About Dice Roller

Roll standard RPG dice notation — 3d6+2, 2d20-1, mixed. Part of the DevTools Surf developer suite. Browse more tools in the Fun / Niche collection.

Use Cases

• Tabletop RPG players rolling dice during online game sessions
• Game developers testing probability distributions for combat mechanics
• Math teachers demonstrating probability concepts with interactive dice rolls
• Board game designers prototyping mechanics with custom dice expressions

Tips

• Type 3d6+2 to roll three six-sided dice and add a modifier of 2
• Use mixed notation like 2d20+1d4 for complex RPG attack rolls
• Check individual die results alongside the total for transparency

Fun Facts

• Dice notation (NdX) was popularized by Dungeons & Dragons in 1974, created by Gary Gygax and Dave Arneson. The d20 became the game's most iconic die.
• A standard 7-die RPG set (d4, d6, d8, d10, d10%, d12, d20) was standardized by TSR in the late 1970s and hasn't changed in over 45 years.
• Mathematically fair dice must have faces that are congruent — this limits fair dice to 5 Platonic solids (d4, d6, d8, d12, d20) plus special shapes like d10.

FAQ

What notation does it support?

Standard RPG: `3d6` (three six-sided dice), `2d20+5` (with modifier), `1d100` (percentile), `4d6kh3` (drop lowest — character creation), and mixed expressions.

Which RPG systems?

System-agnostic notation. D&D 5e (d20 + mod), Pathfinder (d20), Shadowrun (d6 pools), and dozens more use this notation. Pick the expression that matches your rulebook.

Is it cryptographically random?

Yes — crypto.getRandomValues. More random than a physical die (real dice have slight weight bias).

What about critical hits and fumbles?

The tool shows raw rolls — crit/fumble interpretation is rule-specific. A 20 on a d20 is the critical range in D&D; different systems handle it differently.