About Dice Roller
Roll 1-10 dice with animated results and history. Free online dice roller. Free, no sign-up required.
How to use
- Pick a die size from the side-buttons: d4, d6 (standard cubic), d8, d10, d12, or d20. The active button highlights so you know which die is loaded. d6 is the default for board games; d20 is the standard D&D check.
- Set the quantity using the − and + buttons. Roll one die for a quick decision, or two-to-ten for board games (Monopoly = 2d6) and tabletop RPG damage rolls (3d6, 4d8).
- Click Roll Dice to roll all selected dice at once. Each die animates briefly, then lands on a face. The total is shown for multi-die rolls so you don't have to add by hand.
- Read the history strip below to see your last several rolls. Useful for verifying suspicious streaks ('did I really roll three 1s in a row?') and for keeping track of running totals across a board-game session.
- For a percentile roll (1-100, often called d100), select d10 and roll twice — first roll is the tens digit, second is the ones (00 reads as 100). Or just use the Random Number Generator with range 1-100.
- For D&D 5e advantage, roll 2d20 and take the highest. For disadvantage, roll 2d20 and take the lowest. The Dice Roller shows both results so you can apply either rule.
Frequently asked questions
What is the probability distribution for multiple dice?
A single die is uniform — every face has equal odds (1/6 for d6, 1/20 for d20). But the sum of multiple dice forms a bell curve. Two d6 produces totals from 2-12, with 7 the most likely (6/36 = 16.67%) because there are six ways to roll 7 (1+6, 2+5, 3+4, 4+3, 5+2, 6+1). 2 and 12 are the rarest (1/36 each). Three d6 peaks at 10-11. As you add more dice, the distribution narrows toward the average — the central limit theorem in action.
What dice does Dungeons & Dragons use?
The standard 7-die set: d4 (caltrop-shaped), d6 (cube), d8 (octahedron), d10 (pentagonal trapezohedron, often two of them — one for tens, one for ones to roll percentiles), d12 (dodecahedron), and d20 (icosahedron). The d20 is rolled most: attack rolls, ability checks, saving throws. Damage uses smaller dice — daggers do 1d4, longswords 1d8, greatswords 2d6. A fireball does 8d6 damage, which averages 28 but ranges 8-48 with a tight bell-curve distribution around 28.
What is dice notation like 3d6+2?
Standard tabletop shorthand. 3d6+2 means: roll three 6-sided dice, sum them (3-18), then add 2 to the total (5-20). The format is XdY±Z where X is quantity, Y is sides, Z is a flat modifier. 1d20+5 is one twenty-sided die plus 5. 4d8 is four eight-sided dice with no modifier. Some games use 'kh' (keep highest) or 'dl' (drop lowest): 4d6kh3 means roll four d6, drop the lowest, sum the rest — the standard D&D ability score generator.
Are these dice rolls really fair?
Yes — uniform distribution across all faces, generated from your browser's PRNG. Statistically indistinguishable from a perfect physical die over thousands of rolls. Real-world dice can have small manufacturing biases (a die's face with the most pips has slightly less mass on that side, biasing it slightly toward landing pips-down). Casino-grade dice are precision-cut to ±0.0005 inches to eliminate this. Digital dice have no such bias.
Why am I seeing streaks of the same number?
Because that's what real randomness looks like. In 100 d6 rolls you'd typically see a streak of three or four matching numbers somewhere. Humans expect random sequences to alternate more than they actually do — this is the clustering illusion. If you rolled 100 dice and never saw any streaks, that would be statistically suspicious. The PRNG is fair; intuition is the unreliable part.
Can I roll non-standard dice like d3 or d100?
For d100 (percentile), roll a d10 twice and read tens-then-ones, or use the Random Number Generator with range 1-100. For d3, roll a d6 and divide by 2 rounded up (1-2 = 1, 3-4 = 2, 5-6 = 3) — many tabletop systems use this convention since true d3s are rare. For dice with non-power-of-two sides (d7, d14), the Random Number Generator with custom range is cleaner than improvising with d6/d8.
Is rolling multiple separate dice the same as rolling them at once?
Mathematically yes — each die is independent of the others, and the total is the same whether you roll them simultaneously or one at a time. But the Dice Roller's roll-all-at-once feature is faster and shows the sum automatically. For games where dice rolls happen as a batch (Yahtzee scoring, board game movement), one click does the whole turn. For sequential decisions (roll, then react, then roll again), use single-die rolls instead.
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