RandomVirtual Dice Roller
Free online dice roller with D4-D100, D&D advantage/disadvantage, modifiers (4d6+2), stats and history. Provably fair crypto.getRandomValues rolls.
Advantage rolls each die twice and keeps the highest; Disadvantage keeps the lowest. Classic D&D 5e mechanic.
Flat number added to the total (e.g. +5 attack bonus, -2 to hit). Range: -50 to +50.
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Roll History| # | Dice | Values | Total | Time |
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Tips & Info
- Choose between 1-6 dice and various dice types (D4, D6, D8, D10, D12, D20, D100)
- Your roll history is automatically saved in your browser (last 50 rolls)
- Perfect for tabletop RPGs like D&D, Pathfinder, board games, and decision making
- D6 dice show traditional dots, while other dice types display numbers
Have feedback? Report bugs, suggest features, or share your thoughts — we read them allWhat is a Virtual Dice Roller?
A virtual dice roller is an online tool that simulates rolling physical dice. Our dice roller supports all standard polyhedral dice used in tabletop role-playing games (RPGs) and board games, including D4, D6, D8, D10, D12, D20, and D100. You can roll multiple dice at once, and the tool automatically calculates the total sum. With comprehensive statistics tracking and roll history, it's perfect for D&D campaigns, Pathfinder sessions, board games, or any situation where you need random number generation. Try also our Sudoku and Bubble Wrap.
Key Features
- Support for all standard dice types: D4, D6, D8, D10, D12, D20, and D100
- Roll 1-6 dice simultaneously with automatic sum calculation
- Realistic 3D rolling animation for immersive experience
- Visual dots for D6 dice (traditional dice face), numbers for other types
- Instant results with clear breakdown of individual dice values
- Comprehensive statistics: total rolls, average, highest, and lowest
- Detailed roll history showing last 50 rolls with timestamps
- Auto-save feature - settings and history persist in your browser
- Sound effects for enhanced gaming experience
- Fully responsive - works on desktop, tablet, and mobile
- No registration required - start rolling immediately
- Completely free with unlimited rolls
How to Use the Virtual Dice Roller
- Select the number of dice you want to roll (1-6 dice)
- Choose the type of dice by selecting the number of sides (D4, D6, D8, D10, D12, D20, or D100)
- Click the 'Roll Dice' button to roll your selected dice
- Watch the dice animate as they roll
- View the total sum and individual dice values in the result display
- Check the Statistics section to see your rolling patterns
- Review the History table to see all your previous rolls
- Change dice settings anytime to roll different dice combinations
- Click 'Reset History' to clear all data and start fresh
Common Use Cases
- Dungeons & Dragons (D&D) - roll for attacks, damage, ability checks, and saving throws
- Pathfinder and other tabletop RPGs
- Board games requiring dice rolls
- Educational purposes - teaching probability and statistics
- Random number generation for decision making
- Online gaming sessions when physical dice aren't available
- Testing dice probabilities and distributions
- Game development and playtesting
- Wargaming and miniature games
- Quick random selections and fair choices
Dice Types Explained
- D4 (4-sided die) - Pyramid shape, commonly used for small damage rolls
- D6 (6-sided die) - Standard cube dice, most common in board games and some RPG damage
- D8 (8-sided die) - Octahedron shape, medium damage weapon rolls
- D10 (10-sided die) - Pentagonal trapezohedron, used in percentile rolls and some game systems
- D12 (12-sided die) - Dodecahedron shape, large weapon damage in D&D
- D20 (20-sided die) - Icosahedron, the iconic D&D die used for most checks and attacks
- D100 (100-sided die) - Zocchihedron or percentile dice, used for rare random tables
Frequently Asked Questions
Every roll uses your browser's cryptographically secure random generator, crypto.getRandomValues, rather than the ordinary Math.random. To eliminate modulo bias (the subtle skew that happens when a random range does not divide evenly), we apply rejection sampling: any value that would land in the lopsided tail is discarded and re-drawn. The result is a uniform, unbiased outcome where no face is favored over another — the same fairness as a perfectly balanced physical die, and better than most casino dice. For tabletop gaming, party games, or casual decision-making this is more than sufficient. True hardware entropy (radioactive decay, thermal noise) is only needed for cryptography or scientific simulations, not for your D&D campaign or a quick dinner-choice roll.
Simply set the dice count to the number you want to roll — 2 for classic Yahtzee dice, 3 for many board games, or up to several dozen for large dice-pool systems like Shadowrun or World of Darkness. The tool rolls each die independently and shows individual results plus the total sum. You can also mix die types (d4, d6, d8, d10, d12, d20, d100) for tabletop RPGs that use varied dice. For Dungeons & Dragons damage rolls like 4d6+2, set count to 4, type to d6, and add the modifier to the displayed total.
