Dice Probability Calculator
Calculate exact dice distributions by bounded convolution, expected values and target probabilities.
Runs in your browser — nothing is uploaded| Sum | Exact outcome count | Probability |
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Exact BigInt outcome counts use sliding-window convolution. Limits: 30 dice, 100 sides, ±10,000 modifier. The chart groups large ranges into at most 180 labeled bins; table and JSON keep every exact sum.
How to use Dice Probability Calculator
- Set the local options or participant list.
- Use the live display or labeled controls to create results.
- Copy/export supported results or use full screen. Private names and data stay local.
Questions
How does Dice Probability Calculator work?
Parse d20, 2d6 or 3d8+2. Exact BigInt counts are convolved with a sliding window, without enumerating combinations. Results include expectation, min/max, the complete sum distribution and probabilities equal to, below or above the target. Decimal probabilities use normal floating-point rounding.
Where does my work go?
Processing stays on this device. No uploads, accounts, remote asset requests, personal information or private-result telemetry are needed.