Dice Roller
Roll virtual dice for tabletop RPGs, board games, and more. Supports all standard dice (d4, d6, d8, d10, d12, d20, d100) with modifiers and history tracking.
Last Roll
Roll Dice
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Click to roll
Quick Roll
Custom Dice Notation
Format: XdY or XdY+Z (e.g., 2d6, 1d20+5, 3d8-2)
Quick Presets
Quick Single Die
D20 Probability Reference
| Target | Chance (1d20) | With Advantage | With Disadvantage |
|---|---|---|---|
| 10+ | 55% | 79.75% | 30.25% |
| 15+ | 30% | 51% | 9% |
| 18+ | 15% | 27.75% | 2.25% |
| 20 | 5% | 9.75% | 0.25% |
| Nat 1 | 5% | 0.25% | 9.75% |
Quick Answer
Click to roll virtual dice instantly. Standard dice notation: NdX+M where N = number of dice, X = sides, M = modifier. Example: 2d6+3 means roll two 6-sided dice and add 3. D20 is standard for D&D attack/skill rolls. D100 (percentile) uses two D10s (one for tens). Our roller uses cryptographically secure random numbers.
Key Facts
- Standard polyhedral dice: D4, D6, D8, D10, D12, D20, D100
- Dice notation: NdX+M (N dice with X sides plus modifier M)
- D20: main die for D&D rolls (attacks, saves, skills)
- D100 (percentile): roll 2d10, one as tens digit
- Average roll formula: (max + 1) / 2 (d6 average = 3.5)
- Advantage (D&D): roll 2d20, take higher; Disadvantage: take lower
- Fair dice should have equal probability for each face
- Digital dice use pseudo-random number generators
Frequently Asked Questions
Dice notation follows the format XdY+Z where X is the number of dice, Y is the number of sides, and Z is a modifier. 2d6+3 means roll 2 six-sided dice and add 3 to the total. The modifier can be positive (+) or negative (-).
Online dice rollers use pseudorandom number generators (PRNGs) which are statistically random enough for gaming purposes. They produce uniform distributions over time. For cryptographic purposes, specialized random sources are needed, but for tabletop gaming, PRNGs are perfectly suitable.
Advantage means rolling 2d20 and taking the higher result. Disadvantage means rolling 2d20 and taking the lower result. This mechanic replaces most situational modifiers in D&D 5th Edition and significantly affects probability.
Common RPG dice include: d4 (tetrahedron), d6 (cube), d8 (octahedron), d10 (pentagonal trapezohedron), d12 (dodecahedron), d20 (icosahedron), and d100 (percentile, often two d10s). D&D primarily uses d20 for most checks.
The standard method is 4d6 drop lowest: roll 4 six-sided dice, remove the lowest die, and sum the remaining three. Repeat 6 times for all abilities. This gives a range of 3-18 with an average of about 12.2.
Last Roll
Roll Dice
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Click to roll