Dice Roller
Pick your die, choose how many, add a modifier if you need one, and roll. Every individual result is shown, not just the total.
How the rolls are generated
Each die is rolled independently using your browser's cryptographic random number generator, with rejection sampling so every face is exactly equally likely. There is no seed, no pattern, and no server involvement. A physical die is subtly biased by manufacturing tolerances — pipped dice are famously slightly weighted towards the six, because the drilled pips remove material from that face — so a digital roll is, if anything, fairer.
Why 2d6 is not the same as 1d12
Both produce a range, but the shapes are completely different. One twelve-sided die is uniform — every result from 1 to 12 is equally likely. Two six-sided dice cluster hard around 7.
| Total on 2d6 | Ways to roll it | Probability |
|---|---|---|
| 2 or 12 | 1 | 2.8% |
| 3 or 11 | 2 | 5.6% |
| 4 or 10 | 3 | 8.3% |
| 5 or 9 | 4 | 11.1% |
| 6 or 8 | 5 | 13.9% |
| 7 | 6 | 16.7% |
Seven comes up six times more often than two. This is why board games that use 2d6 feel predictable while a d12 feels wild, even though both span a similar range.
Common dice and their averages
| Die | Range | Average roll | Typically used for |
|---|---|---|---|
| D4 | 1–4 | 2.5 | Small damage rolls |
| D6 | 1–6 | 3.5 | Board games, most damage rolls |
| D8 | 1–8 | 4.5 | Weapon damage |
| D10 | 1–10 | 5.5 | Percentile tens, damage |
| D12 | 1–12 | 6.5 | Heavy weapon damage |
| D20 | 1–20 | 10.5 | Attack rolls, skill checks |
| D100 | 1–100 | 50.5 | Percentage outcomes, loot tables |
How to use the Dice Roller
- Choose your die type, from D4 up to D100.
- Set how many dice to roll at once.
- Add a modifier if your game calls for one — it is added to the total, not to each die.
- Press Roll. Individual results are shown, with natural maximums and ones highlighted.
Frequently asked questions
Is this dice roller fair?
Yes. It uses crypto.getRandomValues with rejection sampling, so each face has exactly equal probability with no modulo bias.
Can I roll dice for Dungeons & Dragons?
Yes — every standard polyhedral die is here, along with a modifier field for adding your ability and proficiency bonuses. Natural 20s and natural 1s are highlighted automatically.
How do I roll with advantage?
Roll 2d20 and take the higher of the two individual results shown. For disadvantage, take the lower. The total is not what you want in either case.
How do I roll percentile dice?
Select D100 and roll one die. That is equivalent to the traditional d10 tens plus d10 units, giving a flat 1 to 100.
Are physical dice biased?
Slightly. Standard pipped casino-grade dice are filled to compensate, but ordinary board game dice have drilled pips that remove a little material, marginally favouring the six. The effect is small, but a digital roll avoids it entirely.
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Last reviewed September 4, 2026. Results are estimates for general information only.