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Students and analysts computing probabilities.
Using the probability calculator without installing anything or signing up.
Capture probability-calculator intent with a fast, browser-side tool that runs 100% locally.
Cleanor Labs
These sections explain the job in plain language and set expectations for what the tool should do well.
This probability calculator handles the two questions people ask most. First, it turns a count of favorable outcomes over total outcomes into a probability, a percentage and the odds against. Second, it combines two events: enter P(A) and P(B) as decimals or percentages and it returns P(A and B), P(A or B) and each complement. Events are treated as independent unless you supply P(A and B) yourself, in which case it also computes the conditional probabilities P(A given B) and P(B given A). Everything is calculated in your browser and updates as you type.
Short answers for the questions people usually have before trying a utility like this.
Type a decimal between 0 and 1, such as 0.25, or a percentage such as 25%. The calculator accepts either format for P(A) and P(B).
Yes, by default. P(A and B) is computed as P(A) times P(B). If your events are not independent, enter the known P(A and B) and the tool will use that value for P(A or B) and the conditional probabilities.
No. All calculations run locally in your browser and nothing is uploaded.
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Work out a single-event probability from favorable and total outcomes, then combine two events. Everything updates live in your browser.
Enter probabilities as a decimal (0.25) or a percentage (25%). Combined values assume the two events are independent unless you supply P(A and B).
Calculated locally in your browser.