Dice Roller & Coin Flip
Roll dice or flip a coin.
Dice Roller & Coin Flip at a glance
Dice Roller & Coin Flip is a free online developer tool you can use right now to roll dice or flip a coin โ no account, no install and no usage limit. It runs entirely inside your browser, so whatever you enter stays on your own device.
- Price
- Free โ no trial, no paid tier, no watermark
- Sign-up
- Not required
- Where it runs
- In your browser โ nothing is uploaded to a server
- Works on
- Chrome, Safari, Firefox and Edge โ desktop, tablet and phone
- Category
- Developer Tools
๐ฒ Dice
๐ช Coin
About Dice Roller & Coin Flip
Roll dice or flip a coin when the physical article is missing โ for a board game, a tabletop session, or settling something quickly.
Multiple dice can be rolled at once with the total shown, which matters for tabletop games where 3d6 is a different proposition from 1d20 even though both peak in a similar range. Rolling three six-sided dice produces a bell curve strongly clustered around 10 and 11, because there are many combinations that sum to those and exactly one that sums to 3. A single twenty-sided die is flat โ every result from 1 to 20 is equally likely. That difference in distribution is the whole reason game systems specify dice the way they do.
On coin flips and the gambler's fallacy: each flip is independent, so five heads in a row does not make tails more likely on the sixth. The coin has no memory. The probability remains one half every time, and any intuition that a run is 'due' to break is simply wrong โ this is among the most persistent errors in reasoning about probability.
Results come from the browser's random source and are uniformly distributed, so a die is fair in a way a physical die with worn edges is not.
How to use Dice Roller & Coin Flip
- Choose your dice type and how many to roll, or select the coin.
- Roll or flip โ the result and the total appear immediately.
- Roll again as many times as you need.
Frequently asked questions
Are the rolls genuinely fair?
Yes. Results come from the browser's random source and are uniformly distributed, so every face is equally likely. That makes it fairer than a physical die, which can be biased by wear or manufacturing.
After five heads, is tails more likely?
No. Each flip is independent and the probability stays at one half regardless of history. The belief that a run is 'due' to break is the gambler's fallacy โ the coin has no memory of previous flips.
Why does rolling 3d6 feel different from 1d20?
Because the distributions differ. Three six-sided dice produce a bell curve clustered around 10 and 11, since many combinations sum there and only one sums to 3. A twenty-sided die is flat, with every result equally likely. Game systems choose between them deliberately.
Which dice types are supported?
The standard tabletop set โ d4, d6, d8, d10, d12 and d20 โ and you can roll several at once with the total shown.