The Dice Roller simulates rolling any number of standard or custom dice — d4, d6, d8, d10, d12, d20, d100, or any sided die you specify — with an optional modifier for RPG and tabletop gaming.

How to Use This Calculator

1. Enter the Number of Dice to roll (1–20).
2. Select the Sides per Die or choose “Custom” to enter any number.
3. Enter a Modifier to add or subtract from the total (e.g., +3 for a stat bonus).
4. Click 🎲 Roll Dice.

Common Dice in Tabletop Gaming (D&D, Pathfinder)

• d4: Small weapons, minor healing (daggers, cure minor wounds)
• d6: Short swords, fireballs (the most common die in games)
• d8: Longswords, ranger hit dice
• d10: Heavy weapons, glaives
• d12: Great axes, barbarian hit dice
• d20: Ability checks, attack rolls, saving throws — the iconic D&D die
• d100 (d%): Percentile tables, wild magic surges

Dice Notation

Tabletop games use shorthand like “2d6+3” — this means roll 2 six-sided dice and add 3 to the total. This calculator supports that exact format: set dice count to 2, sides to 6, modifier to +3.

Frequently Asked Questions

How is the random roll generated?

Each die roll uses Math.floor(Math.random() × sides) + 1, producing a uniformly distributed integer from 1 to the number of sides.

Can I roll more than 20 dice?

The maximum is 20 dice per roll to keep the interface clean. For very large rolls (e.g., 100d6 for a fireball area), consider rolling in batches and summing the totals.

Understanding Dice Notation

Tabletop games describe dice rolls with notation like 2d6+3. The number before the “d” is how many dice to roll, the number after is how many sides each die has, and any “+” or “−” is a modifier added to the total. So 2d6+3 means “roll two six-sided dice and add 3.” This calculator supports d4, d6, d8, d10, d12, d20, d100, and any custom number of sides.

Probability Basics

A single fair die gives every face an equal chance. With one d6, each number 1–6 has a 1-in-6 (about 16.7%) probability. When you roll multiple dice and sum them, the totals form a bell-shaped curve: with 2d6 the most likely total is 7 (six ways to make it), while 2 and 12 are the rarest (one way each). This is why many board and role-playing games are balanced around the 2d6 average of 7.

Common Uses

• Tabletop RPGs like Dungeons & Dragons (d20 checks, damage rolls).
• Board games when physical dice are missing.
• Classrooms for teaching probability and statistics.
• Fair decisions and random draws where you need an unbiased number.