How to use this calculator

For independent events, one event does not change the probability of the other.

The method

P(A and B) = P(A) × P(B) for independent events

Enter your values in the labeled fields and choose Calculate. The result panel shows the answer and supporting values when useful.

WORKED EXAMPLE INPUT

P(A): 0.4, P(B): 0.3

Select Calculate to evaluate these example values.

Scope and limitations

Do not use this multiplication rule for dependent events unless the appropriate conditional probability is used.

Common questions

Can I use different units?

Use consistent units unless this page is a unit converter. The result follows the units implied by the inputs.

Are results exact?

Displayed values may be rounded. Keep extra precision for important follow-up calculations.

Methods & verification

Formulas use standard mathematical definitions and fixed unit factors where applicable. See our methodology for numerical conventions, rounding, privacy, and limitations.