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Dice Roller

Roll any standard tabletop dice - D4, D6, D8, D10, D12, D20, D100 - or set a custom die. Roll multiple dice and see individual results with totals.

Select Die Type

About Dice Roller — Dice Roller Online

The Oneyfy dice roller online simulates all standard tabletop RPG dice — D4, D6, D8, D10, D12, D20, and D100 — and lets you roll multiple dice simultaneously with a single click. Results are generated using the browser's cryptographic random number generator for genuinely unpredictable outcomes. A roll history tracks your last 20 rolls for the session, and a custom die option lets you roll any number of sides from 2 to 10,000.

A dice roller online is useful whenever physical dice aren't available: during a digital tabletop RPG session, when playing a board game over video call, in a classroom for probability demonstrations, or simply when you need a fair random number within a specific range. Dungeon Masters use it to run encounters remotely, game designers use it for rapid playtesting without a physical prototype, and teachers use it to make probability lessons interactive.

How to Use the Dice Roller

  1. Click one of the die type buttons — D4, D6, D8, D10, D12, D20, or D100 — to select which die to roll. The active die is highlighted.
  2. To roll a non-standard die, enter the number of sides in the Custom die field and click Use Custom.
  3. Set the Number of dice field to roll multiple dice at once (from 1 to 100).
  4. Click the Roll button (or press Enter when not typing in an input field) to roll.
  5. The large number shows the total; individual die results appear below, with maximum rolls highlighted in blue and minimum rolls highlighted in red.
  6. The Roll History section tracks your last 20 rolls so you can review previous results during a session.

Standard Dice — What Each Die Is Used For

Each standard polyhedral die has a conventional role in tabletop RPG systems, board games, and probability applications.

  • D4 (4-sided tetrahedron): Used for small damage rolls in D&D such as daggers and magic missiles. Also common in lighter board games and for generating numbers 1–4.
  • D6 (standard cube): The most familiar die, used in virtually every board game. In D&D, used for hit dice (rogues, sorcerers), sneak attack damage, and many other rolls.
  • D8 (8-sided octahedron): Common for weapon damage (longswords, war picks) in D&D and Pathfinder. Hit dice for clerics and rangers.
  • D10 (10-sided): Used for percentile rolls when paired with another D10 (tens digit + units digit = 1–100). Also the hit die for fighters and paladins.
  • D12 (12-sided): Used for large two-handed weapons like greataxes in D&D. The barbarian's hit die. Rare in board games but common in RPG systems.
  • D20 (20-sided icosahedron): The iconic attack roll, saving throw, and skill check die in D&D 5e. A natural 20 is a critical hit; a natural 1 is a critical failure.
  • D100 (percentile die): Represents a 1–100 outcome, used in systems like Call of Cthulhu and for wild magic surges in D&D. Equivalent to rolling two D10s for tens and units.

Tips for Getting the Best Results

A few features make the dice roller more useful during actual play sessions.

  • Roll multiple dice for damage: For a spell or ability that deals 3D6 damage, select D6, set Number of dice to 3, and click Roll. The total and all three individual results appear at once — equivalent to picking up three physical dice simultaneously.
  • Use the custom die for unusual systems: Some RPG systems use non-standard dice like D3, D7, or D30. Enter the number of sides in the Custom die field and click Use Custom to simulate any die type beyond the standard seven.
  • Watch for highlighted results: Maximum rolls (e.g., a 20 on a D20) appear with a filled blue background. Minimum rolls (a 1) appear with a red border. These visual cues help you spot critical successes and failures instantly during fast-paced play.
  • Use roll history to verify: The roll history shows the last 20 rolls in full notation (e.g., "3D6: [4, 2, 6] = 12"). This is useful for resolving disputes about what was rolled earlier in a session without relying on memory.
  • Press Enter to roll quickly: When the focus is not inside a text field, pressing Enter triggers a new roll of the same die configuration. This speeds up combat rounds where you're rolling the same dice repeatedly.

Why Use a Dice Roller Online

A browser-based dice roller works on any device — laptop, tablet, or phone — without installing an app. It requires no Bluetooth, no battery, and no physical dice rolling off the table. Since results use the Web Crypto API's cryptographic random number generator rather than the weaker Math.random(), outcomes are as statistically fair as a physical die roll. No data is sent to any server.

Tabletop RPG players benefit most during online sessions via video call when physical dice aren't visible to other players. Game masters can roll behind the screen without suspicion of cheating by sharing roll history. Teachers find it useful for probability and statistics lessons where the class can see each roll result on a shared screen. Board game enthusiasts use it as a backup when dice go missing.

Frequently Asked Questions about Dice Roller

Results are generated using the Web Crypto API's crypto.getRandomValues(), which produces cryptographically strong random numbers. This is far more statistically uniform than Math.random(), which uses a pseudo-random algorithm that can produce subtle patterns over large samples. For tabletop gaming purposes, this means the roller is as fair as a well-made physical die — no result is more likely than any other.
Yes — set the "Number of dice" field to any value up to 100. All individual results are shown alongside the total. For example, rolling 10D6 for a fireball spell shows all ten individual die results and their sum. Each die in the batch is rolled independently, so the results reflect the full probability distribution of multiple dice rather than a single roll multiplied.
Yes. Enter the number of sides in the Custom die field (minimum 2, maximum 10,000) and click Use Custom. The custom die selector deactivates all standard die buttons and uses your custom side count for all subsequent rolls. This is useful for non-standard RPG systems, probability experiments, and random selection from a specific number of options.
Yes, completely free. No account, no sign-up, and no limits on the number of rolls. The roller works entirely in your browser with no server communication, so it is also available offline once the page has loaded — useful during tabletop sessions where internet connectivity may be unreliable.
Yes. The dice roller is fully functional on mobile browsers including Safari on iOS and Chrome on Android. The die selection buttons and Roll button are sized for touch interaction. You can use it on a phone or tablet during a tabletop session where a laptop isn't practical.
The roll history stores the last 20 rolls for the current browser session. The history is kept in memory only and is cleared when you click the Clear button or close the browser tab. It is not saved to local storage or transmitted anywhere, so each new browser session starts with a fresh empty history.
Individual die results are highlighted to draw attention to extreme values. A result equal to the maximum possible value (e.g., 20 on a D20) gets a filled blue background — a critical hit indicator. A result of 1 (the minimum) gets a red border — a critical failure indicator. These match the visual conventions most tabletop players are familiar with from digital RPG tools.
Absolutely. The D6 is the standard board game die, and rolling multiple D6s covers the vast majority of board game dice needs. Games like Catan (2D6 for production), Monopoly (2D6 for movement), Yahtzee (5D6), and Risk (up to 3D6 for attack and 2D6 for defence) are all supported by setting the count and clicking Roll.