Free Online Dice Roller & 3D Tray
Engineered for Fair Tabletop Play
The Spinwheelify Dice Roller replaces physical polyhedral sets with true cryptographically secure randomness (CSPRNG via crypto.getRandomValues). Unlike low-entropy standard pseudo-random functions, our engine guarantees zero mechanical bias, zero micro-weight imperfections, and uniform probability distributions across every face.
Designed for both veteran Dungeon Masters and casual party gamers, the tray supports full D&D 5e Advantage and Disadvantage resolution, character stat generation (4d6 drop lowest), and traditional precision-grade D6 dot pips alongside polyhedral geometric silhouettes.
Running a party game or bluffing contest? Switch on Blind Cup Mode to roll in secret under an opaque shaker cup. Hold to peek at your own score, or lift the cup to reveal the outcome to the whole table. Need to decide turn order or choose who rolls first? Pick players randomly with our wheel of names before diving into the campaign.
Mathematical Probability Breakdown
Theoretical odds and distribution curves for standard dice combinations.
🎲2D6 Sum Probability (36 Combinations)
| Sum | Combinations | Odds | Percentage |
|---|---|---|---|
| 2 | (1,1) | 1/36 | 2.78% |
| 3 | (1,2), (2,1) | 2/36 | 5.56% |
| 4 | (1,3), (2,2), (3,1) | 3/36 | 8.33% |
| 5 | (1,4), (2,3), (3,2), (4,1) | 4/36 | 11.11% |
| 6 | (1,5), (2,4), (3,3), (4,2), (5,1) | 5/36 | 13.89% |
| 7 (Peak) | 6 ways (1-6..6-1) | 6/36 | 16.67% |
| 8 | 5 ways | 5/36 | 13.89% |
| 9 | 4 ways | 4/36 | 11.11% |
| 10 | 3 ways | 3/36 | 8.33% |
| 11 | 2 ways | 2/36 | 5.56% |
| 12 | (6,6) | 1/36 | 2.78% |
⚔️D&D 5e: Advantage vs Normal vs Disadvantage
| Target DC | Disadvantage | Normal | Advantage |
|---|---|---|---|
| Roll Result ≥ 10 | 30.25% | 55.00% | 79.75% |
| Roll Result ≥ 15 | 9.00% | 30.00% | 51.00% |
| Average Score | 7.18 | 10.50 | 13.82 |
| Critical Hit (Nat 20) | 0.25% | 5.00% | 9.75% (~2x) |
Polyhedral Dice Reference (D4 to D100)
When and why tabletop RPG systems employ each specific polyhedral geometry.
Party & Drinking Games Guide
Rules and setups for Liar's Dice, Sic Bo, and casual board games.
🍻 Liar's Dice (Bluffing Game)
5D6 / Player- Each player rolls 5D6 secretly using Blind Cup Mode on their device.
- Shake in secret, hold "Peek" so only you know your dice values.
- Take turns bidding on the total face count across all players (e.g., "Six fives").
- Face 1 is typically wild. The next player must bid higher or challenge by lifting the cup!
🏮 Sic Bo (Big & Small)
3D6 Dice- Use the 3D6 Blind Cup preset to keep rolls hidden until revealed.
- Total score from 4 to 10: Result is XỈU / UNDER (Small).
- Total score from 11 to 17: Result is TÀI / OVER (Big).
- All three dice showing the same face (e.g., triple 4s): Result is BÃO (Triple).
How to Roll Like a Pro
Pick Your Die Geometry
Select from D4, D6, D8, D10, D12, D20, or D100. Toggle between traditional D6 dots (pips) and numerical faces.
Apply Rules & Modifiers
Toggle D&D 5e Advantage or Disadvantage, assign static attack/damage bonuses, or drop outlier rolls automatically.
Roll & Track Distribution
Hit [Space] to roll with physical clatter audio. Monitor real-time roll distribution histograms in the session stats tab.
Dice Rolling FAQ & Technical Details
How does Spinwheelify guarantee 100% fair rolls?
Every roll is generated through the browser's native crypto.getRandomValues() API (CSPRNG). This uses hardware-level environmental entropy instead of Math.random(), eliminating predictable seed cycles and statistical clustering.
How do D&D 5e Advantage and Disadvantage mathematically affect odds?
Rolling with Advantage rolls two D20s and takes the highest value. This raises your chance of landing a Natural 20 from 5.0% to 9.75%, and pushes your average roll from 10.5 up to 13.82. Disadvantage reverses this curve, lowering a Nat 20 chance to just 0.25%.
How do I roll for D&D ability scores (4d6 drop lowest)?
Click the '4D6 Drop Lowest' preset or set Quantity to 4, Keep/Drop to 'Drop Lowest' with count 1. The roller rolls four six-sided dice, strikes through the lowest single value, and sums the remaining three.
What is Blind Cup Mode and how do I use it for party games?
Blind Cup Mode hides the rolled dice under an opaque shaker cup. You can hold the 'Hold to Peek' button to check your dice privately (perfect for Liar's Dice), or click 'Open Cup' to reveal the result to everyone simultaneously.
Can I roll using custom dice notation like '3d8+4'?
Yes. Type any standard dice formula into the Direct Dice Notation input (e.g., 2d20+5, 8d6, 1d100+10) and press Enter to parse and roll immediately.
What is the most common result when rolling two six-sided dice (2D6)?
The number 7 is the most probable outcome with 6 out of 36 combinations (16.67% probability). Extremes like 2 and 12 have only a 1 in 36 chance (2.78% each).
Is there a keyboard shortcut for rapid rolling?
Yes, tap the [Spacebar] or [Enter] key on your keyboard to instantly roll the active configuration without clicking.
Can I copy the roll breakdown to character sheets or Discord?
Yes. Every roll generates a copy button that exports a formatted string including formula, individual dice outcomes, modifiers, and final total directly to your clipboard.