Flip a coin online
Striking your coin…
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Photograph both sides. Coinara reads the date, mint mark, and design.
Need more than one toss? Flip 3, 10 or 100 coins and see the count of heads and tails and the longest run. Each result comes from your browser's cryptographic random number generator, so every coin is an independent 50/50 toss.
Almost. A 2023 study by František Bartoš and colleagues recorded 350,757 flips by 48 people and found that a coin lands on the same side it started on about 50.8% of the time, confirming a small bias predicted by Persi Diaconis, Susan Holmes and Richard Montgomery in 2007. If nobody sees which side is up before the toss, the result is effectively 50/50.
Yes, but rarely. Physicists Daniel Murray and Scott Teare estimated in 1993 that an American nickel lands on its edge about once in 6,000 tosses. Thicker coins land on edge more often.
Decide who calls before the toss, flip the coin high with your thumb so it spins end over end, and let it land on a flat surface instead of catching it. Do not look at which side is up before you flip. Online, the fair version is a random number generator: this page uses one for every toss.
Call heads or tails before each toss. Every correct call extends your streak; a wrong call resets it. The server tosses the coin and counts your streak, so the leaderboard cannot be faked. The odds halve with each call: 10 in a row is 1 in 1,024 and 20 in a row is about 1 in a million.
The six coins are real designs: an Athenian owl tetradrachm, a Roman as, a Byzantine solidus, a Spanish pillar dollar, a Morgan dollar and a 1909-S VDB Lincoln cent. Read the story and value of each coin. To learn what an old coin in your own drawer is, start with the old coin identifier guide, or read how to spot a real 1909-S VDB.
