DnD Dice Explained — What Each of the Seven Dice Is Actually For
A standard polyhedral set has seven dice: d4, d6, d8, d10, a second d10 marked in tens, d12 and d20. New players are usually told to buy a set before anyone explains what the dice are for, which is backwards. Here is what each one actually does at a table.
The d20 does the deciding
If you only understand one die, make it this one. In fifth-edition DnD, almost every moment of uncertainty is resolved by rolling a d20, adding a modifier, and comparing the result to a number.
Three kinds of roll use it:
- Attack rolls — did you hit? Roll d20, add your attack bonus, compare to the target’s Armour Class.
- Ability checks — can you do the thing? Roll d20, add the relevant ability and proficiency, compare to a DC the DM sets.
- Saving throws — can you avoid the thing? Same roll, triggered by something happening to you rather than something you attempted.
Everything else in the game — initiative, death saves, perception — is one of those three wearing a different hat.
The d20 is flat, meaning every number is equally likely, and that has a real effect on how the game feels. Your +7 bonus is genuinely large, but a d20 still spans nineteen points, so the expert fails and the amateur succeeds far more often than they would in a system built on multiple dice. The d20 page covers what a natural 20 does and does not do, which is the single most commonly misremembered rule in the game.
The d6 does the volume
The d6 is the damage die, the utility die, and the one you need most copies of. It handles:
- Small weapon damage — shortswords, quarterstaffs, hand crossbows, most simple weapons.
- Big spell damage — Fireball is 8d6, Disintegrate is 10d12 plus 40, but the general pattern is that when a spell needs to be scary, it gets more d6s rather than a bigger die.
- Sneak Attack — a rogue’s signature, adding d6s in pairs as they level. At level 11 that is 6d6 on top of the weapon.
- Character creation — 4d6, drop the lowest, six times. See rolling stats.
- Bardic Inspiration, Guidance’s bigger cousins, and dozens of small bonuses.
A set gives you one d6. Buy more. A level-11 rogue rolling 6d6 one die at a time is a slow rogue.
The d8 is the middle of the game
The d8 is the most common hit die in fifth edition — Bards, Clerics, Druids, Monks, Rogues and Warlocks all use it — and it does most of the healing in the game as well. Cure Wounds, Healing Word and Lay on Hands are all counted in d8s.
It is also the versatile-weapon die. A longsword deals 1d8 in one hand and 1d10 in two, which is the trade a sword-and-board fighter makes every time they decide whether to carry a shield. Battleaxes and warhammers work the same way, as do the rapier and longbow at a flat 1d8.
The d10 does two jobs
The d10 has the front-line hit die: Fighters, Paladins and Rangers. It handles heavy weapon damage — the heavy crossbow, the pike, the two-handed grip on a versatile weapon.
Its second job is percentile. A set includes two d10s for exactly this reason: one marked 0–9 and one marked 00–90, rolled together to give a number from 1 to 100. That is how wild magic surges, treasure hoards and random encounter tables are generated. The d10 page explains why the die reads 0 instead of 10, which confuses nearly everyone the first time.
The d12 belongs to the barbarian
The d12 is famously the least-used die in the set. In fifth edition it has two homes: the greataxe deals 1d12, and the Barbarian rolls a d12 for hit points, the biggest hit die in the game.
If nobody at your table plays a barbarian or swings a greataxe, your d12 may genuinely sit unused for a campaign. That is not a defect of the die so much as an accident of design history — the d12 page goes into the greataxe-versus-greatsword maths, which is closer than it looks.
The d4 does the small stuff
The d4 is light-weapon damage: daggers, darts, clubs, sling bullets. It is also the bonus die for Bless and Guidance, two of the most-used low-level spells in the game, and each dart of Magic Missile deals 1d4+1.
It is the die most likely to go missing, because a tetrahedron does not roll so much as tip over and skid. Many players keep one on the table as a counter for rounds remaining or spell slots used, precisely because it stays where you put it.
Hit dice at a glance
Hit dice do two things: they set how much health you gain per level, and they are what you spend on a short rest to heal.
| Hit die | Classes |
|---|---|
| d6 | Sorcerer, Wizard |
| d8 | Artificer, Bard, Cleric, Druid, Monk, Rogue, Warlock |
| d10 | Fighter, Paladin, Ranger |
| d12 | Barbarian |
The pattern is legible: the further forward you expect to stand, the bigger your die. A wizard on a d6 and a barbarian on a d12 will drift roughly three hit points apart per level, which compounds into a very large gap by level ten.
What to buy
One set is enough to play. Any seven-die set works; the expensive ones are prettier, not fairer.
Then buy extra d6s. Eight of them, ideally, so Fireball is one throw. If you plan to roll characters rather than use the standard array, you want four matching ones anyway.
Then a second d20, for advantage and disadvantage. Rolling the same die twice works fine, but two at once is faster and feels better.
Beyond that, more dice are a hobby rather than a requirement. A single set and a phone will run a campaign perfectly well — you can roll any of the seven right here, and there is a dedicated page for each die with the specifics.
The two rules new players actually need
Read the notation. 2d8+3 means roll two d8s, add them, then add three — not add three to each. Dice notation takes about five minutes to learn and removes most of the confusion in the rulebook.
More dice means more predictable, not just bigger. 2d6 and 1d12 both top out at 12, but 2d6 averages a half-point higher and lands near the middle far more often. Designers use that difference deliberately, and once you notice it you will see it everywhere in the game’s maths. The probability guide covers why.