How to use the dice roller
- Enter the number of dice to roll, from 1 to 20.
- Pick a die: d4, d6, d8, d10, d12, d20, d100, or Custom for any die from 2 to 1,000 sides.
- Optionally enter a modifier from −100 to 100, such as +3 for a bonus or −2 for a penalty.
- Press Roll. The result shows every die, their sum and the total with the modifier. The Details card keeps your last 10 rolls.
Dice notation
Games write rolls as NdS + M: N dice with S sides each, plus a modifier M. For example, 3d6 + 2 means roll three six-sided dice, add them up and add 2. The total of 3d6 + 2 can be anything from 5 (three 1s plus 2) to 20 (three 6s plus 2).
Worked example
You roll 3d6 + 2 and the dice show 1, 6 and 4:
- Sum of dice: 1 + 6 + 4 = 11
- Total: 11 + 2 = 13
How the rolls are made fair
Each die uses your browser's cryptographically secure random number generator, the same kind of randomness used for passwords and encryption keys. A simple remainder trick on a random number would make some faces very slightly more likely than others. To avoid that, the roller throws away the rare random values that would cause such a bias and draws again, so every face of every die has exactly the same chance.
Good to know
- Every roll is independent. A die does not remember earlier results, so a run of low numbers does not make a high number more likely next time.
- Rolling more dice makes totals cluster around the middle. One d6 is equally likely to show any number, but the sum of 3d6 lands on 10 or 11 far more often than on 3 or 18.
- A d100 gives a whole number from 1 to 100, which is handy for percentage tables in games.
- Your roll history is kept only on the page in your browser. It is not saved or sent anywhere and disappears when you reload or leave the page.