Coin Flip

Flips a virtual coin — heads or tails from the browser's random number generator, with a running tally when you flip repeatedly. A fair 50-50 with no coin required.

How to use

1. Flip.
2. Read the result; flip again as needed.
3. Use the running tally to watch the ratio settle toward half and half.
4. Agree what heads means before flipping — the classic dispute is about the stakes, not the coin.

When you actually need this

• Settling a two-way choice — who goes first, which restaurant, whose turn.
• Making an unbiased call when a group is deadlocked between two options.
• Running quick probability demonstrations for a class or a curious kid.
• Replacing a physical coin nobody carries anymore.

Fairness, streaks, and the gambler's fallacy

Each flip draws fresh from the browser's RNG at 50-50, and no flip remembers the last — five heads in a row leaves the sixth at exactly 50-50, which is the gambler's fallacy in one sentence. Streaks are also far more common than intuition expects: in twenty flips, a run of four or more of a kind is more likely than not. The tally illustrates the law of large numbers — proportions drift toward 50% over many flips while short sequences stay lumpy. Physical coins, for what it is worth, are measurably less fair than this: a real coin caught in the hand shows a slight bias toward its starting face.

Related tools

FAQ

Is the result from Coin Flip genuinely random?

It uses the browser's built-in random number generator, which is uniform and unpredictable for everyday purposes such as picking a name, settling a decision or running a giveaway. It is not a cryptographic source and should not be used to generate keys or secrets.

Can the outcome be rigged or predicted?

No. Each draw is generated fresh in your browser at the moment you press the button, with no server involved and no stored sequence. Nobody, including us, can see or influence the result.

Can I use Coin Flip to pick winners for a giveaway?

Yes, and it is a common use. For transparency, record your screen while you draw or take a screenshot of the result so participants can see the outcome was not edited afterwards.