Lifestyle
Coin Flip
Flip a virtual coin once or thousands of times. Uses cryptographically secure randomness for fair outcomes.
Flip a coin
Click Flip to start.
Frequently Asked Questions about the Coin Flip
Is the coin flip truly random?
Yes. The calculator uses your browser's Web Crypto API (crypto.getRandomValues), a cryptographically secure random source suitable for fair, unbiased decisions. It falls back to Math.random() only when the Crypto API is unavailable.
What is the probability of heads or tails?
Each flip is exactly 50/50, a 0.5 probability for each side. Every flip is independent, so a run of five heads does not make tails any more likely on the sixth flip. Over many flips the observed ratio converges toward 50%, but small samples can deviate noticeably.
How many flips show the law of large numbers?
At 100 flips you will often see a heads rate somewhere between 42% and 58%. At the maximum of 1,000 flips the range typically tightens to about 47% to 53%. Run several 1,000-flip batches to watch the totals cluster near 500.
Can I do best-of-three?
Set the number of flips to 3 and read the result. Whichever side lands more often wins, since two or more out of three decides it.