Dadi virtuali per giochi di ruolo: tirare dadi online gratis
Tira dadi virtuali per D&D e giochi da tavolo. D4 a D100.
Types of dice and what each is used for
| Die | Sides | Shape | Common use |
|---|---|---|---|
| D4 | 4 | Tetrahedron | Dagger damage, darts |
| D6 | 6 | Cube | Classic die. Short sword, basic spells |
| D8 | 8 | Octahedron | Longsword, mace damage |
| D10 | 10 | Trapezohedron | Percentiles (with D100), bastard sword |
| D12 | 12 | Dodecahedron | Greataxe, barbarian damage |
| D20 | 20 | Icosahedron | THE D&D die. Attacks, saves, skill checks |
| D100 | 100 | Two D10s | Encounter tables, random events |
Roll any virtual die with the NexTools dice roller.
How to use the NexTools dice roller
The NexTools dice roller:
Step 1: Select die type (D4-D100).
Step 2: Choose how many to roll (1-10).
Step 3: Click "Roll" or press Space.
Step 4: See animated result. History shows previous rolls.
Digital random generation — fairer than physical dice with no manufacturing imperfections.
Dice probabilities: understanding the math
D6: 1/6 = 16.67% per face. Average: 3.5.
D20: 1/20 = 5% per face. Natural 20 (crit): 5%.
2D6: Not uniform. 7 is most common (16.67%). 2 and 12 are rarest (2.78%). That's why Catan's 6 and 8 hexes are most valuable.
3D6: Bell curve (10-11 most common). Used for D&D classic stats (average 10.5).
Calculate exact probabilities with the NexTools percentage calculator.
Dice in D&D 5e: when to roll what
Attack: D20 + modifier vs enemy AC. Nat 20 = critical (double damage dice). Nat 1 = critical miss.
Damage: Depends on weapon. Dagger: 1D4. Longsword: 1D8. Greataxe: 1D12. Fireball: 8D6.
Saving throw: D20 + modifier vs DC.
Skill check: D20 + modifier vs DM's DC.
HP on level up: Roll your class die. Fighter: D10. Wizard: D6. Barbarian: D12.
For quick sessions without physical dice, the NexTools roller works perfectly.
Dice notation: how to read 2D6+3 and 4D8-1
Standard RPG notation: NdX+M
- N: Number of dice
- d: "die"
- X: Sides per die
- +M: Modifier added to total
Examples:
2d6+3= roll 2 six-sided, add 3. Range: 5-15.4d8-1= roll 4 eight-sided, subtract 1. Range: 3-31.1d20+5= typical level 3 attack roll.8d6= Fireball (level 3). Range: 8-48, average 28.
Advantage and disadvantage: rolling 2D20
Advantage: Roll 2D20, keep the higher. Disadvantage: Roll 2D20, keep the lower.
Math impact:
- Normal D20 average: 10.5
- With advantage: ~13.8 (+3.3)
- With disadvantage: ~7.2 (-3.3)
Probability of nat 20 goes from 5% to 9.75% with advantage (nearly double).
Also flip coins for decisions with the NexTools coin flipper.
Virtual vs physical dice: pros and cons
Virtual (NexTools): Perfectly random, always available, multiple dice instantly, roll history, no lost dice.
Physical: Tactile experience (part of RPG ritual), no electricity needed, collectible (metal, resin, gemstone sets), some groups feel "it's not the same" rolling virtual.
Hybrid: Many groups use physical in person, virtual for online sessions (Discord, Roll20, VTT).
How digital dice generators work
Virtual dice generate random numbers in a range:
D20: Math.floor(Math.random() * 20) + 1
Is it truly random? Math.random() is pseudorandom. For games it's perfect. A physical die with manufacturing imperfections is LESS random than digital.
For cryptographic randomness, the NexTools password generator uses CSPRNG.
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Are virtual dice as random as physical dice
More so. Physical dice have micro-imperfections causing biases. Digital generators produce perfectly uniform distributions.
What does rolling 2D6+3 mean
Roll 2 six-sided dice, sum results, add 3. If you roll 4 and 5: 4+5+3 = 12. Range: 5-15.
What is the probability of a natural 20 on a D20
Exactly 5% (1 in 20). With advantage: 9.75%. With disadvantage both being 1: 0.25%.
Can I roll multiple dice at once
Yes. NexTools allows selecting quantity (1-10) and type. Roll 4D6, 2D10, 8D6 with one click.
What is D100 and how is it used
D100 generates 1-100. Physically uses 2D10 (tens and units). Used for encounter tables, random events, and in systems like Call of Cthulhu.
What dice do I need to start playing D&D
Basic set: 1D4, 1D6, 1D8, 2D10 (for D100), 1D12, 1D20. Most RPG sets include these 7. Or use the NexTools virtual roller.