Every face has a 1 in 12 chance — 8.3% each. Average roll: 6.5.
The d12 has a reputation as the neglected die — the one that comes in the set, stays in the bag, and gets picked up once a campaign. It is a running joke among players, and there is truth in it: for years it had almost no mechanical home.
Fifth edition gave it two. The greataxe deals 1d12, and the Barbarian rolls a d12 as their hit die, the largest in the game. If your table has a barbarian, the d12 sees more use than the d4.
This is the most-argued comparison in fifth edition, and the numbers are close enough to keep it interesting. The greataxe rolls 1d12 for an average of 6.5 and can hit for 12. The greatsword rolls 2d6, averages 7, and also tops out at 12 — but it can never roll below 2, and its results cluster in the middle.
On raw average the greatsword wins by half a point, and the Great Weapon Fighting style widens the gap, because rerolling 1s and 2s pays off twice as often on two dice as on one. The greataxe answers with variance: it rolls maximum damage more often, and it pairs better with the Barbarian’s Brutal Critical, which adds further single dice on a crit. Take the axe for the high roll and the fantasy; take the sword for the steadier number.
Twelve divides cleanly by 2, 3, 4 and 6, which no other die in the set can claim. That makes the d12 the natural tool for anything that comes in halves, thirds and quarters — months of the year, hours on a clock face, the six directions of a hex map doubled for near and far.
Game masters use it exactly that way. Drop a d12 on the table as a clock and it tracks the time until the guards come back. Roll it against a compass rose and it gives a direction and a distance in one throw. It is a better random-table die than its reputation suggests, and it is underused mostly because nobody thinks to reach for it.
More than a hundred hollow bronze dodecahedra have been dug up across what was Roman Gaul, Germania and Britain — twelve pentagonal faces, each pierced with a hole of a different size, knobs at every corner. They date from roughly the second to fourth centuries, and not one surviving Roman text mentions them.
Proposed explanations run from surveying instruments to knitting tools to religious objects, and the honest answer is that nobody knows. They are not dice — the holes rule that out — but they are the most famous dodecahedra in the world, and they are why the shape feels older than the game it ended up in.
2d6 averages 7 against the d12’s 6.5 and never rolls below 2, so the greatsword is the more consistent choice, especially with Great Weapon Fighting. The greataxe rolls maximum damage more often and works better with Brutal Critical. Half a point of average against a higher ceiling — both are defensible.
Historically it had almost no mechanical home: the d20 handled checks, the d6 handled nearly everything else, and the d12 sat between them without a job. Fifth edition gave it the greataxe and the Barbarian hit die, which is most of its modern use.
No. A d12 is flat — every number from 1 to 12 is equally likely. 2d6 is a bell curve that cannot roll a 1 and produces a 7 six times as often as a 12. Same top number, completely different shape.
Seven dice come in the set and new players are told to buy them before anyone explains what they do. This is what each one is for.
The maths behind why some rolls feel reliable and others feel like coin flips — with the numbers you can actually use at the table.
Every rulebook writes rolls in the same compact shorthand. Here is how to read it, including the keep and drop notation that trips people up.
Last updated: August 20, 2026
