Dice Probability Calculator
Calculate the probability of rolling a specific sum with multiple dice of any type.
How to Use the Dice Probability Calculator
- Enter the number of dice you are rolling.
- Select the type of dice (d4, d6, d8, d10, d12, or d20).
- Enter the target sum you want to achieve.
- Click Calculate to see the probability, odds, and expected value.
使用例
- •Tabletop RPG players calculating attack or skill check odds.
- •Board game designers balancing game mechanics.
- •Statistics education with physical probability examples.
- •Comparing odds across different dice configurations.
計算式
Total outcomes = Sides^Dice. Ways to reach target sum calculated by dynamic programming. Probability = Ways / Total outcomes.
よくある質問
What is the most likely sum for 2d6?
The most likely sum is 7, with a probability of 6/36 ≈ 16.7%.
What does expected value mean?
Expected value is the average sum you would get over many rolls: (Sides + 1) / 2 × Number of dice.
Is it free?
Yes, all calculators on OhMyCalc are completely free.