A dice roller for whenever the physical dice have gone missing — under the sofa, in another game’s box, or never owned in the first place. Choose how many dice and how many sides, roll, and see every die plus the total. It covers standard six-sided dice and the full polyhedral set (d4, d6, d8, d10, d12, d20) used in tabletop RPGs.
How is it calculated?
Dice notation
Tabletop games describe rolls as *NdS* — N dice of S sides. “2d6” means roll two six-sided dice and add them; “1d20” is a single twenty-sided die. Set N and S here and the tool rolls them all at once, showing each face and the sum.
Each die is independent and fair
Every die is an equal-chance draw across its faces, rolled separately. With one die the outcomes are flat — each face equally likely. Add dice together and the totals bunch toward the middle:
| Roll | Most likely total |
|---|---|
| 1d6 | all equal (1–6) |
| 2d6 | 7 |
| 3d6 | 10–11 |
That’s why 2d6 centres on 7: there are more ways to make 7 than to make 2 or 12.
Uses
- Replacing lost dice for board games
- Tabletop RPGs (D&D and others) needing d20, d8, d4…
- Random selection and classroom probability
Worked example
Roll 2d6 and you might get a 4 and a 5 for a total of 9. Over many rolls, 7 comes up most often because six different face combinations make it (1-6, 2-5, 3-4 and their mirrors), while only one combination makes 2 (1-1) or 12 (6-6). A single d20, by contrast, is flat — every number from 1 to 20 is equally likely, which is why it’s used for one-off checks in RPGs.
FAQ
What dice can I roll?+
From one to twenty dice at a time, in the standard polyhedral sizes: d4, d6, d8, d10, d12 and d20. Set the count and the type, and every die is rolled and shown along with the combined total.
What does “2d6” mean?+
It’s dice notation: 2 dice of 6 sides each, rolled and added together. The number before the “d” is how many dice, the number after is how many sides. So 3d8 is three eight-sided dice summed.
Are the rolls fair?+
Yes — each die is an independent, equal-chance draw across its faces. There’s no bias and no dependence on previous rolls, just like fair physical dice.
Why does the total of two dice favour the middle?+
Because more face combinations produce middle totals. With 2d6 there are six ways to roll a 7 but only one way to roll a 2 or a 12, so 7 is six times more likely. Single dice, by contrast, are perfectly flat.
Can I use it for Dungeons & Dragons?+
Yes — it supports the full d4–d20 set that tabletop RPGs use, and lets you roll multiple dice at once for damage or ability rolls. It’s a drop-in replacement when your physical dice aren’t to hand.