Dice Roller
Roll d6, d20, or a die with any number of sides you like. Every die is shown, not just the total — and the total is never as evenly spread as people expect.
How to use it
- Say how many dice and how many sides. The buttons cover the usual tabletop set; the box takes anything from 2 to 1000.
- Add a modifier if your game asks for one —
2d6+3means two six-sided dice plus three. - Drop the lowest is the character-building roll: four dice, throw away the worst, keep the rest.
Two dice are not one big die
One six-sided die is even: each face has the same one-in-six chance. Two dice added together are not even at all, and this surprises people every time. There are six ways to make seven — 1+6, 2+5, 3+4, 4+3, 5+2, 6+1 — and exactly one way to make two. So seven turns up six times as often as snake eyes.
Add more dice and the effect gets stronger. With three dice the middle totals dominate and the extremes almost vanish. This is why the page prints the likeliest total beside the range: the range tells you what is possible, and that number tells you what to actually expect.
It matters at the table. A game that asks for 3d6 is not asking for a number from 3 to 18 with equal chances; it is asking for something near 10 or 11, with 3 and 18 as rare events. Designers pick dice precisely for that shape.
Why every die is shown
A total alone hides what happened, and plenty of rules care about the individual dice rather than the sum — a natural 20, a critical on any die, doubles, or a rule that rerolls ones. So each die is printed, and when you drop the lowest, the one that was dropped is marked rather than silently removed.
Where the randomness comes from
Each die comes from crypto.getRandomValues, and there is
a small honest detail here. Six does not divide evenly into the
generator's range, so simply taking the remainder would make low
faces very slightly likelier than high ones. The few leftover
values are thrown away and redrawn instead, which makes each face
exactly as likely as the others.
Frequently asked questions
What does 2d6+3 mean?
Two dice with six sides each, added together, then three added on top. Set 'how many dice' to 2, sides to 6, and the modifier to 3. The possible range becomes 5 to 15.
Is a 20 on a d20 as likely as any other number?
Yes, exactly as likely - one in twenty. It is only when you add dice together that the totals stop being even. A single die of any size is flat.
Why is 7 so common with two dice?
Because there are six different pairs that add up to 7 and only one pair that adds to 2. More ways to make a total means that total comes up more often. Seven is the peak for two six-sided dice.
What is 'drop the lowest' for?
Rolling character statistics in tabletop games, usually as 4d6 drop the lowest. It shifts the likely result upward without changing the highest possible roll. The dropped die is shown struck through so you can check it.
Can I roll dice with an odd number of sides?
Yes - anything from 2 to 1000 sides, including 3, 7 or 137. Physical dice have to be a shape that lands fairly, which is why real sets stop at a handful of numbers. A digital die has no such limit.
Is my text sent anywhere?
No. Everything happens in JavaScript inside your own browser. Nothing is uploaded and nothing is saved - close the tab and it is gone.