How to Use the Dice Roller
The Dice Roller simulates any standard RPG dice type — D4, D6, D8, D10, D12, D20, and D100 (percentile dice) — in any quantity with optional modifiers. It's ideal for tabletop RPGs, board games, statistics exercises, and random number generation.
Select your dice type and number of dice, add any bonus or penalty modifier, and roll. The result displays each die's face value, the sum, and the total with modifier. Roll history tracks your recent results for reference during a game session.
A nuance for RPG players: the 'advantage/disadvantage' mechanic (from D&D 5e) involves rolling 2d20 and taking the higher (advantage) or lower (disadvantage) result. Our roller lets you roll 2d20 simultaneously and manually select — or use the built-in advantage toggle if available.
📊 Worked Example
Common dice rolling scenarios:
- D&D ability scores: 4d6 drop lowest
- D&D attack + damage: 1d20+5 to hit, 1d8+3 damage
- Percentile roll: 1d100 for random encounter table
- Board game movement: 2d6 (average 7, range 2–12)
Common Use Cases
- ✅ Rolling dice for D&D, Pathfinder, or other tabletop RPGs
- ✅ Playing board games that require dice without physical dice handy
- ✅ Teaching probability in a classroom context
- ✅ Generating random numbers in a specified range using dice
- ✅ Making fair random decisions with a defined set of options
- ✅ Rolling character stats or random tables in solo RPG play
Frequently Asked Questions
What is a D20 and why is it important?
A D20 (20-sided die) is the central die in many RPG systems, especially Dungeons & Dragons. It's used for attack rolls, skill checks, and saving throws. The flat probability (each number equally likely) means a 1 (critical fail) or 20 (critical success) each have a 5% chance on every roll — creating high drama in gameplay.
What is the difference between D10 and D100?
A standard D10 has faces 0–9 (or 1–10). To simulate a D100 (percentile dice), two D10s are rolled — one for tens, one for units. A result of '40' on the tens die and '7' on units = 47. A '0' and '0' typically means 100. Our virtual D100 simulates this directly, giving a single result from 1–100.
How are dice used in statistics education?
Dice are excellent for teaching probability. A single D6 has uniform distribution: each face has 1/6 probability. Rolling 2D6 produces a bell curve (7 most common at 6/36 = 16.7%). More dice create more normal distributions — demonstrating the Central Limit Theorem in action. Larger sample sizes converge on theoretical probabilities.
What is the average result of different dice types?
Average results: D4 = 2.5, D6 = 3.5, D8 = 4.5, D10 = 5.5, D12 = 6.5, D20 = 10.5, D100 = 50.5. For multiple dice, multiply: 2D6 average = 7. These averages are important in RPG damage calculations and character optimization.
Can I roll custom dice (e.g. D3, D7)?
While uncommon physical dice, custom die sizes can be simulated digitally. A D3 = roll a D6 and halve (round up): 1–2→1, 3–4→2, 5–6→3. A D7 = use our random number generator set to 1–7. Our dice roller focuses on standard RPG dice types, but the RNG tool handles any custom range.