DnD Dice Roller Calculator
Supports expressions like “4d6+2” or “2d20” and summarizes roll totals, modifiers, and individual results.
Format: NdS + modifier (modifier optional). Example: 3d8+4.
Individual rolls: —
Modifier: +2
Total: 2
How to Use This Calculator
- Enter a dice expression (NdS+M syntax) representing number of dice, sides, and optional modifier.
- Click “Roll” to simulate random outcomes.
- Review individual results, modifiers, and total.
- Use the output to adjudicate attacks, skill checks, damage, or other D&D-style roll mechanics.
Formula
Roll NdS: generate N independent uniform integers from 1 to S.
Total = Σ rolls + modifier
Expected value = N × (S + 1) / 2 + modifier
Full Description
DnD-style dice notation enables compact expression of multiple dice rolls with optional modifiers. This calculator parses the notation, rolls the corresponding dice, and summarizes the results, making it ideal for tabletop gaming and quick probability exploration.
Frequently Asked Questions
Does it support negative modifiers?
Yes. Use syntax like 3d10-2.
Can I include multiple dice types in one expression?
This tool handles single-format expressions. For complex expressions, roll each component separately.
Are exploding dice supported?
No. Rolls reflect standard D&D dice without special mechanics.
Is the RNG game-balanced?
Rolls rely on uniform randomness, which mirrors fair dice rolls.