What is the probability of rolling each number on a die?

On a fair 6-sided die, each number (1-6) has exactly 1/6 probability (16.67%). The sum of all probabilities equals 1 (100%). Two dice: 36 possible combinations, with 7 being most likely (6/36 = 16.67%).

What are common dice notations?

Dice notation uses XdY: X dice with Y sides. 2d6 = roll two 6-sided dice. 1d20 = roll one 20-sided die. Modifiers: 2d6+3 = roll 2d6 and add 3. Used in tabletop RPGs, board games, and probability exercises.

What types of dice exist?

Common dice: d4 (tetrahedron), d6 (cube), d8 (octahedron), d10 (pentagonal trapezohedron), d12 (dodecahedron), d20 (icosahedron). d100 (percentile) often uses two d10s. Non-standard dice include d3, d30, and specialty dice.

What is the average roll for different dice?

Average = (min + max) / 2. d6 average = 3.5. d20 average = 10.5. For multiple dice, multiply: 2d6 average = 7, 3d6 average = 10.5. The more dice rolled, the more results cluster around the average (normal distribution).

How fair are physical vs digital dice?

Quality physical dice are balanced but can have microscopic imperfections. Casino dice are precision-made to 1/10000 inch tolerance. Digital dice use algorithms that are mathematically fair, though some argue they "feel" different. For any serious application, use quality dice or verified RNG.

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Dice Roller

Standard dice probability: each face on a fair d6 has 1/6 (16.67%) chance. Dice notation: 2d6 means roll two 6-sided dice. Average roll = (min + max) / 2. For d6, average = 3.5. For 2d6, average = 7.

Roll virtual dice online. Supports d4, d6, d8, d10, d12, d20, d100. Roll multiple dice with modifiers for RPGs.

Dice Type

Number of Dice

Modifier

Rolling: 1d6

Press Space to roll

Dice Guide

d4, d6, d8, d10, d12, d20: Standard RPG dice
d100: Percentile die for percentage-based checks
Modifier: Added to total (e.g., +5 for ability bonus)
Green highlight = max roll, Red = min roll (natural 1 or 20)

How to Use

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Click the Calculate/Convert button
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Frequently Asked Questions

What is the probability of rolling each number on a die?: On a fair 6-sided die, each number (1-6) has exactly 1/6 probability (16.67%). The sum of all probabilities equals 1 (100%). Two dice: 36 possible combinations, with 7 being most likely (6/36 = 16.67%).
What are common dice notations?: Dice notation uses XdY: X dice with Y sides. 2d6 = roll two 6-sided dice. 1d20 = roll one 20-sided die. Modifiers: 2d6+3 = roll 2d6 and add 3. Used in tabletop RPGs, board games, and probability exercises.
What types of dice exist?: Common dice: d4 (tetrahedron), d6 (cube), d8 (octahedron), d10 (pentagonal trapezohedron), d12 (dodecahedron), d20 (icosahedron). d100 (percentile) often uses two d10s. Non-standard dice include d3, d30, and specialty dice.
What is the average roll for different dice?: Average = (min + max) / 2. d6 average = 3.5. d20 average = 10.5. For multiple dice, multiply: 2d6 average = 7, 3d6 average = 10.5. The more dice rolled, the more results cluster around the average (normal distribution).
How fair are physical vs digital dice?: Quality physical dice are balanced but can have microscopic imperfections. Casino dice are precision-made to 1/10000 inch tolerance. Digital dice use algorithms that are mathematically fair, though some argue they "feel" different. For any serious application, use quality dice or verified RNG.

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