Which notation does the box accept?

Terms of the form NdS joined by plus or minus signs, with flat modifiers allowed: 3d6, 3d6+2, 2d20-1 and 2d6+1d8+3 all parse, and dropping N rolls one die, so d20 means 1d20. Keep-highest and exploding syntax such as 4d6kh3 is not supported, it is rejected with a message, and the Roll button stays disabled until the notation is valid.

Do coin flips count towards the statistics?

No. The session statistics ignore them, since a coin flip has no face value to add.

Does it work without a connection?

Yes. The generator is part of the browser, so no request is made once the page has loaded.

Dice Roller

No upload · runs in your browser

Dice notation

Quick roll

Faces are drawn from your own device’s cryptographic generator, nothing is uploaded.

How it works

Dice Roller for 3d6+2 Notation and Quick d20 Rolls

Roll anything from a single d20 to 2d6+1d8+3. Every individual die face is shown alongside the total, with a history and running total for the session.

What this does

Notation with as many terms as you need, including negative ones like 2d20-1
Quick buttons for d4 through d100, plus a coin flip
Every individual face listed, with a natural maximum picked out in colour
Roll history holding the last 60 rolls, clearable in one press
Session stats for rolls, running total, dice thrown and average roll
Limits of 200 dice per term and d1000, reported as an error rather than silently capped
Faces drawn from crypto.getRandomValues with the biased tail rejected

FAQ

Each face comes from crypto.getRandomValues rather than Math.random. A 32-bit draw does not divide evenly into most die sizes, so the values in the unusable top of the range, the ones that would make low faces slightly more likely, are thrown away and redrawn instead of being folded back down. That removes the modulo bias, and no seed carries between rolls for an earlier result to give away. On a d20 the bias it eliminates is tiny; the reason to do it is that there is no cost to doing it properly.

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