Probability Calculator - Calculate Chances and Statistics

Calculate probabilities of simple and compound events. Ideal for students, statisticians, and professionals working with risk analysis and decision-making.

What is probability?

Probability is the measure of the chance of an event occurring, expressed as a number between 0 (impossible) and 1 (certain), or between 0% and 100%. It is fundamental for risk analysis and decision-making.

Types of probability

The calculator works with simple probability (one event), conditional probability (given that another event has occurred), independent events, and mutually exclusive events.

Addition rule

For mutually exclusive events (cannot occur simultaneously), the probability of A or B is P(A) + P(B). Our calculator applies these rules automatically.

Multiplication rule

For independent events (one does not affect the other), the probability of A and B occurring together is P(A) × P(B). Essential for compound probability calculations.

Practical Applications

Use for business risk analysis, games and betting, quality control, statistical forecasting, medical decisions, and strategic planning.

Conditional Probability

Calculate the probability of an event given that another has already occurred. Fundamental for Bayesian analysis and updating beliefs based on new information.

Interpretation of Results

A probability of 0.8 (80%) means that, under similar conditions, the event would occur approximately 80% of the time. It does not guarantee that it will occur, but indicates a high chance.

Conclusion

Calculate probabilities with mathematical precision using our free tool. Essential for statistical analysis, decision-making, and risk management.