免费概率计算器
计算事件发生的概率，支持简单概率和组合概率。
Probability
0.300000
Probability Pct30.00%
Odds For0.4286
Odds Against2.3333
公式
## How to Calculate Probability ### Formula **P(event) = Favorable Outcomes / Total Outcomes** Probability ranges from 0 (impossible) to 1 (certain). ### Odds - **Odds in favor** = favorable / unfavorable - **Odds against** = unfavorable / favorable
计算示例
A bag has 10 marbles: 3 red, 7 blue. What is the probability of drawing a red marble?
- 01P(red) = 3 / 10 = 0.3
- 02As a percentage: 30%
- 03Odds in favor: 3 / 7 ≈ 0.4286
- 04Odds against: 7 / 3 ≈ 2.3333
常见问题
What is probability?
Probability is a measure of how likely an event is to occur. It is calculated as the number of favorable outcomes divided by the total number of possible outcomes.
What is the difference between probability and odds?
Probability is favorable/total (ranges 0 to 1). Odds are favorable/unfavorable (can be any positive number). Probability of 0.75 means odds of 3:1 in favor.
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