Dice Roller
Roll any number of dice with custom sides — D4, D6, D8, D10, D12, D20, D100, or custom.
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How to use this calculator
- 1
Set the number of dice.
- 2
Choose the dice type (D6 is a standard die; D20 is used in tabletop RPGs like D&D).
- 3
Add a modifier (positive or negative number added to the total).
- 4
Click Calculate to roll — each click is a fresh roll.
Frequently asked questions
What is a D20?
A D20 is a 20-sided die used in tabletop role-playing games like Dungeons & Dragons. Rolling a D20 determines the outcome of actions — a 20 is a critical success, a 1 is a critical fail.
What is a modifier?
In tabletop games, modifiers are added to dice rolls based on character stats or abilities. For example, rolling 2D6+3 means roll two six-sided dice and add 3 to the result.
What is a percentile die (D100)?
A D100 gives a result from 1 to 100. It is used for probability-based outcomes — a 1-25 result means a 25% chance event occurred. In D&D, it is often rolled as two D10 dice (units and tens).
Dice rolling for tabletop games and probability
How to use the dice roller
Use this dice roller to roll any number of dice with custom sides — d4, d6, d8, d10, d12, d20, d100, or custom. Enter your values above and get your result in seconds. The tool is free, works on all devices, and keeps your data private — nothing is stored or shared.
How the dice roller works
The dice roller uses standard formulas used in creative projects, testing, and random selection. Enter your inputs, and the tool calculates the result instantly in your browser. No server-side processing means your data stays on your device. Results update in real time as you change inputs.
Common dice in tabletop RPGs
D4: damage for small weapons (daggers). D6: standard die, damage for swords, also used in board games. D8: longswords, greataxes. D10: crossbows, some spells. D12: battle axes, greataxes. D20: skill checks, attack rolls, saving throws. D100: percentage-based events, wild magic tables.
Dice probability
Rolling 2D6 produces results from 2 to 12, with 7 being the most likely (6 ways to make 7 out of 36 total combinations). Rolling 1D12 gives uniform probability of 1/12 for each face. Higher dice counts produce bell-curve distributions due to the central limit theorem.
Dice roller: how it works
Generators automate repetitive creation tasks — producing randomised data, secure values, or formatted outputs on demand. Useful for testing, simulation, creative projects, and application development.
Who uses this tool?
QA engineers, game developers, writers, and security professionals use random generators to create test data, fictional names, one-time codes, and other unique values that must not follow a predictable pattern.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →