Probability Calculator
Calculate the probability of any event occurring. Enter the total possible outcomes and favorable outcomes to see the probability as a decimal, percentage, and odds ratio.
Understanding Probability
Probability quantifies the likelihood of an event occurring. It is calculated as the ratio of favorable outcomes to total possible outcomes. The result is always between 0 (impossible) and 1 (certain).
The basic formula is: P(Event) = Favorable Outcomes ÷ Total Outcomes. For example, drawing an ace from a standard deck: 4 aces ÷ 52 cards = 0.077 or 7.7%.
Probability is fundamental to statistics, gambling, weather forecasting, risk assessment, and many scientific fields. Understanding it helps make better decisions under uncertainty.
How to Use This Calculator
- Enter the total number of possible outcomes
- Enter the number of favorable outcomes (outcomes you want)
- Click "Calculate Probability" to see the result
- View probability as decimal, percentage, and odds ratio