Independent Events Calculator

Calculate probability of multiple independent events.

Fill in the fields below to calculate

P(A)

P(B)

Enter your values above to see the result.

Your Results

P(A and B)

P(A or B)

P(Neither)

P(not A)

P(not B)

Formulas

Joint Probability:

P(A and B) = P(A) × P(B)

Union Probability:

P(A or B) = P(A) + P(B) - P(A) × P(B)

Complement:

P(not A) = 1 - P(A)

These formulas apply only to independent events.

Pro Tips

Results update as you type — change any field to see the effect immediately.

Check that every value uses the same unit before comparing results.

Use the copy button to paste the independent events figures into a note or spreadsheet.

Nothing is sent to a server, so you can use this with private figures.