Dice Roller
Roll virtual dice for tabletop RPGs, board games, and probability experiments. Supports D4, D6, D8, D10, D12, D20, and custom dice.
About this calculator
Roll one or many dice: D4, D6, D8, D10, D12, D20 or a custom number of sides. See each die and the total.
Made for tabletop RPGs, board games and probability experiments.
How to use it
- Choose the dice type (or enter custom sides).
- Set how many dice.
- Press Roll!
Dice probability
One fair die with s sides gives each face probability 1/s, and an average of (s + 1)/2. Rolling several dice and adding them makes middle totals likelier: with two D6, 7 occurs 6 ways out of 36 (16.7%), while 2 and 12 occur only once each (2.8%). A D20 hits any number 5% of the time; rolling a natural 20 is 1 in 20.
Worked example
Two six-sided dice
| Total 7 | 6 of 36 = 16.7% |
| Total 2 or 12 | 1 of 36 = 2.8% each |
| Total 6 or 8 | 5 of 36 = 13.9% each |
Tips and common mistakes
- More dice make results cluster around the average.
- A D20 has no memory; streaks are normal.
- 2D6 averages 7; 3D6 averages 10.5.
- Use custom sides for uncommon dice.
- Agree on whether to re-roll ties before you start.
Frequently asked questions
Are the dice fair?
Yes, each face is equally likely.
What is the most common 2D6 total?
7.
How likely is a 20 on a D20?
5%.
What does 3d6 mean?
Roll three six-sided dice and add them.
Can I roll odd dice like D30?
Yes, enter custom sides.
Is it free?
Yes.