Online Dice Roller - Roll D20, D6, D&D Dice Free

About This Tool

This dice roller simulates standard polyhedral dice used in tabletop games like Dungeons & Dragons, Pathfinder, and other RPGs. All rolls use cryptographically secure random numbers for fair results.

Dice Types

• d4: Tetrahedron -- often used for small weapons and healing
• d6: Standard cube -- the classic die for many games
• d8: Octahedron -- common for medium weapons
• d10: Decahedron -- used for percentiles and some weapons
• d12: Dodecahedron -- great axes and some special abilities
• d20: Icosahedron -- the iconic D&D die for attacks and checks
• d100: Percentile die -- for percentage-based outcomes

Notation Guide

Dice notation follows the format NdX+M where N is the number of dice, X is the number of sides, and M is an optional modifier. For example:

• 1d20: Roll one 20-sided die
• 2d6: Roll two 6-sided dice and sum them
• 1d20+5: Roll one d20 and add 5 to the result

Dice Probability and Statistics

Understanding dice probability helps you make better tactical decisions in tabletop games. Here are the key statistics for each die type.

Advantage and Disadvantage (D&D 5e)

Rolling with advantage (two d20s, keep highest) increases your average from 10.5 to approximately 13.82. Rolling with disadvantage (two d20s, keep lowest) decreases it to approximately 7.18.

• Advantage: ~24.5% chance of rolling 18+, ~9.75% chance of natural 20
• Normal: ~15% chance of rolling 18+, ~5% chance of natural 20
• Disadvantage: ~2.25% chance of rolling 18+, ~0.25% chance of natural 20

What Dice Do You Need for D&D?

A standard 7-dice set for Dungeons & Dragons includes:

• 1 x d4 -- Small weapon damage (daggers), some spells
• 1 x d6 -- Common weapon damage, Sneak Attack, Fireball
• 1 x d8 -- Longsword damage, Cleric hit dice, healing spells
• 2 x d10 -- One for regular use, both together for percentile (d100) rolls
• 1 x d12 -- Greataxe damage, Barbarian hit dice
• 1 x d20 -- The most important die: attack rolls, ability checks, saving throws

Most players eventually accumulate more d6s (for spells like Fireball that use 8d6) and extra d20s for rolling with advantage.

Common D&D Rolls

Frequently Asked Questions

What dice do you need to play D&D?

To play Dungeons & Dragons, you need a standard 7-dice set: one d4 (4-sided), one d6 (6-sided), one d8 (8-sided), two d10s (for percentile rolls), one d12 (12-sided), and one d20 (20-sided). The d20 is used most often for attack rolls, ability checks, and saving throws.

What is a d20 in D&D?

A d20 is a 20-sided die (icosahedron) and the most important die in Dungeons & Dragons. It's used for attack rolls, ability checks, saving throws, and initiative. Rolling a 20 is called a "natural 20" or "critical hit," while rolling a 1 is a "natural 1" or "critical failure."

How do I read dice notation like 2d6+3?

Dice notation follows the format NdX+M. N is the number of dice to roll, "d" means "die" or "dice," X is the number of sides, and +M is a modifier added to the total. So 2d6+3 means roll two 6-sided dice, add them together, then add 3 to the result.

What is the average roll on a d20?

The average roll on a d20 is 10.5. This is calculated as (1+20)/2 = 10.5. For any die, the average is (minimum + maximum) / 2. When adding modifiers, add the modifier to 10.5 for your expected average result.

What are the odds of rolling a natural 20?

The probability of rolling a natural 20 on a d20 is exactly 5% (1 in 20). Each face of a fair d20 has an equal 5% chance of landing face up. The same 5% probability applies to rolling any specific number from 1 to 20.

What is the difference between d10 and d100?

A d10 has faces numbered 0-9 or 1-10 and generates results from 1-10. A d100 (or percentile dice) generates results from 1-100, typically by rolling two d10s -- one for the tens digit and one for the ones digit. A roll of 00 and 0 usually equals 100.

Is this dice roller truly random?

Yes, this dice roller uses cryptographically secure random number generation. Each roll is independent and has equal probability for each outcome, making it suitable for fair gameplay.

What is advantage and disadvantage in D&D 5e?

In D&D 5th Edition, advantage means rolling two d20s and taking the higher result. Disadvantage means rolling two d20s and taking the lower result. Advantage increases your average roll from 10.5 to about 13.8, while disadvantage decreases it to about 7.2.

What dice are used for damage in D&D?

Damage dice vary by weapon and spell. Common examples: daggers use 1d4, shortswords use 1d6, longswords use 1d8 (or 1d10 two-handed), greataxes use 1d12, and greatswords use 2d6. Spells like Fireball use 8d6. Higher dice generally mean more damage potential.

How do percentile dice (d100) work?

Percentile dice generate a number from 1-100 using two d10s. One die (often in a different color) represents tens (00, 10, 20... 90), the other represents ones (0-9). Read them together: 30 and 7 = 37. A roll of 00 and 0 is read as 100, not zero.

Why use 2d6 instead of 1d12?

While both have the same range (2-12 vs 1-12), 2d6 has a bell curve distribution with 7 being most common (16.7% chance), while 1d12 has equal probability (8.3%) for each result. Greatsword (2d6) deals more consistent damage than greataxe (1d12), but the greataxe has higher crit potential.

What is a critical hit?

In D&D 5e, rolling a natural 20 on an attack roll is a critical hit -- the attack automatically hits regardless of AC, and you roll the damage dice twice (then add modifiers once). Some classes like Champion Fighters can crit on 19-20 or even 18-20.

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Dice Roller FAQ