How to use the Dice Roller
Choose how many dice to roll, how many sides each die has, and an optional modifier to add or subtract. Roll as often as you like.
Reading dice notation
Tabletop games write rolls like 3d8+2. The first number is how many dice, the number after the d is how many sides, and the last part is a bonus added to the total. So 3d8+2 means roll three eight sided dice, add them up and add 2.
Average results
A single die averages (1 + number of sides) ÷ 2, so a d6 averages 3.5 and a d20 averages 10.5. Two six sided dice average 7, which is also the most likely total. The more dice you roll, the more the totals cluster around the average.
How it works
Each die uses the browser's cryptographically secure random generator.
Examples
- Two six-sided dice (sample result)
2d6: 5, 3 Total: 8
- One d20 with +5 modifier (sample result)
1d20+5: 14 Total: 19 (14 + 5)
- Four d8 (sample result)
4d8: 1, 8, 2, 3 Total: 14
Limitations and assumptions
Each die is independent and fair.
Frequently asked questions
Are the rolls random?
Yes. Each die is drawn with your browser's cryptographic random generator.
What is the average roll of 2d6?
7, with 7 the most likely total and 2 or 12 each occurring 1 time in 36.
How do I read notation like 3d8+2?
Roll three eight-sided dice, add them up and add 2.
Can I roll a d100?
Yes, choose d100 from the sides menu.