About the Dice Probability Calculator
Probability of rolling an exact sum, at least or at most a total with any number of dice and sides (d6, d20…).
Also known as: dice roll probability, dice odds, probability of rolling, 2d6 probability, d20 probability.
How to use this calculator
- Enter number of dice, sides per die, target sum, probability of.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
P = favourable outcomes / sidesⁿ
Worked example
Using the values pre-filled in the calculator above:
- Number of dice = 2
- Sides per die = 6
- Target sum = 7
- Probability of: Exactly
the calculator returns:
- Probability: 0.16666667
- As a percentage: 16.6667%
- Odds (1 in …): 1 in 6
- Favourable outcomes: 6 of 36