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Dice Probability Calculator

Roll dice notation like 3d6+2 and see the full probability distribution.

Dice notation like 3d6+2 means roll three six-sided dice and add two. This calculator computes the exact probability of every possible total by convolution rather than simulation, so the figures are precise — and shows the cumulative "at least" probability that matters for target numbers.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why is 3d6 not evenly distributed?

Because there are many more ways to roll a 10 or 11 than a 3 or 18. A total of 3 requires all three dice to show 1 — exactly one combination out of 216 — while 10 can be reached 27 different ways.

How to use the dice probability calculator

  1. 1Enter or paste your dice notation.
  2. 2Set the simulated rolls.
  3. 3Enter or paste your seed.
  4. 4The result appears immediately — copy or download it.

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Put the working dice probability calculator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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