A fair 50/50 coin flip — flip one coin or ten, and track your streaks. Fairer than a real coin (really — see the FAQs).
Press Flip and get heads or tails instantly, at exactly 50/50 odds from a cryptographic random generator. Flip up to 10 coins at once, and the tracker counts your running heads/tails totals and longest streak — useful for settling decisions or demonstrating probability.
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How to flip a coin online
1Choose how many coins to flip (1 to 10).
2Press Flip — each coin lands heads or tails at exactly 50/50 odds.
3Watch the tracker: running totals and your longest streak update after every flip.
Yes — exactly. It uses crypto.getRandomValues(), so each flip is an independent 50/50 event. Interestingly, a real physical coin toss is NOT perfectly fair: a 2023 study of 350,757 human tosses found coins land on the same side they started about 50.8% of the time.
One in 32 (about 3.1%). Each flip is independent at 1/2, so five in a row is (1/2)^5. Ten in a row is 1 in 1,024. The tracker on this page counts your longest streak so you can see how rare your run really was.
Yes — up to 10 coins per flip, with the heads/tails split shown instantly. With 10 coins, an exact 5-5 split occurs only about 24.6% of the time — most flips are uneven, which surprises most people.
Measurably yes. Real tosses carry a ~0.8% same-side bias (Bartos et al., 2023, 350,757 tosses) and can be influenced by technique. A cryptographic flip has zero bias and zero skill component — it cannot be gamed.
Heads is the side of a coin bearing a face or portrait; tails is the reverse side. The convention dates to ancient Roman coins, which carried the emperor’s head on the obverse. When flipping to decide something, call your side before the flip.
Yes, free — the embed snippet at the bottom of the page gives you an iframe for any site, blog, or classroom page. Teachers use it for probability lessons; leagues use it for kickoff decisions.
A coin flip is the fastest universally-trusted fair decision: both outcomes are equally likely, the result is immediate and visible, and neither side can influence it. That is also why coin flips settle tied elections in several US states.
Yes — it runs in any modern browser on phone, tablet, or desktop. After the page loads it needs no network connection, and there is nothing to install.
Embed this coin flip on your site — free
Teachers, bloggers, league organizers: paste this snippet into any page. No attribution needed beyond the built-in link.
