Custom Dice Roller Calculator

Roll up to 15 custom dice with any number of sides using the Custom Dice Roller Calculator. Set the number of dice (1–15) and the number of sides per die (up to 120), then hit Roll to see each individual die result, the total sum, and the average roll. Perfect for tabletop RPGs, board games, or any scenario where standard 6-sided dice just won't cut it.

Choose how many dice to roll (1–15)

Enter any value from 2 to 120 sides

Pick a common die type to auto-fill sides, or choose Custom

Add or subtract a flat modifier from the total (e.g. +5 or -2)

Useful for D&D ability score generation

Results

Total Roll Result

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Dice Rolled

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Average per Die

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Minimum Possible

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Maximum Possible

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Individual Die Results

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Individual Die Results

Results Table

Frequently Asked Questions

How random are the dice rolls in this calculator?

This calculator uses JavaScript's Math.random() function, which produces pseudo-random numbers. While not cryptographically random, it is more than random enough for tabletop games, D&D, and general use. Each roll is independently generated, just like a physical die.

What is the maximum number of dice and sides I can roll?

You can roll up to 15 dice at once, each with up to 120 sides. This covers everything from standard D4, D6, D8, D10, D12, and D20 dice all the way to exotic custom dice used in specialty games.

What are the most common types of dice used in tabletop games?

The seven standard dice used in tabletop RPGs like Dungeons & Dragons are the D4, D6, D8, D10, D12, D20, and D100 (percentile). Each corresponds to a specific geometric shape — for example, the D6 is a cube and the D20 is an icosahedron.

How many dice shapes (geometrical forms) are there?

There are five classic Platonic solids used for dice: tetrahedron (D4), cube (D6), octahedron (D8), dodecahedron (D12), and icosahedron (D20). Beyond these, many other shapes like pentagonal trapezohedra (D10) and Zocchihedra (D100) are also used in gaming.

What does the 'Drop Lowest Die' option do?

When enabled, the lowest single die result is removed before summing the total. This is a common rule in D&D ability score generation, where you roll 4D6 and drop the lowest to get more favorable results.

What is a roll modifier and how does it work?

A roll modifier is a flat number added to (or subtracted from) your total dice result. For example, rolling 2D6 with a +3 modifier means your total is the sum of both dice plus 3. Modifiers are commonly used in RPGs to reflect a character's skills or attributes.

Can I use this calculator for Dungeons & Dragons?

Absolutely. This calculator supports all standard D&D dice types (D4, D6, D8, D10, D12, D20) along with modifiers and the drop-lowest option. You can simulate ability score rolls, attack rolls, damage rolls, and saving throws all in one place.

What is the average result I should expect from rolling NdX dice?

The expected average of a single die with X sides is (X + 1) / 2. For multiple dice, multiply by the number of dice. For example, rolling 3D6 has an average result of 3 × 3.5 = 10.5. This calculator shows the average per die alongside your actual roll.

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