Dice & Coin
Roll dice, flip coins
Options
Result
Nothing rolled yet
Press the button and the result appears here.
Uses a cryptographic random source with rejection sampling to remove modulo bias.
Board game dice have a habit of disappearing under the sofa, and tabletop RPGs need shapes that ordinary dice do not have. Set the sides and the count and roll as many as you need.
How to use
- 1 Choose dice or coins.
- 2 Set the number of sides and how many to roll.
- 3 Press roll.
- 4 The total, highest and lowest are shown, with recent totals kept below.
Frequently asked questions
Is this as fair as a physical die?
Fairer, in fact. Physical dice have manufacturing bias and wear; this uses the browser’s cryptographic random source with rejection sampling, so every face is exactly equally likely.
What is bias correction?
Mapping a random number onto a range with a plain modulo makes low values very slightly more likely. Rejection sampling discards the values that would cause it. The effect is tiny but this avoids it entirely.
Can I roll unusual dice?
Yes — set any number of sides. The tabletop standards (d4, d6, d8, d10, d12, d20) are all supported, as is anything else you need.