🎲Probability Calculator
Find the probability of two independent events.
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About this calculator
Free Probability Calculator — find P(A and B), P(A or B) and P(neither) for two independent events.
How to use
Enter your Probability of A, Probability of B above — the result updates instantly as you type or drag the sliders. It's free and needs no sign-up.
Frequently Asked Questions
What does the Probability Calculator do? ▼
Find the probability of two independent events.
How does the Probability Calculator work out the answer? ▼
The Probability Calculator applies the standard mathematical formula for this problem to the values you enter and returns the exact result instantly.
How do I use the Probability Calculator? ▼
Enter your values using the input fields or sliders. The result updates instantly — no submit button needed. All calculations run in your browser.
Can I use the Probability Calculator for homework or study? ▼
Absolutely. The Probability Calculator is a great way to check your work and understand the steps. Try solving the problem yourself first, then compare with the calculator.
Is the Probability Calculator free? ▼
Yes — completely free. No sign-up, no download, and no account required. Works in any browser.