Dice & Coin

Settle it with an honest roll

Q: Is the dice roll actually random?

Each roll draws from the browser cryptographic random generator, and values landing in the uneven remainder are rejected and redrawn so all six faces are exactly equally likely.

Q: Does the previous result affect the next one?

No. Every roll is independent, so a run of tails does not make heads due on the next flip. That intuition is known as the gambler's fallacy.

Q: Can I use it for a real decision or a game?

Yes for board games, classroom picks and settling arguments. It is not intended for gambling or anything requiring a certified auditable random source.

Q: What does the fairness line mean?

It shows how far actual results sit from a perfectly even spread. Early on it looks skewed, which is normal, and should drift towards even as rolls accumulate.

Every roll and flip comes from your browser's cryptographic random generator, with the bias that trips up most online dice removed. The tally shows you how fair it has actually been.

Coin flip

Heads or tails, 50/50, every time.

₹

TAILS

— Press flip to start

Tally

No flips yet

Dice roll

One to six dice, standard six-sided.

— Press roll to start

Faces rolled

No rolls yet

On fairness

Why most online dice are slightly loaded

Not deliberately — it is the same small mistake repeated across thousands of pages.

Cryptographic randomness

Results come from the browser's cryptographic generator rather than the ordinary pseudo-random function, which is seeded predictably and was never designed for anything that matters.

The modulo problem

Squeezing a huge random number into six outcomes with a remainder leaves the low faces very slightly more likely, because the range does not divide evenly. This tool discards values that fall in the uneven tail and draws again, which removes the bias completely.

Check it yourself

The tally under each tool counts every result and reports how far the spread sits from perfectly even. Roll a hundred times and watch it settle — that is what fair looks like in practice, wobble and all.

Questions

Frequently asked

Is the dice roll actually random?

Each roll draws from your browser's cryptographic random generator, and values landing in the uneven remainder are rejected and redrawn so all six faces are exactly equally likely. It is not predictable from previous rolls and nothing is pre-decided.

I rolled four sixes in a row — is it broken?

No. Four sixes in a row happens about once every 1,296 attempts, so with a few hundred rolls it is expected rather than surprising. Genuinely random sequences contain more streaks than people intuitively expect, which is why hand-made "random" lists look wrong to statisticians.

Does the previous result affect the next one?

Not at all. Every roll is independent, so a run of tails does not make heads "due" on the next flip. That intuition is common enough to have a name — the gambler's fallacy — and the tally on this page is a good way to see it fail in practice.

Is my tally saved?

It is kept in your own browser so it survives a refresh, and nothing is sent to a server. The reset button under each tool clears it, as does clearing your browser data.

Can I use it for a real decision or a game?

Yes — board games, classroom picks, settling an argument. It is not intended for gambling or for anything requiring a certified, auditable random source, which needs a very different kind of system.

What does the fairness line mean?

It shows how far your actual results sit from a perfectly even spread. Early on it will look badly skewed, which is normal — with few rolls, chance dominates. It should drift towards even as the number of rolls grows.