How to use the dice roller
- Choose the number of dice, from 1 to 6.
- Choose the sides: d4, d6, d8, d10, d12, d20 or d100.
- Press Roll.
You see each die and the total. Use Copy result to share the roll.
What to expect from two dice
With two six-sided dice there are 36 combinations, and the totals are not equally likely:
| Total | Combinations | Chance |
|---|---|---|
| 2 or 12 | 1 | 2.8% |
| 3 or 11 | 2 | 5.6% |
| 4 or 10 | 3 | 8.3% |
| 5 or 9 | 4 | 11.1% |
| 6 or 8 | 5 | 13.9% |
| 7 | 6 | 16.7% |
That is why seven is the most common total, and why it matters in games like craps. With more dice the totals cluster even more tightly around the average, which is the number of dice times 3.5 for d6.
Other dice
| Die | Sides | Average roll |
|---|---|---|
| d4 | 4 | 2.5 |
| d6 | 6 | 3.5 |
| d8 | 8 | 4.5 |
| d10 | 10 | 5.5 |
| d12 | 12 | 6.5 |
| d20 | 20 | 10.5 |
| d100 | 100 | 50.5 |
When to use it
- Board and tabletop games when you have lost the dice.
- Quick decisions among a few options.
- Learning probability with a few hundred rolls.
If you want the house edge for craps bets, use the craps odds calculator. For why streaks mislead, read the gambler's fallacy and gamblers' rituals.
