Use this Probability Calculator to calculate the chance of an event happening. Find basic probability, complementary probability, combined events, conditional probability, and binomial probability with clear formulas and step-by-step results.
Calculate basic probability, complementary events, combined events, conditional probability, and binomial probability with instant results and step-by-step explanations.
Probability Inputs
Results update automatically as you change your inputs.
Calculation Results
Probability is expressed as a percentage, decimal, and approximate fraction. Binomial calculations assume independent trials with the same probability of success on each trial.
How to Calculate Probability
Probability tells you how likely an event is to happen. Enter the required values, choose a probability type, and the calculator will show your result automatically.
Examples:
- Rolling a die: The probability of rolling a 3 is 1/6, or about 16.67%.
- Flipping a coin: The probability of getting heads is 1/2, or 50%.
- Drawing a red card: From a standard 52-card deck, the probability is 26/52, or 50%.
Probability values range from 0 (impossible) to 1 (certain). You can express them as fractions, decimals, or percentages.
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