independence assumptions stated for AND/OR rules.
Worked Examples
Independent AND
Inputs
Result
0.4 × 0.5.
Complement
Inputs
Result
1 − 0.35.
Conditional
Inputs
Result
0.12/0.3.
Check your mode
Educational probability.
Frequently Asked Questions
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Standard definitions with assumptions noted below.
Formula
Scientific Background
Standard statistics definitions with assumptions stated on-page. Educational only—not professional certification.
Sources & review
Probability Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.
Last reviewed
July 22, 2026
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