Dice Roller

How to use the Dice Roller

1. Set the Number of dice (1–20) and the Type of die, from a four-sided d4 to a percentile d100.
2. Add a Modifier if your game calls for one, such as +3 or −1. Leave it at 0 for a plain roll.
3. Click Roll. Each die is shown with its own result, and the total includes the modifier.
4. Prefer shorthand? Type notation like 3d6+2 or d20 and click Roll it. The controls update to match.
5. Check the Roll history for earlier results, newest first.

How it works

Each die is rolled with your browser's cryptographic random number generator using rejection sampling, so every face has exactly the same chance, 1 in 6 for a d6, 1 in 20 for a d20, and so on. The tumbling animation is only decoration; results are decided before it starts.

Dice notation is a compact way to describe a roll: NdS+M means roll N dice with S sides each, add them up, then add the modifier M. If you leave out N, as in d20, one die is rolled. The tool shows the lowest possible total, the highest, and the average, which is N × (S + 1) ÷ 2 + M.

Worked example: 3d6+2 could total anywhere from 5 (three 1s plus 2) to 20 (three 6s plus 2). The average is 3 × 3.5 + 2 = 12.5. Totals near the middle are far more common than the extremes because many combinations add up to them, which is why 3d6 results bunch up around 10 and 11.

A d100 here is a single roll from 1 to 100. Tabletop players often roll it as two ten-sided dice (tens and ones); the odds are identical.

Frequently asked questions

Are these dice fair?
Yes. Every face is equally likely, and each roll is independent. The tool uses your browser's cryptographic random generator with an unbiased method rather than a simple formula that could favor some numbers.

What does 2d6+3 mean?
Roll two six-sided dice, add the two results, then add 3. So rolling a 4 and a 5 gives 4 + 5 + 3 = 12.

Can I roll dice of different types at once?
One roll uses one die type. For mixed rolls, such as a d20 and a d6, roll each separately; both appear in the history so you can add them.

Why are the six-sided dice drawn with dots?
Because that is how most people recognize a d6 at a glance. Other dice show the number, with a small label telling you the type.

Is my roll history kept?
Only while the page is open. Nothing is stored or uploaded; reloading the page starts fresh.