About the Dice Roller
Dice Types Explained
Standard tabletop dice come in 7 sizes. The d6 is the everyday 6-sided die used in board games. The d20 is the iconic 20-sided die central to Dungeons & Dragons. The full polyhedral set (d4, d6, d8, d10, d12, d20) is used across most tabletop RPGs. A d100 (percentile die) generates 1–100 and is often simulated using two d10s.
Using Modifiers
A modifier is a fixed number added to or subtracted from the dice total. In D&D 5e, ability score modifiers (typically −5 to +5) apply to relevant rolls. For example, rolling 1d20+5 means rolling one d20 then adding 5 to the result. Enter your modifier in the Modifier field — it is shown separately in the results so you can see both the raw roll and the adjusted total.
Dice Probability
Each face of a fair die has an equal probability of appearing. A single d6 has a 1-in-6 (~16.7%) chance per value. With multiple dice, results follow a bell-curve — extremes become unlikely and the mean dominates. Rolling 2d6 has only a 1-in-36 (~2.8%) chance of rolling snake-eyes (2) or boxcars (12), while 7 is the most probable result at 6-in-36 (~16.7%).
Common Uses
Tabletop RPGs (D&D, Pathfinder, Shadowrun) — attack rolls, damage rolls, skill checks and saving throws.
Board games — movement, combat resolution, event tables.
Probability education — demonstrating uniform distributions and the law of large numbers.
Random decisions — loot tables, encounter generation, name selection.
Frequently Asked Questions
Can I roll different dice types at the same time? The roller uses one dice type per throw. For mixed rolls (e.g. 2d6 + 1d8), roll each type separately and add the totals together.
What is a d100? A d100 (percentile die) generates a number from 1 to 100. It is traditionally rolled using two d10s — one for the tens digit and one for the units — treating 00 as 100.
How many dice can I roll at once? Up to 50 dice simultaneously. The statistics panel shows your total, average, highest and lowest across all dice.
Are the rolls fair? Yes. Each face has equal probability. The roller uses Math.floor(Math.random() * sides) + 1, which gives a uniform discrete distribution.
What dice does D&D use? D&D 5e uses all seven polyhedral dice: d4, d6, d8, d10, d12, d20 and d100. The d20 is most iconic — it is used for attack rolls, ability checks and saving throws.
Related Calculators
- Scientific Calculator — Full scientific calculator with trig, log, powers and memory.
- Percentage Calculator — Calculate percentages, increases, decreases and percentage of.
- Fraction Calculator — Add, subtract, multiply and divide fractions with simplification.