A D20 is a 20-sided die numbered 1–20. It is the most iconic die in tabletop RPGs like D&D, used for attack rolls and saving throws.

Is the dice roll truly random?

The roller uses the browser's Math.random() for pseudo-random generation — fair and unbiased for casual gaming purposes.

🎲 Fun Tool

Dice Roller

Q: Can I roll multiple dice at once?

Yes! You can roll 1 to 10 dice simultaneously. The tool shows each individual die result and the total sum.

Roll D4 to D100 — any number of dice at once, with animated results. Perfect for D&D and board games.

100% FreeNo Sign-upInstant ResultsPrivate

Choose Die Type

Number of Dice

Press Roll to cast your dice

How to Use

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Choose a Die

Pick from D4, D6, D8, D10, D12, D20, or D100

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Set Count

Roll 1 to 10 dice at once

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Roll!

Hit Roll and watch the animation

FAQ

What is a D20?

A D20 is a 20-sided die numbered 1–20. It is the signature die in D&D, used for attack rolls, skill checks, and saving throws.

Can I roll multiple dice at once?

Yes! Roll 1 to 10 dice simultaneously and see each result plus the total.

Where can I see my roll history?

The Roll History section shows your last 10 rolls with timestamps.

🎲 Complete Dice & Randomness Guide

Probability Theory and the Mathematics of Dice

Probability theory, expected value, random number generation, and TRPG/board game applications fully explained.

Dice Probability Theory Basics

Rolling a 6-sided die (D6) gives each face (1-6) an equal 1/6 ≈ 16.7% probability — a uniform distribution. Rolling 2 D6 makes 7 the most likely result (6 out of 36 = 16.7%), approaching a bell curve. As more dice are added, middle values become more likely — this is the Central Limit Theorem.