Roll any dice you like — 3d6+2, a single d20, a fistful of d10s — see each die individually, and keep a history of the last twenty rolls.
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Reading dice notation
Tabletop games write dice rolls as NdS+M: N dice with S sides each, plus a modifier M. So 3d6+2 means roll three six-sided dice, add them up, then add 2 — a result between 5 and 20. A lone d20 is 1d20, the workhorse of most role-playing systems.
What each die is for
Die
Range
Typical use
d4
1–4
Small weapon and spell damage
d6
1–6
Board games, standard damage, stat rolls
d8 / d10 / d12
1–8 / 1–10 / 1–12
Weapon damage, hit dice
d20
1–20
Attack rolls, saves, skill checks
d100
1–100
Percentile rolls and loot tables
Where the modifier goes
By default the modifier is added once to the total, which is how attack and damage rolls normally work: 3d6+2 is the sum of three dice plus two. Occasionally a rule adds the bonus to every die instead — some weapon enchantments and healing effects work this way. Tick the box and 3d6+2 becomes three dice each with +2, worth six more in total.
A single d20 is flat: every number from 1 to 20 is equally likely. Add dice together and the distribution bunches toward the middle, because there are far more ways to make a middling total than an extreme one. On 2d6 there is exactly one way to roll 2 (snake eyes) but six ways to roll 7 — which is why 7 comes up six times as often, and why craps is built around it. With 3d6 the middle bulges harder still, and 10 or 11 turns up about eight times more often than 3 or 18.
Crits and fumbles
Any die showing its maximum is highlighted in green and any die showing a 1 in red, so a natural 20 or a natural 1 is obvious at a glance without hunting through the numbers. This is just visual — the calculator applies no game rules, since critical hits work differently in every system.
The dice are drawn from your browser's cryptographic random source, the same one used by the random number generator, so no result is predictable and nothing leaves your device.
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Frequently asked questions
What does 3d6+2 mean?
Roll three six-sided dice, add the results together, then add 2. The possible totals run from 5 (three ones plus two) to 20 (three sixes plus two), with 12 and 13 by far the most likely.
Are these dice fair?
Yes. Every face has an equal chance, drawn from your browser's cryptographically secure random source rather than a simple pseudo-random function. Nothing is weighted and no result is predictable.
Can I roll a d100 or percentile dice?
Yes — choose d100 from the list for a single roll from 1 to 100. If your table rolls two d10s as tens and units, roll 2d10 and read them separately from the individual dice shown.
What if I need an unusual die, like a d3 or a d30?
Choose 'Custom' and type any number of sides from 2 to 1000. A d3, d7, d30 and d1000 all work exactly the same way.
Does the roll history save if I close the page?
No. The history holds your last twenty rolls for the current session only and is cleared when you leave, since nothing is stored on your device or sent anywhere.