Dice Roller

Roll virtual dice for board games, role-playing games, classroom probability or quick decisions. Pick standard polyhedral dice from d4 to d100, any number of sides, or your own faces such as colours or chores. Add a modifier, roll the same set many times and compare what came up with what probability predicts.

How to use this tool

1. Choose how many dice to roll and which type.
2. For unusual dice, pick “Other number of sides” or type your own faces separated by commas.
3. Add a modifier if your game adds a bonus to the total, and choose how many times to roll the set.
4. Press the button to roll; the dice shake and show the result.

Formula

Expected total = n × (s + 1) ÷ 2 + modifier

n is the number of dice and s the number of sides (faces 1 to s). For custom numeric faces the average face replaces (s + 1) ÷ 2. Every face of every die has probability 1 ÷ s.

Example

Rolling 3d6 + 2: the total can range from 3 + 2 = 5 to 18 + 2 = 20, and the expected total is 3 × 3.5 + 2 = 12.5. A roll of 4, 6 and 1 gives 11 + 2 = 13.