Dice Probability Calculator: Instantly Find Your Roll Odds & Sums

Calculate Your Dice Roll Probabilities

The total number of dice you are rolling (e.g., 2 for 2d6).
The number of faces on each die (e.g., 4, 6, 8, 10, 12, 20).
The exact total value you want to achieve across all dice. Leave empty to skip sum probability calculation.
A specific number you want to roll on at least one of your dice. Leave empty to skip.

Unlock the secrets of your dice rolls! Our Dice Probability Calculator instantly determines the odds for any number of dice and sides, whether you're aiming for a specific sum (e.g., a 7 with 2d6) or rolling at least one target number (e.g., a 6 with 3d6). Perfect for D&D, board games, or understanding chance.

Formula:

For Specific Sum Probability:

  • P(Sum = S) = (Number of ways to roll sum S) / (Total possible outcomes)
  • Total possible outcomes = (Number of Sides)Number of Dice

For At Least One Target Face Probability:

  • P(At Least One Target Face) = 1 - P(No Target Face on Any Die)
  • P(No Target Face on Any Die) = ((Number of Sides - 1) / Number of Sides)Number of Dice

Where:

  • Number of Dice (N): The total number of dice being rolled.
  • Number of Sides (S): The number of faces on each die (e.g., 6 for a standard d6).
  • Target Sum: The specific total value you want to achieve across all dice.
  • Target Face Value: A specific number on a die face you want to see at least once.

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