The letter d stands for die, and the number indicates the number of sides. A d6 is a standard six-sided cube, the kind found in Monopoly and Yahtzee. A d4 is a tetrahedron (pyramid), d8 an octahedron, d10 a pentagonal trapezohedron, d12 a dodecahedron, and d20 an icosahedron. The d100 is special — it can be a true 100-sided sphere-like die, but more commonly it is rolled as two d10s where one represents tens (00, 10, 20...90) and the other represents ones (0-9). Together they give a result from 1 to 100, used in percentile-based RPG systems like Call of Cthulhu and old-school Warhammer.
Yes — the tool supports all standard polyhedral dice (d4, d6, d8, d10, d12, d20, d100) used in Dungeons & Dragons, Pathfinder, Call of Cthulhu, and most tabletop RPGs. You can roll any quantity from 1 die up to a full dice pool, useful for systems like Shadowrun (large d6 pools), World of Darkness (d10 pools), and Warhammer 40k (massive d6 attacks). For more exotic dice not natively supported (d3, d7, d30), you can use a d6 and divide, or roll a larger die and reroll out-of-range results. The roll history lets you track sequences across an entire combat encounter or skill challenge.
Polyhedral dice as we know them entered popular culture through Dungeons & Dragons, co-created by Gary Gygax and Dave Arneson and published by TSR in 1974. The original game shipped with cheap soft plastic dice that wore down quickly. Before D&D, the five Platonic solids had been studied since antiquity — Plato wrote about them in Timaeus around 360 BCE, associating each with a classical element. Ancient knucklebones (astragali) and four-sided dice have been found in archaeological digs dating back over 5,000 years to Mesopotamia and ancient Egypt. The 20-sided die specifically appears in Roman and Ptolemaic Egyptian artifacts long before any gaming application, possibly used for divination or letter-based oracles.
Surprisingly, yes — researchers in decision theory have found that for decisions where you genuinely cannot choose between two roughly equal options, randomization breaks the deadlock efficiently and often reveals your true preference. The economist Steven Levitt ran a famous 2016 study where people facing major life decisions (quit a job, end a relationship, move cities) flipped a coin and committed to the outcome; six months later, those who made the change reported higher happiness on average. The lesson is not that dice are wiser than you, but that overthinking small or balanced choices is a tax on your time. Use dice for restaurant picks, movie nights, and chore assignments — save deliberation for high-stakes irreversible decisions.
Math.random in modern browsers uses an algorithm called xorshift128+ or a similar fast PRNG (pseudo-random number generator), seeded from system entropy when the page loads. It is fast, statistically uniform for most purposes, but predictable if an attacker observes enough output — unsuitable for cryptography or gambling. crypto.getRandomValues uses the operating system's cryptographically secure random source (CSPRNG), which mixes hardware entropy with cipher-based generators. It is slower but produces output indistinguishable from true randomness even against sophisticated attackers. For dice rolls, the visual feedback is identical, but using crypto.getRandomValues guarantees that no clever observer could predict your next roll from previous ones — overkill for D&D, essential for online poker.
The Mersenne Twister, developed by Makoto Matsumoto and Takuji Nishimura in 1997, is the most widely used PRNG in scientific computing — Python, R, MATLAB, PHP's mt_rand, and many game engines use it. Its period (the length before the sequence repeats) is 2^19937 − 1, an astronomically large number meaning you could draw a billion values per second for billions of years without repeating. It passes most statistical randomness tests but fails some (Diehard, TestU01 BigCrush) and is not cryptographically secure — if you observe 624 consecutive outputs, you can predict all future ones. For dice simulations and Monte Carlo physics, Mersenne Twister is excellent; for security-critical randomness, use crypto.getRandomValues or a CSPRNG like ChaCha20.
Yes — the dice roller is completely free with unlimited rolls, no registration, no account, and no ads interrupting your game. Everything runs entirely inside your browser using JavaScript, so once the page has loaded it keeps working even if your internet connection drops. That makes it reliable at a friend's house with spotty Wi-Fi, on a train, or during a convention where the network is overloaded. There are no server calls for the rolls themselves: when you press Roll, your own device's secure random generator produces the result instantly.
Completely. Your roll history, statistics, and dice settings are stored only in your own browser using localStorage — they never leave your device and are never sent to our servers or any third party. We cannot see your rolls and no analytics are tied to them. Because the data lives locally, your last 50 rolls persist across tabs and browser restarts on the same device, but they will not follow you to a different computer or phone. To wipe everything instantly, click Reset History, or clear your browser's site data.
Set the D&D 5e Mode to Advantage and the tool rolls each die twice and keeps the higher result; choose Disadvantage and it keeps the lower — exactly the official D&D 5e mechanic. The discarded die is shown in the breakdown and history so you can verify it. To add a flat bonus such as a +5 attack modifier or a -2 penalty, type it into the Modifier field; it is added to the dice total automatically (for example, a d20 in Advantage mode with +5 shows the kept die plus 5). To roll a damage expression like 4d6+2, set dice count to 4, dice type to D6, modifier to +2, and roll.
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