October 5, 2026 • 6 min read

D&D Dice Guide: What Every Die Is Actually For

Seven dice, endless confusion for new players. This dnd dice guide explains what the d4, d6, d8, d10, d12, and d20 each do at the table — so you can stop asking "which one is this?" mid-combat.

What Dice Come in a Standard D&D Dice Set?

A standard set has seven dice: one d4 (pyramid), one d6 (cube), one d8, two d10s (one usually marked 00–90 for percentile rolls), one d12, and one d20. That's the complete kit — every roll in Dungeons & Dragons 5th edition uses one of these. The d6 also moonlights in countless board games, which is why every household seems to own a dozen of them and zero d12s.

If you're joining your first session tonight, you don't strictly need to buy anything: a virtual dice roller handles every die in the set. But physical dice are half the ritual, so let's learn what each one does.

The d20: The Story Die

The twenty-sided die is the engine of the game. Nearly everything uncertain runs through it: ability checks (can I pick this lock? roll d20, add your Dexterity modifier, beat the difficulty class), attack rolls (d20 plus your attack bonus versus the target's Armor Class), and saving throws (d20 plus the relevant modifier to resist poison, magic, dragon breath, and so on).

Two results are legendary. A natural 20 — the die itself showing 20, before modifiers — is a critical hit in combat: you roll your damage dice twice. A natural 1 is a critical miss: your attack fails no matter how big your bonus is. New players quickly learn that the d20 giveth and the d20 taketh away, often within the same round.

D&D Dice Guide to Damage: d4 Through d12

Once the d20 decides you hit, a smaller die decides how much it hurt. Bigger, scarier weapons use bigger dice:

d4 — daggers, darts, and the wizard's beloved magic missile (which auto-hits, making the tiny die feel great). The pyramid is famously the caltrop of the dice world: step on one barefoot and you'll understand.

d6 — shortswords, bows, and the mighty fireball, which rolls a glorious eight of them. The workhorse damage die.

d8 — longswords, battleaxes, and most martial weapons. If your fighter uses one weapon, it's probably a d8.

d10 — heavy weapons like halberds and glaives, usually wielded two-handed for the bigger die.

d12 — the barbarian's greataxe and not much else, which makes it the most characterful die in the bag. Rolling a d12 announces that someone is about to have a very bad day.

The pattern is simple: the d20 asks "did it work?", and the damage die answers "how well?"

The d10 Pair: Percentile Dice

That second d10 — the one marked 00, 10, 20 up to 90 — exists for percentile rolls. Roll both d10s together: the tens die and the ones die combine into a number from 1 to 100. (Double zeros means 100, by ancient convention.) The DM uses percentile dice for loot tables, random encounters, and those moments when they want fate to feel extra granular. Need a quick percentile roll without the special die? A random number generator set to 1–100 does the same job.

Hit Dice and Healing

Each class has a hit die — d6 for wizards, d8 for rogues and clerics, d10 for fighters, d12 for barbarians — representing how tough you are. When you take a short rest, you can spend hit dice to recover: roll the die, add your Constitution modifier, regain that many hit points. It's the game's way of saying "bandage up and keep going" without a full night's sleep. You get your spent hit dice back slowly, so spending them is a real resource decision, especially in dungeon crawls.

Advantage and Disadvantage

One of 5th edition's most elegant mechanics: when circumstances favor you, roll two d20s and take the higher (advantage); when they work against you, roll two and take the lower (disadvantage). Hiding in shadows before an ambush? Advantage. Trying to persuade the guard while on fire? Disadvantage. It replaces fiddly piles of modifiers with a single, dramatic double-roll — and nothing at the table gets a bigger reaction than watching two d20s tumble when you need one good number.

Digital Dice vs. Physical Dice

Physical dice have ritual: the shake, the tumble, the groan when a d20 lands on 1. Digital dice have convenience: every die you'll ever need, no bag required, perfect for online games on Roll20 or Discord. The odds are identical either way — a fair d20 is a fair d20. Many tables use both: physical dice at the table, a dice roller for the player who forgot theirs (there's always one) or for the DM rolling twenty goblin attacks at once.

Table Etiquette and Dice Superstitions

Every table develops its own dice lore. Common customs: roll in the open where everyone can see (dice towers and trays exist for exactly this reason), don't touch another player's dice without asking, and retire a die that's rolled three natural 1s in a row — not because the math changed, but because the table demands a sacrifice. As for superstitions — lucky dice, dice jails for misbehaving rollers, blowing on them for luck — they're nonsense, of course. They're also completely mandatory.

Frequently asked questions

Try it yourself

Need every die in this guide right now? Roll a d20 — or a d4, d6, d8, d10, or d12 — with the free dice roller.

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