How to Roll Dice Online in 3 Simple Steps
Pick Your Dice
Tap any polyhedral chip (d4, d6, d8, d10, d12, d20, d100) or tap ⚙ to enter a custom side count.
Set Count & Modifiers
Use the + and − steppers to roll multiple dice at once, or type expressions like 2d6+3 into the notation field.
Roll & Check Total
Press the prominent Roll Dice button, hit the Spacebar, or tap the dice on screen to see your animated result instantly.
Supported Polyhedral Dice and Their Uses
From ancient games of chance to modern tabletop roleplaying systems, polyhedral dice represent different mathematical ranges. Below is a reference of the standard dice supported by our simulator:
| Die | Geometric Shape | Number Range | Common Applications |
|---|---|---|---|
| d4 | Tetrahedron (4 faces) | 1 – 4 | Daggers, small healing vials, Magic Missile |
| d6 | Cube (6 faces) | 1 – 6 | Monopoly, Catan, Yahtzee, shortswords, Fireball |
| d8 | Octahedron (8 faces) | 1 – 8 | Longswords, Cure Wounds, martial arts |
| d10 | Pentagonal Trapezohedron | 1 – 10 (or 0–9) | Heavy polearms, Eldritch Blast, percentile units |
| d12 | Dodecahedron (12 faces) | 1 – 12 | Greataxes, Barbarian hit points, monster attacks |
| d20 | Icosahedron (20 faces) | 1 – 20 | Core d20 checks, attack rolls, saving throws |
| d100 | Percentile Die | 1 – 100 | Loot tables, Wild Magic surges, Call of Cthulhu |
Dice Notation Cheat-Sheet
Standard tabletop notation lets you execute complex formulas in a concise string. You can type any of the following expressions directly into the notation input:
2d6+3: Roll two 6-sided dice and add 3 to the total.1d20+7: Roll a single 20-sided die with a +7 attack bonus.4d6kh3: Roll four 6-sided dice and keep the highest 3 (standard ability score generation).2d20kh1ord20 adv: Roll with Advantage (two d20s, keep highest).2d20kl1ord20 dis: Roll with Disadvantage (two d20s, keep lowest).2d6 + 1d4 + 2: Multi-term roll summing different polyhedral dice.
Is This Dice Roller Truly Fair?
Physical plastic dice frequently have hidden internal bubbles, rounded corners, or weight imperfections that cause them to favor specific numbers over time. In contrast, diceroller.fun utilizes a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG) powered by the browser's native Web Crypto API.
Unlike basic online randomizers that rely on linear congruential generators or biased modulo arithmetic, our engine employs rejection sampling. This guarantees that each face has an exact, mathematically identical probability of landing. Read our full technical explanation on the fairness page.
Popular Ways to Use an Online Dice Roller
While many players and students start with a simple Google dice roller in search results, diceroller.fun delivers a dedicated game-feel upgrade with authentic 3D physics, full polyhedral sets, custom notation, and persistent roll history.
Tabletop Roleplaying Games
When playing D&D, Pathfinder, or Call of Cthulhu remotely over Discord or Roll20, roll transparently with full breakdown history and advantage toggles.
Family Board Games
Lost the dice for Catan, Yahtzee, or Monopoly? Fire up the 3D dice stage on your phone or tablet and keep game night rolling without missing a beat.
Classroom Mathematics
Demonstrate experimental probability, sample space, and the Law of Large Numbers by rolling batches of dice and viewing real-time distribution stats.
Impartial Decision Making
Can't agree on which restaurant to visit, who goes first, or which board game to play? Assign numbers and let a quick toss make the impartial choice.
Frequently Asked Questions
What is an online dice roller and how does it work? ↓
An online dice roller is a digital tool that simulates rolling physical dice using software algorithms. Unlike mechanical dice that rely on physical throws, modern online dice rollers use a cryptographically secure random number generator (CSPRNG via the browser’s Web Crypto API) to instantly generate unbiased numbers between 1 and the die’s total sides without any physical or mechanical flaws.
How do I roll fair dice online? ↓
To roll truly fair dice online, verify that your roller uses cryptographic randomness with rejection sampling rather than basic Math.random(). Common problems with cheap dice rollers include modulo bias (where lower numbers appear more often) and predictable seeds. diceroller.fun uses cryptographic rejection sampling, ensuring every side of every die has an exact, mathematically identical probability of landing.
What are the 7 standard types of tabletop dice? ↓
The 7 classic polyhedral dice used in tabletop gaming (such as Dungeons & Dragons, Pathfinder, and Call of Cthulhu) are: d4 (tetrahedron), d6 (standard cube), d8 (octahedron), d10 (pentagonal trapezohedron), d12 (dodecahedron), d20 (icosahedron), and d100 (percentile pair). All 7 standard dice are supported on diceroller.fun with one-click quick rolls.
How likely is a 7 on a dice roll (2d6)? ↓
Rolling a 7 is the single most probable outcome when rolling two standard six-sided dice (2d6). There are 6 different combinations that total 7 (1+6, 2+5, 3+4, 4+3, 5+2, 6+1) out of 36 possible outcomes. This produces a mathematical probability of 6/36 (1/6 or ~16.67%), which is why 7 is the central trigger number in popular board games like Settlers of Catan and Craps.
What is the hardest number to roll with two dice? ↓
The hardest and rarest numbers to roll with two standard six-sided dice are 2 (“snake eyes”) and 12 (“boxcars”). Each has only 1 combination out of 36 (1+1 and 6+6), resulting in odds of 1 in 36 (~2.78%). By comparison, a 7 is six times more likely to appear than a 2 or a 12.
Can I roll multiple dice or add custom modifiers (like 2d6+3 or 4d6kh3)? ↓
Yes. Use the count steppers (+ and −) to roll up to 100 dice simultaneously, or type expressions directly into the notation box. Our notation evaluator supports standard tabletop syntax including modifiers (e.g. 2d6+3), keep-highest ability rolls (e.g. 4d6kh3), and advantage/disadvantage toggles (d20 adv).
How does this compare to the Google dice roller in search? ↓
While many players search for the quick Google dice roller widget in search results, diceroller.fun is an independent tabletop gaming tool built for authentic gameplay. We provide significant game-feel upgrades: genuine 3D animated physics, procedural dice clatter sound effects, custom side counts (d2 to d1000), critical hit celebrations, and persistent roll history that works offline.
Can I use this online dice roller offline on my mobile phone? ↓
Yes! diceroller.fun is engineered as a mobile-first Progressive Web App (PWA) with zero battery drain, touch-friendly haptics, and instant offline loading. You can add it directly to your phone's home screen and roll dice anytime without an active internet connection.
Explore Related Dice Rollers
Roll twenty-sided dice with one-click advantage and disadvantage checks.
Complete polyhedral suite for tabletop RPGs with attack and stat presets.
Classic six-sided cube with 3D animation for family board games.
Configure dice with any custom number of sides from 2 to 1000.
Inspect exact mathematical odds, combinations, and bell curves.
Discover how our CSPRNG rejection-sampling engine guarantees zero bias.