What is a Polyhedral Dice Roller?
A Polyhedral Dice Roller is a specialized tabletop gaming tool designed to simulate multi-sided dice used in popular role-playing games (RPGs) including Dungeons & Dragons (D&D 5e), Pathfinder, Warhammer, Call of Cthulhu, and Shadowrun. Supporting standard polyhedral polyhedra (d4, d6, d8, d10, d12, d20, and d100 percentile dice), this simulator includes modifier arithmetic, Advantage/Disadvantage mechanics, and automatic Critical Hit detection.
Dungeons & Dragons (D&D 5e) Standard Dice Notation
Tabletop roleplaying games use standard dice notation expressed in the format NdX + M, where:
- $N$: The number of dice to roll (e.g.
2d20means rolling two 20-sided dice). - $X$: The number of geometric faces on each die ($X \in \{4, 6, 8, 10, 12, 20, 100\}$).
- $M$: Flat numerical modifiers applied to the roll (such as ability score modifiers, proficiency bonuses, or spell damage multipliers).
Polyhedral Dice Types & In-Game Uses
| Die | Geometry | Range | Primary Gaming Purpose |
|---|---|---|---|
| d4 | Tetrahedron | 1 – 4 | Daggers, Healing Potions (2d4+2), Magic Missile |
| d6 | Cube (Standard) | 1 – 6 | Greatswords (2d6), Rogue Sneak Attack, Fireball (8d6) |
| d8 | Octahedron | 1 – 8 | Longswords, Rapiers, Cure Wounds, Divine Smite |
| d10 | Pentagonal Trapezohedron | 1 – 10 | Halberds, Heavy Crossbows, Eldritch Blast cantrips |
| d12 | Dodecahedron | 1 – 12 | Barbarian Greataxe, Barbarian Hit Dice |
| d20 | Icosahedron | 1 – 20 | Core d20 System: Attack rolls, Saving Throws, Ability Checks |
| d100 | Percentile | 1 – 100 | Wild Magic Surges, Divine Intervention, Loot tables |
Frequently Asked Questions
How does Advantage and Disadvantage work in D&D 5e?
When you have Advantage, you roll two d20 dice and take the higher value. When you have Disadvantage, you roll two d20 dice and must take the lower value. Select Advantage or Disadvantage in our rule dropdown to automatically drop the unused die.
What is a Natural 20 (Nat 20) Critical Hit?
In D&D 5e, rolling a natural 20 on a 20-sided die represents a Critical Hit during an attack roll, meaning an automatic hit regardless of the target's Armor Class (AC), allowing the attacker to roll all damage dice twice.
Are online dice rolls truly fair?
Yes. Our dice simulator uses hardware-entropy cryptographic pseudo-random number generators (CSPRNG via window.crypto.getRandomValues) to ensure every face has an exact, uniform $1/S$ probability of landing.
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