Dice Roller

How to Use the Dice Roller

Tap any die button to add it to your roll. Tap d20 once for a single d20. Tap d6 three times for 3d6. Use the modifier field to add or subtract a flat number from the total. Click Roll to see the result.

The preset buttons cover d4, d6, d8, d10, d12, d20, and d100. These are the 7 standard die types used in most tabletop roleplaying games.

The tool shows each individual die result and the total sum. You can see whether any single die was a natural 1 or a maximum value. The Recent Rolls panel keeps your last 5 rolls so you can reference them without scrolling back.

Standard Die Types Explained

d4. Four sides. Used for small weapon damage like daggers and darts. Results: 1, 2, 3, or 4.

d6. Six sides. The most common die in the world. Used in Dungeons and Dragons, board games, and hundreds of other tabletop games.

d8. Eight sides. Used for mid-range weapon damage and some character hit dice.

d10. Ten sides. Used for heavy weapon damage and in percentile rolls alongside a second d10.

d12. Twelve sides. One of the least used standard dice, but important for greataxe damage in D&D and some class hit dice.

d20. Twenty sides. The most iconic die in tabletop RPGs. Used for attack rolls, saving throws, skill checks, and ability checks. A natural 20 is a critical hit. A natural 1 is a critical fail.

d100. One hundred sides. Used for percentile tables, wild magic surges, random encounter tables, and loot tables.

Common Uses for a Dice Roller

Dungeons and Dragons. D&D 5th edition uses all 7 standard die types. Combat requires attack rolls (d20 plus attack modifier), damage rolls (weapon die), and saving throws. This tool handles all of them without reaching for a physical dice bag.

Pathfinder. Similar to D&D in die usage. The d20 is central to most checks. The modifier field handles Pathfinder's extensive modifier stacking cleanly.

Call of Cthulhu. This system uses percentile rolls almost exclusively. The d100 button handles every skill check, sanity roll, and combat check in the game.

Board games. Many board games use one or more d6. The dice roller replaces physical dice when playing with remote friends over video call, or when dice are lost.

Decision making. Assign outcomes to numbers. Roll the appropriate die. Whatever it lands on is the answer.

Probability exercises. Statistics teachers use dice to demonstrate concepts like expected value, standard deviation, and the law of large numbers.

Dice Notation Explained

Standard dice notation uses a format like 2d6+3. This means: roll 2 six-sided dice, add them together, then add 3. The formula is: [number of dice]d[die type]+[modifier].

Common examples:

• 1d20 — one twenty-sided die, no modifier
• 2d6 — two six-sided dice, summed
• 4d6 drop lowest — four six-sided dice, drop the lowest result (used for D&D ability scores)
• 1d8+3 — one eight-sided die plus a +3 modifier

Tips for Better Rolls

Set your modifier before you roll. If you always add +5 to attack rolls, set the modifier to 5 and leave it. The tool remembers it for the session.

Use the history panel to track cumulative damage across a combat encounter. Each roll is logged with its die type, result, and modifier.

Roll advantage in D&D by tapping d20 twice. The higher of the two rolls is the result you use. The tool shows both results side by side.

For non-standard ranges, the Random Number Generator works better. If a game calls for a number between 1 and 50, the number generator handles that faster than the dice roller.