D&D Dice Roller

The standard D&D polyhedral set — sometimes called the "7-dice set" — includes:

• d4 — Tetrahedron. Used for small damage dice (daggers, darts, minor spells)
• d6 — Cube. Most common die: shortswords, Fireball, Rogue sneak attack
• d8 — Octahedron. Longswords, rapiers, Cleric hit dice
• d10 — Pentagonal trapezohedron. Heavy crossbows, halberds, Ranger hit dice
• d12 — Dodecahedron. Greataxes, Barbarian hit dice
• d20 — Icosahedron. All attack rolls, skill checks, saving throws
• d10 (tens) — Used alongside the regular d10 for percentile/d100 rolls

This tool loads the six core dice (d4 through d20) by default. Hit "Reset to Standard D&D Set" to restore this configuration at any time.

Dice pool notation is the standard way tabletop gamers describe a set of dice. The format is NdX where N is the count and X is the number of faces. "2d6" means two six-sided dice. "d20" means one twenty-sided die (the "1" is implicit). "2d6 + d20" means two d6s and one d20 all rolled together and summed. This tool shows your roll in this notation in the result card — so "d4 + d6 + d8 + d10 + d12 + d20" is immediately legible to any D&D player as the full polyhedral set roll. Multiple dice of the same type are grouped: three d6s become "3d6" rather than "d6 + d6 + d6."

Set two dice — one d20 (for the attack roll) and one for your weapon damage die. For example, for a Longsword attack:

1. Set die count to 2


2. Set die 1 to Icosahedron (20 faces) — your attack roll


3. Set die 2 to Octahedron (8 faces) — your d8 Longsword damage


4. Click Roll Dice

The d20 result tells you whether the attack hits (add your attack bonus, compare to the target's AC). If it hits, the d8 result is your damage before adding your Strength modifier. If the d20 shows 20 (amber glow), it's a Critical Hit — you'd roll the d8 again and add both results. Add extra dice to the pool for sneak attack, smite, or bonus damage effects.

Set two d20 dice in the pool and roll. For Advantage, take the higher of the two d20 results. For Disadvantage, take the lower. The tool shows both values in individual die cards — just read them and take the appropriate one. Both dice are labeled "d20" so there's no confusion. The total shown above is the sum of both (which you'll ignore — you only use one result for Advantage/Disadvantage), but the individual cards show each die's value clearly.

For a Critical Hit in D&D 5e, you roll all damage dice twice. To simulate this:

1. Identify your normal damage dice (e.g., 1d8 longsword + 2d6 sneak attack = 3 damage dice)


2. Double the count in this tool (6 dice instead of 3)


3. Set each die to the correct type (2 d8s + 4 d6s)


4. Roll — the total is your Critical Hit damage before adding modifiers

The amber glow on individual dice that rolled their maximum is a nice indicator of high-performing dice in your crit pool. Add your Strength or Dexterity modifier to the total manually after rolling.

Set the tool to 4 dice, all d6 — use the 'Reset to Standard D&D Set' first, then change all dice to Cube (6 faces) and set count to Four (or set the global type manually). Roll, then note the four values shown and mentally discard the lowest. The sum of the remaining three is your ability score. Repeat this six times (once for each ability: STR, DEX, CON, INT, WIS, CHA) and record the results. The average score using this method is approximately 12.24 per ability — above average, which is intentional in D&D 5e to make characters feel heroic from the start.

Yes — Pathfinder 1e and 2e use the same polyhedral dice as D&D. This tool works identically for Pathfinder attack rolls, damage, skill checks, and saving throws. Other systems using the same die types (13th Age, Starfinder, Index Card RPG, etc.) work just as well. For systems that use non-standard dice (like the d3 in some games, or d2 coin flip mechanics), the full die library is available in each die selector — scroll through to find any die type from d3 to d100.

Amber glow means the die rolled its maximum possible value. A d20 showing 20 glows amber (Critical Hit on an attack). A d6 showing 6 glows amber. A d12 showing 12 glows amber. This visual indicator makes Critical Hits and maximum damage rolls immediately visible across the whole dice pool — even with many dice on screen at once, you spot the amber instantly. Red glow means the die rolled a 1 — the minimum value, and an automatic miss on a d20 attack roll. Every other result shows in the neutral gray card style.

Yes — and it's more reliably fair than many physical dice. Physical polyhedral dice, especially cheaper sets, can have slight weight imbalances from manufacturing that cause certain faces to land down more often over thousands of rolls. This digital roller uses your browser's built-in random number generator seeded with cryptographic entropy from your operating system. Every face of every die has exactly 1/n probability per roll, every time, with complete independence between rolls. No physical bias, no wear, no "hot dice" phenomena.

Yes — click "Download Report" after rolling to generate a PDF containing the complete roll summary: dice pool notation (e.g., "d4 + d6 + d8 + d10 + d12 + d20"), individual results for each die, total score, per-die average, minimum, and maximum. The PDF is generated entirely in your browser — nothing is sent to a server. Useful for campaign logs, character creation records, or any table where showing your roll history is expected. The timestamp on the report makes it useful as a dated record.