Dice Roller
Pick your dice, roll as many as you like, add a modifier. Built for tabletop, works for anything.
Roll a d6 to see the result.
Rolling more than one die
Set the number of dice and they are all rolled together and totalled. A modifier is added to the total once, not to each die, which matches how tabletop notation works: 2d6+3 means roll two six-sided dice, add them, then add three.
Adding dice changes the odds in a way people miss
A single die is flat - every face equally likely. Two dice added together are not. There are six different ways to make 7 with two six-sided dice and only one way to make 2, so 7 comes up roughly six times as often as snake eyes.
This is the single most useful thing to understand about dice, and it explains a lot of game design. It is why Settlers of Catan puts its highest-value numbers on 6 and 8, why the orange properties in Monopoly get landed on so often, and why rolling 3d6 for an ability score gives you an 18 about once in 216 rolls rather than one in six.
Virtual dice versus physical ones
Real dice are not perfectly fair. Cheap moulded dice have air bubbles and uneven pip depth - hollowing out six pips on one face makes it very slightly lighter than the face with one. Casino dice are machined to tolerances of a few thousandths of an inch and have flush, filled pips precisely because those small asymmetries add up over thousands of rolls.
A virtual roll has none of that. Each face is drawn from your browser's cryptographic random number generator with rejection sampling, so all faces are exactly equally likely with no rounding bias. And each roll produces a receipt, which is occasionally useful when someone rolls a critical at a suspiciously convenient moment. How the receipts work.
Common rolls
- d20 - attack rolls, saving throws and skill checks in most roleplaying systems
- 2d6 - Monopoly, Backgammon, Catan and most family board games
- 3d6 - the classic ability-score roll, giving 3 to 18 on a curve
- d100 - percentile rolls for loot tables and roll-under systems
If you just need a number in a range rather than dice, the random number generator is a better fit.
Single dice
- Roll a d4The four-sided die. Smallest of the standard polyhedral set.
- Roll a d6The ordinary cube. Every board game in the cupboard uses one.
- Roll a d8Eight faces, 12.5% each. Common for medium weapon damage.
- Roll a d10Ten faces. Used alone, or in pairs to make percentages.
- Roll a d12Twelve faces. The most under-used die in the set.
- Roll a d20The one that decides whether you hit. 5% per face.
- Roll a d100Percentile. One number in a hundred, flat odds throughout.
- Roll 2d6Two ordinary dice, totalled. The shape of most board games.
- Roll 3d6Three dice, totalled. The classic ability-score roll.
- Roll 2d10Two ten-sided dice, totalled. Range of 2 to 20 on a curve.