CalcWhenCoin Flip
Flip 100 coins and you will usually land within a few of 50 heads — but exactly 50/50 happens only about 8% of the time, which is why single flips feel streaky and fair at once.
How it works
The oldest decision machine in the world, minus the coin, the floor, and the argument about whether it landed on a crack. One flip settles the question; a hundred flips show you what fairness actually looks like — near-even splits with honest wobble, and streaks that mean nothing at all.
Calling it in the air remains your responsibility.
The method
Each flip is one bit drawn from crypto.getRandomValues — heads on 0, tails on 1 — so every flip is independent and exactly 50/50. Batch percentages are counts divided by flips, nothing fancier.
Frequently asked questions
Is it really 50/50?
Yes — one unbiased cryptographic bit per flip. Real coins have tiny biases from their faces and the flipper's technique; this one has neither.
Why did I get five heads in a row?
Because in 100 flips, a run of five heads somewhere is not just possible but likely. Streaks are what randomness looks like; perfect alternation would be the suspicious result.
Can a coin flip make a good decision?
It settles ties fairly, and it has a second use: the moment the coin is in the air, you often discover which result you were hoping for. That discovery is the decision.