The d6, properly introduced
Cubic dice show up in the Indus Valley and Mesopotamia by around 3000 BC, and the design has barely changed since: opposite faces still add up to seven, a convention already common in Roman tesserae. It won because it works. A cube tumbles well, lands flat, and reads instantly, which is why it runs everything from backgammon to Monopoly to the craps table.
Roll it for: board games, from backgammon to catan; craps and street dice; anywhere "roll a die" needs no further explanation. And if the d6 isn't the die your game asks for, the full dice roller has the other five.
- 6, numbered 1 to 6
- Cube, a Platonic solid
- 16.7% — exactly 1 in 6
- 3.5
- averages 7; totals range 2 to 12
- two 6s in a row: 1 in 36
D6 — frequently asked
A 6-sided die shaped as a cube, one of the five Platonic solids. The die everyone means when they say dice. Faces are numbered 1 to 6, and on a fair d6 each lands with exactly a 16.7% chance.
One in 6, or 16.7%, the same as every other face. Rolling two 6s back to back happens once in 36 attempts. The roller here uses rejection sampling on a cryptographic generator, so those odds hold exactly.
3.5. A fair die averages the midpoint of its range, so 2×d6 averages 7 and 3×d6 averages 10.5. Single rolls are flat: an average result is no more likely than a 6 or a 1.
Board games, from backgammon to Catan; Craps and street dice; Anywhere "roll a die" needs no further explanation. Beyond those, any decision with 6 options maps onto it directly.