Dice Roller

Free Online Dice Roller

This dice roller simulates fair rolls of any number of dice with any number of sides — d4, d6, d8, d10, d12, d20, d100, or custom. Add an optional modifier (+2, −1, etc.) for tabletop role-playing rules. The result panel shows the total, every individual die, and the full formula (like 3d6 + 2 = [4, 1, 6] + 2 = 13).

How to Roll Dice Online

Pick the number of dice (1-50), the type of die (d4 through d100), and any modifier. Click 🎲 Roll. The total + each individual die appears instantly. Quick-roll preset buttons cover the most common combos: 2d6, 3d6, 4d6 (drop-lowest for D&D character creation), 1d20 (attack rolls), 2d20 (advantage), 1d100 (percentile).

Common Dice Notations Explained

• 1d6 — roll one six-sided die (a standard cube)
• 2d6 — roll two six-sided dice and sum them (range 2-12, average 7)
• 3d6 — roll three six-sided dice and sum (range 3-18, average 10.5 — used for D&D ability scores)
• 4d6 drop lowest — D&D 5e character creation method (range 3-18, average ~12.2)
• 1d20 — twenty-sided die, the core of D&D 5e attack and skill rolls
• 2d20 with advantage/disadvantage — roll twice, take the higher (advantage) or lower (disadvantage)
• 1d100 — percentile die (1-100), used for crit/fumble tables and random encounter rolls

Use Cases for the Dice Roller

• Tabletop RPGs — D&D, Pathfinder, Call of Cthulhu, Vampire, Shadowrun — works for any system
• Board games — when you've lost a die or are playing remotely
• Probability lessons — show the bell curve of 2d6 vs the flat distribution of 1d12
• Random decision-making — pick a number 1-20 instantly
• Game design — test custom dice mechanics before building physical prototypes

Dice Probability — Quick Reference

• 1d6 → uniform 1/6 chance per face
• 2d6 → bell curve, 7 most common (1/6), 2 and 12 least (1/36 each)
• 3d6 → tighter bell curve centred on 10.5, range 3-18
• 1d20 → uniform 5% chance per face
• 2d20 with advantage → average ~13.8 vs 10.5 for a single roll

Frequently Asked Questions

Are these dice rolls truly random?

Yes — the tool uses your browser's secure-enough pseudo-random number generator. Long-run averages match what physical dice would produce. For tabletop games and decision-making it's indistinguishable from physical dice.

Can I roll custom-sided dice?

The dropdown covers d4, d6, d8, d10, d12, d20, and d100 — the standard set. For exotic dice (d3, d5, d7, d30 etc.) we recommend the upcoming custom-sided variant.

What does the green/red highlight mean?

Green = maximum possible value (a "natural 20" on a d20, "natural 6" on a d6 — a crit in most systems). Red = minimum (a "natural 1" — a fumble).

Is anything tracked or stored?

No. All rolls happen in your browser; your roll history clears when you close the page. Nothing is sent to a server.