Dice Roller Simulator – Roll Any Dice Online

Roll any number of dice with any number of sides using our free online dice roller. Perfect for board games, D&D, and probability experiments with animated rolling effects and roll history tracking.

Number of Dice:

dice (1-100)

Die Type (Sides):

sides (2-1000)

Quick presets:

Understanding Dice Rolling and Probability

Dice have been used for games and decision-making for thousands of years. The most common die is the six-sided cube (D6), but role-playing games introduced many other shapes. Each die type serves different purposes – D20 for attack rolls in D&D, D6 for damage, D100 for percentile checks.

When you roll multiple dice, the results form a probability distribution. Rolling 1D20 gives each number a 5% chance. But rolling 2D6 creates a bell curve – 7 is most likely (16.7% chance), while 2 and 12 are least likely (2.8% each). This is why game designers choose specific dice combinations for different mechanics.

Common Dice Notation

Basic Notation

1D6One six-sided die

2D6Two six-sided dice

3D8 + 5Three eight-sided dice plus 5

4D6 drop lowestRoll 4D6, remove lowest die

RPG Dice Types

D4Tetrahedron (1-4)

D6Cube (1-6)

D8Octahedron (1-8)

D10Pentagonal trapezohedron (0-9)

D12Dodecahedron (1-12)

D20Icosahedron (1-20)

Worked Examples

Example 1: Rolling 2D6 (Common Damage Roll)

Dice: 2 six-sided dice

Possible range: 2 to 12

Most likely result: 7 (16.7% probability)

Least likely: 2 or 12 (2.8% each)

2D6 creates a bell curve. Average damage is 7, making it predictable for game balance.

Example 2: Rolling 1D20 (D&D Attack Roll)

Dice: 1 twenty-sided die

Possible range: 1 to 20

Each result: 5% probability

Natural 20: Critical hit

The D20 gives a flat distribution – every number equally likely. This creates dramatic swinginess in combat.

Example 3: Rolling 4D6 Drop Lowest (Character Stats)

Dice: 4 six-sided dice, remove lowest

Possible range: 3 to 18

Average result: ~12.24

This method generates D&D character ability scores. Dropping the lowest die skews results higher than 3D6.

Example 4: Rolling 2D10 (Percentile Tens)

Dice: 2 ten-sided dice (one for tens, one for ones)

Possible range: 00 to 99 (or 1-100)

Each result: 1% probability

Percentile rolls determine success against percentage-based skills. Roll 00 and 0 = 100 (critical success).

Example 5: Rolling 10D6 (Fireball Damage)

Dice: 10 six-sided dice

Possible range: 10 to 60

Average: 35

Many dice create a tight bell curve. Results cluster around the average. Very unlikely to roll extreme values.

Quick Fact

The oldest known dice were found in Iraq and date back over 5,000 years. Ancient dice weren't always fair – some archaeological finds show loaded dice with certain numbers appearing more often. The standard cube shape became dominant because it's easy to manufacture and rolls unpredictably. Modern casino dice are precision-machined to within 0.0005 inches for perfect fairness.

Frequently Asked Questions

What does "XdY" mean in dice notation?

X is the number of dice, Y is the number of sides. So 3D8 means "roll three eight-sided dice." You might also see modifiers like 2D6+3 (roll two six-sided dice and add 3).

Why do D10s have numbers 0-9 instead of 1-10?

The 0 represents 10 on a single D10. When rolling percentile dice (2D10), one die shows tens (00, 10, 20...90) and the other shows ones. A result of 00 + 0 = 100, not zero.

Are digital dice rolls truly random?

Computer dice use pseudo-random number generators (PRNGs). They're not truly random but are statistically random enough for games. The sequence is determined by a seed value, but for gaming purposes, the results are effectively unpredictable.

What's the average roll of a die?

For a single die, average = (1 + max) / 2. So D6 averages 3.5, D20 averages 10.5. For multiple dice, multiply: 2D6 averages 7, 3D8 averages 13.5.

Can I use this for actual board games?

Absolutely. Many online board game groups use digital rollers when playing remotely. Just agree with your group that everyone trusts the roller – there's no physical verification possible.

What happens if I roll 100 dice?

The calculator supports up to 100 dice. With that many dice, results cluster tightly around the average due to the law of large numbers. Rolling 100D6 will almost always give a result between 300-400 (average 350).

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