How to Use Probability Calculator
The Probability Calculator supports several common probability tasks. Select the mode that matches your problem, then enter counts or event probabilities. The Probability Calculator accepts decimal probabilities and percentage-style inputs, then shows the result as both a decimal and a percent when appropriate.
Formula & Theory — Probability Calculator
The Probability Calculator uses these core formulas:
P(A) = favorable / total
P(A^c) = 1 - P(A)
P(A union B) = P(A) + P(B) - P(A and B)
P(A|B) = P(A and B) / P(B)
These formulas cover single events, complements, overlapping events, independent events, and conditional probability. The Probability Calculator keeps the steps visible for learning and checking.
Use Cases for Probability Calculator
Use the Probability Calculator for statistics classes, test prep, data analysis introductions, risk estimates, games of chance, and everyday likelihood questions. It is designed for quick practice and transparent arithmetic.