How to use it
- Set the number of dice with the slider (1 to 10).
- Choose the number of sides: 4, 6, 8, 10, 12 or 20.
- Press Roll. The individual values and the total appear on the right.
How the odds work
One fair die gives every face the same chance, 1 in the number of sides. Adding dice changes that: with two six-sided dice there are 36 combinations, only one of which makes 2, while six of them make 7. That is why 7 is the most common total of 2d6, with a probability of 6/36, about 16.7 percent.
Example
3d6 for a tabletop character stat: three dice give a total between 3 and 18, and the middle totals (10 and 11) are the most likely.
Tips
- A d20 gives each number from 1 to 20 a 5 percent chance.
- For a custom range such as 1 to 100, use the random number generator.