Dice Roller
Roll virtual dice for tabletop games, D&D, and more
How to Use This Dice Roller
- Click a quick roll button (d4, d6, d8, d10, d12, d20, d100) or enter custom values
- Set the number of dice to roll (1-100)
- Enter number of sides for custom dice
- Add a modifier to add or subtract from the total
- Toggle individual results display on or off
- Click 'Roll Dice' to generate random results with history tracking
Example: Rolling 2d6+3 (two six-sided dice plus 3) for a D&D longsword damage roll: results might show [4, 6] = 10, plus modifier = 13 total damage.
Tip: Green-highlighted dice show maximum rolls (critical for that die), while red shows minimum rolls (natural 1s).
Why Use a Dice Roller?
Virtual dice provide instant, fair random results for tabletop gaming, teaching probability, and decision-making.
- Play D&D, Pathfinder, or other tabletop RPGs online or without physical dice
- Roll dice for board games like Monopoly, Risk, or Yahtzee
- Generate random numbers for statistics exercises or simulations
- Make impartial decisions when you can't decide between options
- Teach probability concepts with immediate visual feedback
- Test game mechanics during board game or RPG design
Understanding Your Results
Dice notation follows the NdX+M format: N dice with X sides plus modifier M.
| Result | Meaning | Action |
|---|---|---|
| Natural 20 (d20) | Critical success | In D&D, often means automatic success or double damage |
| Natural 1 (d20) | Critical failure | In D&D, automatic miss regardless of bonuses |
| Maximum roll (any die) | Best possible | Highlighted in green - celebrate your luck! |
| Average roll | Expected outcome | For a d6, average is 3.5; for d20, it's 10.5 |
Meaning: Critical success
Action: In D&D, often means automatic success or double damage
Meaning: Critical failure
Action: In D&D, automatic miss regardless of bonuses
Meaning: Best possible
Action: Highlighted in green - celebrate your luck!
Meaning: Expected outcome
Action: For a d6, average is 3.5; for d20, it's 10.5
Note: Each roll is independent - previous results don't affect future rolls. There's no such thing as being 'due' for a good roll.
About Dice Roller
Formula
Probability of specific result = 1 / Number of sides For a fair die, each face has equal probability. Rolling 2d6 creates 36 combinations, with 7 being most likely (6 ways to roll it) and 2 or 12 least likely (1 way each).
Current Standards: Standard dice notation (NdX+M) was popularized by Dungeons & Dragons in the 1970s and is now universal in tabletop gaming.
Frequently Asked Questions
What does 2d6+3 mean?
This is standard dice notation: roll 2 six-sided dice and add 3 to the total. The format is NdX+M where N is number of dice, X is number of sides, and M is modifier. 1d20+5 means one twenty-sided die plus 5. 3d8-2 means three eight-sided dice minus 2. This notation appears in almost all tabletop RPG rulebooks.
Are online dice truly random?
Virtual dice use pseudo-random number generators (PRNGs). Our roller uses cryptographically secure randomization, which is statistically indistinguishable from true randomness for gaming purposes. Physical dice can actually be less fair due to manufacturing imperfections, worn edges, or biased throwing techniques. For most applications, virtual dice are 'more fair' than physical ones.
What are the odds of rolling a natural 20?
Exactly 5% (1 in 20) for a single d20 roll. Rolling two d20s with advantage (keeping the higher) increases your chance of getting at least one 20 to about 9.75%. The chance of rolling consecutive 20s is 0.25% (1 in 400). Rolling three 20s in a row: 0.0125% (1 in 8,000).
Why is 7 the most common result with 2d6?
There are 6 ways to make 7 (1+6, 2+5, 3+4, 4+3, 5+2, 6+1) out of 36 total combinations (6x6). That's a 16.67% chance. Compare to 2 or 12, which can only be made one way (1+1 or 6+6) - a 2.78% chance each. This bell-curve distribution is why games like Craps center around 7.
What's the average roll for each die type?
Average = (minimum + maximum) / 2 + 0.5. So: d4 averages 2.5, d6 averages 3.5, d8 averages 4.5, d10 averages 5.5, d12 averages 6.5, and d20 averages 10.5. For multiple dice, multiply by the number of dice: 2d6 averages 7, 4d6 averages 14.