Dice Roller & Coin Flip

Roll dice or flip a coin online

This dice roller rolls virtual dice and flips a coin in one place. Use it for board games, tabletop role-playing games, classroom activities or any quick random decision when you do not have real dice or a coin to hand.

How to use it

1. Choose Roll Dice or Flip Coin.
2. For dice, pick a type: d4, d6, d8, d10, d12, d20 or d100.
3. Use the slider to set the number of dice, from 1 to 10.
4. Click Roll (for example “Roll 2d6”) to see each die and the total, or click Flip Coin for Heads or Tails.
5. Check Recent Rolls for your last 10 results.

How the rolls are made

Each die and each coin flip uses your browser's cryptographic random number generator (crypto.getRandomValues) rather than the basic Math.random. A die with N sides returns a whole number from 1 to N, so a d10 gives 1–10 and a d100 gives 1–100. With several dice, the total is the sum of all the dice.

Example: rolling 2d6 can give any total from 2 to 12. A total of 7 is the most likely, because 6 of the 36 possible combinations add up to 7 (1+6, 2+5, 3+4, 4+3, 5+2, 6+1).

Dice types at a glance

Die	Range	Average roll	Common use
d4	1–4	2.5	Small damage rolls
d6	1–6	3.5	Board games
d8	1–8	4.5	Weapon damage
d10	1–10	5.5	Percentile and RPG systems
d12	1–12	6.5	Large damage rolls
d20	1–20	10.5	Attack rolls and checks in tabletop RPGs
d100	1–100	50.5	Percentage chances

The average of one die is (sides + 1) ÷ 2. For several dice, multiply by the number of dice: 3d6 averages 10.5.

Frequently asked questions

Can I choose a custom number of sides?

No. You can choose one of the seven standard dice listed above.

Is the coin flip fair?

Yes. Heads and Tails each have an equal chance, using the same random generator as the dice.

Is my roll history saved?

No. The last 10 results stay on screen until you leave or reload the page.