確率計算ツール
事象の確率を計算します。
How to Calculate Probability
Probability は計算されます by dividing the number of favorable outcomes by the total number of possible outcomes: P(event) = favorable outcomes / total outcomes.
For example, the probability of rolling a 6 on a fair die: P = 1/6 ≈ 0.1667 or 16.67%.
Probability values always range from 0 (impossible) to 1 (certain). You can express probability as a fraction, decimal, or percentage.
Understanding Odds vs Probability
Probability is favorable outcomes divided by total outcomes. Odds compare favorable to unfavorable outcomes.
If probability is 1/4 (25%), the odds in favor are 1:3 (one favorable vs three unfavorable). Odds against would be 3:1.
Sports betting typically uses odds format, while science and statistics use probability.
Types of Probability
Theoretical probability uses mathematical reasoning (e.g., coin flip = 50%). Experimental probability uses observed data from experiments. Subjective probability is based on personal judgment.
This calculator computes theoretical probability based on the number of favorable and total outcomes you provide.
よくある質問
とは the probability of flipping heads on a coin?
The probability is 1/2 or 50%. There is 1 favorable outcome (heads) out of 2 possible outcomes.
How do I convert probability to percentage?
Multiply the probability by 100. For example, P = 0.25 → 0.25 × 100 = 25%.
Can probability be greater than 1?
No. Probability ranges from 0 (impossible) to 1 (certain). If you get a value greater than 1, check that favorable outcomes don't exceed total outcomes.