Probability Calculator (Independent Events)
Calculate joint probability of two independent events both occurring.
Formula and method
This calculator computes P(A and B), P(A or B) directly in your browser without sending data to an external server.
Mathematical formula
- P(A and B):
(p1 ÷ 100) × (p2 ÷ 100) × 100 - P(A or B):
((p1 ÷ 100)+(p2 ÷ 100)-(p1 ÷ 100) × (p2 ÷ 100)) × 100
Variables and parameters
- Probability of event A (p1): default value 50 %.
- Probability of event B (p2): default value 30 %.
Some formulas are undefined for certain input combinations (such as division by zero or logarithms of non-positive numbers). In those cases the live tool displays an alert instead of NaN.
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on SpecWhale.
Frequently asked questions
What equation and variables does Probability Calculator (Independent Events) use?
Probability Calculator (Independent Events) evaluates outputs such as <strong>P(A and B), P(A or B)</strong> based on inputs including Probability of event A, Probability of event B. Check the Mathematical Method section for the explicit formula.
What happens if I enter invalid or zero values into Probability Calculator (Independent Events)?
If an input combination is mathematically undefined (such as division by zero or negative square roots), SpecWhale alerts you gracefully rather than returning invalid NaN outputs.
Are my calculations in Probability Calculator (Independent Events) saved or private?
All calculations are 100% private and run locally in your Web browser. Your numbers are never uploaded to any server, but can be saved locally to your device or exported as CSV/JSON.
Is Probability Calculator (Independent Events) free to use?
Yes. Probability Calculator (Independent Events) is completely free, has no usage limit, and does not require an account, email, or API key.
Does Probability Calculator (Independent Events) store or upload my data?
No. Probability Calculator (Independent Events) calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Probability Calculator (Independent Events)?
Probability Calculator (Independent Events) uses a standard formula (see the Method section above for the exact expression). For high-stakes financial, medical, or legal decisions, confirm the result with a professional or an authoritative source before relying on it.
Can I embed Probability Calculator (Independent Events) on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Probability Calculator (Independent Events) to your own blog post or page.