How are dice results generated?

Each die uses Math.random() × sides, giving each value equal probability. A d6 has exactly 1/6 chance for each result (1-6).

Can I roll dice for D&D or tabletop RPGs?

Absolutely! Use d4, d6, d8, d10, d12, and d20 for D&D. Add a modifier (+ bonus) for attack rolls and skill checks.

Are the dice rolls fair and unbiased?

Yes. Each die uses the Web Crypto API with rejection sampling, so every face has exactly equal probability — a true one-in-six for a d6. There is no weighting toward any number, unlike a worn physical die.

Can I roll dice notation like 3d6+2?

Yes. Set the die type, the number of dice, and a modifier. The tool rolls each die separately and shows the individual results plus the total, matching standard tabletop dice notation.

What does rolling with advantage do?

In D&D 5e, advantage rolls two d20 and keeps the higher result, raising the average from 10.5 to about 13.8. Disadvantage keeps the lower. The advantage and disadvantage toggles handle both automatically.

Can I roll percentile dice (d100)?

Yes. Select d100 for a single 1–100 result, used for random tables, loot drops, and wild-magic effects. It is equivalent to rolling two d10 (tens and units) together.

How many dice can I roll at once?

You can roll large batches simultaneously to compare totals or visualise probability distributions. Rolling many dice is useful for testing average damage output or seeing the bell curve of multiple-dice sums.

Can I roll dice against friends online?

Yes. Use "Play with friends" to open a Multiplayer Dice room and share the link. Each player gets one seeded roll, the highest total wins, and everyone sees the same fair results. It is free, instant, and runs in any browser without an account.

Are the multiplayer dice rolls fair?

Yes. Each player's roll is derived from the shared room seed, so the outcome is reproducible and cannot be secretly re-rolled. Everyone can trust the result, which makes it handy for settling bets or deciding turn order remotely.

Dice Roller — Roll Any Dice

How to use Dice Roller

Roll virtual dice for any tabletop RPG, board game, or probability exercise — supports every standard die type (d4, d6, d8, d10, d12, d20, d100) as well as custom-sided dice. Roll multiple dice simultaneously, add modifiers, keep highest or lowest rolls (advantage/disadvantage), and see the full probability distribution. Results use the Web Crypto API for fair, unbiased rolls.

Select the die type: d4, d6, d8, d10, d12, d20, d100, or enter a custom number of sides.
Set how many dice to roll simultaneously (e.g., 3d6 for a D&D ability score).
Add a modifier (+ or −) to the total if required by your game system.
Toggle "Advantage" to roll twice and keep the highest, or "Disadvantage" to keep the lowest.
Click Roll and see the individual die results, total, and roll history.

Your data never leaves your device — 100% private processing.

Standard polyhedral dice and their uses

Tabletop RPGs like Dungeons & Dragons use a set of standard polyhedral dice. The d20 is the core resolution die for attacks and skill checks. The d6 is used for damage and ability score generation (roll 4d6, drop lowest). The d4, d8, d10, d12 determine weapon damage by type — a dagger deals 1d4, a longsword 1d8, a greataxe 1d12. The d100 (or d% using two d10s) handles percentage-based tables. The d10 (0–9 and 00–90) generates percentile results when paired.

Die	Range	Common use
d4	1–4	Light weapon damage (dagger, dart)
d6	1–6	Ability scores, standard damage
d8	1–8	Medium weapon, healing potions
d10	1–10	Heavy weapon, percentile tens
d12	1–12	Greataxe damage, bardic inspiration
d20	1–20	Attack rolls, saving throws, skill checks
d100	1–100	Random tables, loot, wild magic

Advantage and disadvantage mechanics

D&D 5e introduced the advantage/disadvantage system as a streamlined probability modifier. Advantage (roll 2d20, keep highest) shifts the effective average from 10.5 to 13.8. Disadvantage (roll 2d20, keep lowest) drops it to 7.2. This is equivalent to approximately +3.3 or −3.3 to the roll, making it a significant but not overwhelming modifier — more elegant than the older +2/−2 flat bonus system. Multiple sources of advantage or disadvantage don't stack; you roll at most two dice regardless.

Play Multiplayer Dice with friends

This dice roller doubles as a quick Multiplayer Dice game. Pick "Play with friends", create a room, and share the code — every player gets one seeded roll and the highest total wins the round. Because each roll comes from the shared room seed, results are reproducible and tamper-proof, so there is no arguing over a "lucky" reroll. It is a free, browser-based way to settle a bet, pick who goes first, or run a fast dice contest with friends and family anywhere. No app, no sign-up, just share a link. Find more shared-randomness games on the multiplayer games hub.

Worked examples

Roll 2d6

Inputs: 2 six-sided dice

Result: sum of 7 is most likely: 6/36 ≈ 16.7%

Roll with advantage

Inputs: 2d20, keep highest

Result: average rises from 10.5 to about 13.8

Glossary

Polyhedral dice: Multi-sided dice with 4, 6, 8, 10, 12, 20, or 100 faces used in tabletop role-playing games.
Modifier: A fixed number added to or subtracted from a die roll result, representing character ability bonuses.
Advantage: A D&D 5e mechanic where you roll two dice and take the higher result, increasing the probability of success.
Critical hit: Rolling a natural 20 on a d20 attack roll, resulting in double damage dice in D&D 5e.

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Dice Roller

How to use Dice Roller

Standard polyhedral dice and their uses

Advantage and disadvantage mechanics

Play Multiplayer Dice with friends

Worked examples

Glossary

Related reading

Frequently Asked Questions

Why use Dice Roller?

Common use cases

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