Free Custom Dice Roller
Select a value to instantly set all dice to the same type.
Die Types
Select your dice and click Roll Dice to get started
What This Tool Offers
This custom dice roll generator is an online dice simulator that allows you to roll up to fifteen dice, each with a distinct number of sides. Whether you need a multi dice roller for a board game, an RPG dice roller for tabletop adventures, or a dice probability tool for educational experiments, this flexible tool adapts to your needs. Simply specify the dice composition and let the virtual throw provide instant results.
How to Use the Dice Roll Generator
Using the custom dice simulator is straightforward:
- Select the number of dice – Choose between 1 and 15 dice to include in the roll.
- Set the dice types – If you want all dice to have the same face count, pick a single value from the "Set all dice types to" dropdown. For a mixed set, switch to the per‑die mode and assign each die its own number of sides (from over 20 different options, ranging from d4 to d20 and beyond).
- Perform the roll – Toggle the "Roll" checkbox to generate the dice outcomes. The tool instantly displays the result for each die, making it easy to analyze totals or specific combinations.
This online dice simulator updates dynamically, so you can adjust the dice configuration and re‑roll without reloading the page.
Understanding Dice Geometry
For dice to be fair, each face must have an equal probability of landing face up. The most common fair dice are based on regular polyhedra, also known as Platonic solids. The table below lists the standard dice shapes:
| Sides | Shape (Polyhedron) |
|---|---|
| 4 | Tetrahedron |
| 6 | Cube |
| 8 | Octahedron |
| 12 | Dodecahedron |
| 20 | Icosahedron |
The 10‑sided die, widely used in role‑playing games, is not a Platonic solid but a pentagonal trapezohedron – a polyhedron with kite‑shaped faces. Creating odd‑sided dice presents unique challenges. A true polyhedron with an odd number of faces cannot exist, so designers use workarounds: a 3‑sided effect can be achieved by using a cube with each of the numbers 1, 2, and 3 repeated twice. For other odd counts, prism shapes (two regular polygon ends with a desired number of rectangular sides) are common. In fact, even a classic 6‑sided die can be constructed as a cube, a prism, a trapezohedron, or a dipyramid – demonstrating that there is often more than one way to build a fair die.
Practical Applications
This custom dice roller serves multiple purposes. As a multi dice roller, it can accelerate game setup by eliminating manual sorting. RPG players can simulate complex dice pools for character creation or combat checks. Educators and students can use it as a dice probability tool to explore concepts such as expected value, variance, and experimental versus theoretical probability. For any scenario requiring random outcomes with custom ranges, this online dice simulator provides a convenient, no‑download solution.
Summary
With support for up to 15 dice and over 20 face types, the custom dice roll generator combines flexibility with ease of use. Whether you need a quick random number generator for a casual game or a dedicated RPG dice roller for a campaign session, this tool delivers instant, fair results.
FAQ
1. Can I roll different‑sided dice together in a single throw?
Yes. The tool lets you set each die individually, so you can mix d4, d6, d8, d10, d12, d20, and others in the same roll.
2. What is the maximum number of dice I can roll at once?
You can roll up to fifteen dice simultaneously in this custom dice roller.
3. What shapes are used for standard dice?
The most common dice (4‑, 6‑, 8‑, 12‑, and 20‑sided) are based on Platonic solids: tetrahedron, cube, octahedron, dodecahedron, and icosahedron. The 10‑sided die is a pentagonal trapezohedron.
4. Can I use this online dice simulator for probability experiments?
Yes. You can use it as a dice probability tool to test theoretical probabilities by comparing expected outcomes with actual results across many rolls.
How to Use
- Choose how many dice you want to roll (1 to 15) using the Number of Dice dropdown.
- Set each die's number of sides individually, or use the "Set All Dice Types To" dropdown for quick setup.
- Click the Roll Dice button to generate random results and instantly see each die outcome plus the total sum.