D&D Dice Explained: What Every Die Does
Open a new set of Dungeons & Dragons dice and you'll find seven oddly shaped pieces of plastic, metal, or resin. Each one has a specific job. Once you know what every die is for — and how to read notation like "2d6+3" — the game becomes much easier to follow.
The Most Important Die Isn't the One That Does the Most Damage
The d12 and handfuls of d6s produce the biggest damage numbers, so they feel powerful. But the die that decides whether anything happens at all is the humble d20.
Every attack, skill check, and saving throw starts with a d20 roll. Damage only matters after the d20 says you succeeded.
We call this the d20 gate: the principle that almost every dramatic moment in D&D passes through a single twenty-sided roll before any other die hits the table.
The Standard Seven-Dice Set
| Die | Sides | Common uses |
|---|---|---|
| d4 | 4 | Small weapon damage (dagger), healing spells, some bonuses |
| d6 | 6 | Weapon damage (shortsword), sneak attack, many spells like Fireball |
| d8 | 8 | Weapon damage (longsword, rapier), many spells, some Hit Dice |
| d10 | 10 | Heavy weapon damage, Hit Dice for some classes |
| d% | 10 (marked 00–90) | Paired with a d10 for percentage rolls |
| d12 | 12 | Big weapon damage (greataxe), Barbarian Hit Dice |
| d20 | 20 | Attack rolls, ability checks, saving throws, initiative |
The d20: The Heart of the Game
The d20 is used for D20 Tests:
- Attack rolls — do you hit?
- Ability checks — do you succeed at a task?
- Saving throws — do you resist a danger?
Rolling a natural 20 on an attack roll is a critical hit, and a natural 1 on an attack roll always misses.
For the full rules, see D&D Rules Explained Without the Confusion.
The Damage Dice: d4, d6, d8, d10, and d12
When you hit, you roll damage dice based on your weapon or spell.
- Dagger: 1d4
- Shortsword: 1d6
- Longsword: 1d8 (1d10 when used with two hands)
- Heavy crossbow: 1d10
- Greataxe: 1d12
Spells often use multiple dice. Fireball, a famous third-level spell, deals 8d6 fire damage.
Hit Dice
Each class has a Hit Die, which determines how many hit points a character gains and how much they can heal during a short rest:
| Hit Die | Example classes |
|---|---|
| d6 | Sorcerer, Wizard |
| d8 | Bard, Cleric, Druid, Monk, Rogue, Warlock |
| d10 | Fighter, Paladin, Ranger |
| d12 | Barbarian |
The Percentile Die (d%)
The percentile die is a d10 marked 00, 10, 20, and so on up to 90. Roll it with a regular d10 to get a number from 1 to 100.
- d% shows 30 and d10 shows 7 → 37
- d% shows 00 and d10 shows 0 → 100
Percentile rolls are often used for random tables, like loot or encounters. See 100 Random D&D Encounter Ideas.
How to Read Dice Notation
D&D uses a simple shorthand:
XdY + Z
- X = number of dice
- Y = type of die
- Z = modifier to add
Examples:
- 1d20+5 → roll one d20 and add 5
- 2d6+3 → roll two d6, add them, then add 3
- 8d6 → roll eight d6 and add them together
The Math of Advantage and Disadvantage
Advantage means rolling two d20s and keeping the higher; disadvantage means keeping the lower. The effect is bigger than it looks:
| Roll type | Average result | Chance of rolling a natural 20 |
|---|---|---|
| Normal d20 | 10.5 | 5% |
| Advantage | about 13.8 | about 9.75% |
| Disadvantage | about 7.2 | 0.25% |
Advantage raises your average roll by more than three points and nearly doubles your chance of a critical hit.
We call this the hidden plus-three: advantage behaves roughly like a large bonus in the middle of the range, which is why the rule is so powerful despite being simple.
A Little Dice History
Early D&D players didn't have hobby dice shops. Polyhedral dice were often found in educational math supplies. Over time, dice became central to the hobby's identity. Game designer and dice maker Lou Zocchi became famous in gaming circles for promoting high-quality dice and for creating the Zocchihedron, a 100-sided die introduced in 1985.
Dice Etiquette at the Table
- Roll where others can see, especially in combat.
- Don't touch other players' dice without asking — some players are superstitious.
- Re-roll dice that fall off the table if your group agrees.
- Use digital dice if you're playing online or forgot your set.
A free online dice roller works in a pinch.
Dice Superstitions (Just for Fun)
Players develop all kinds of dice rituals: "punishing" dice that roll low, keeping "lucky" dice in a separate bag, or refusing to let anyone else touch their d20. None of these change the odds, but they're a beloved part of D&D culture. For more gaming psychology, read The Psychology Behind Why People Love D&D.
Quick Answers
What dice do you need for D&D?
D&D uses a standard set of seven dice: d4, d6, d8, d10, a percentile d10 marked in tens, d12, and d20. The d20 is used for attacks, checks, and saving throws, while the others are mainly used for damage, healing, Hit Dice, and random tables.
What does 2d6 mean in D&D?
2d6 means roll two six-sided dice and add the results together. Dice notation follows the format XdY+Z, where X is the number of dice, Y is the number of sides, and Z is a modifier added afterward, such as 2d6+3.
How much does advantage help in D&D?
Advantage raises the average d20 roll from 10.5 to about 13.8 and increases the chance of rolling a natural 20 from 5% to about 9.75%. Disadvantage lowers the average to about 7.2 and drops the chance of a natural 20 to just 0.25%.
Where D&D Dice Are Heading
Digital dice rollers are now built into most virtual tabletops and character apps. Our prediction: physical dice will become even more of a collectible and ritual object — handmade, artistic, and personal — while digital rolling handles the everyday math, especially for groups that play online.