Heads: 0 · Tails: 0
Need a fair 50/50? Flip a coin above — one flip for a decision, or 10× and 100× batches to watch probability settle toward half-and-half. The counter keeps a running score of heads vs tails.
Is a coin flip really 50/50?
Almost. Physical coins carry a tiny bias: a Stanford study found a caught coin lands the way it started about 51% of the time, because of wobble in a human toss. Our flip has no such physics — it uses the browser’s random number generator, so every flip is a clean 50/50, which is arguably fairer than the real thing.
The law of large numbers, live
Hit 100× a few times and watch the totals. Ten flips can easily come up 7-3; a thousand flips almost never stray far from 500-500 in percentage terms. That narrowing is the law of large numbers — randomness is lumpy in small doses and smooth in bulk. It’s also why “tails is due” after five heads is a fallacy: the coin has no memory, and each flip is still exactly 50/50.
Google’s version and friends
Searching “flip a coin” gives Google’s built-in flipper — part of a small family of instant tools that includes a dice roller and a spinner. Ours adds the batch flips and running tally that make the statistics visible. For more decision-avoidance, there’s always tic-tac-toe, or settle it like it’s 1998 at Google in 1998.
Is this coin flip truly random?
It uses the browser’s pseudo-random generator — statistically indistinguishable from fair for any real-world decision, with none of a physical coin’s slight catch bias.
What does flipping 100 at once show?
The law of large numbers: small batches swing wildly, big batches settle near 50/50. It’s a one-click statistics demo.
After five heads, is tails more likely?
No — that’s the gambler’s fallacy. Each flip is independent and stays 50/50 regardless of history.
Does Google have a coin flip?
Yes — search “flip a coin” and an animated flipper appears at the top of results, alongside its dice-roll and spinner cousins.