Coin Flip
Flip one or many coins and count the heads and tails.
Results update as you type.
About this calculator
A coin flip tool simulates tossing one or more fair coins, each with an equal 50% chance of heads or tails. Flip a single coin to settle a yes/no decision, or flip many at once to see the split between heads and tails — a quick, hands-on demonstration of probability. It reports the result, the counts of heads and tails, the percentage that came up heads, and a heads-versus-tails chart. Every change to the number of coins triggers a new flip.
Worked example: flip one coin and you simply get heads or tails. Flip 100 coins and you might see 53 heads and 47 tails (53% heads) — close to but rarely exactly 50:50. Flip 1,000 and the share of heads sits even nearer 50%, showing the law of large numbers at work.
People use it to make a fair decision, break a tie, choose who goes first, or illustrate randomness and probability in a classroom.
Frequently asked questions
What are the odds of heads or tails?
A fair coin has a 50% chance of each on every flip, independent of previous flips. Over many flips the counts of heads and tails tend to even out, but any single flip is still an even bet.
Can I flip many coins at once?
Yes — set the number of coins and the tool flips them all together, showing the total heads and tails and the heads percentage. Flipping hundreds at once shows how the ratio approaches 50:50 as the count grows.
If I just got five heads, are tails now “due”?
No — that is the gambler’s fallacy. Each flip is independent, so after any streak the next flip is still exactly 50/50. The counts even out over many flips not because the coin corrects itself, but because a long run gets diluted by the sheer number of later flips.
How many heads should I expect in 10 coin flips?
Five on average, but any result from 0 to 10 is possible. Getting exactly five happens only about a quarter of the time; anywhere from four to six heads covers roughly two-thirds of outcomes. Flip 10 here a few times to see the spread.
How do I decide something with a best-of-three coin toss?
Flip a single coin three times, or flip three coins at once, and take the majority — whichever of heads or tails appears at least twice wins. It reduces the chance of an unlucky one-off deciding the outcome.
What is the heads percentage for?
It is the share of flips that came up heads — heads ÷ total × 100. With a single coin it is 0% or 100%; across many coins it hovers near 50%, and the further from 50% it sits, the bigger the streak you happened to flip.
API — use this calculator from code
Call this calculator as a free JSON endpoint — no key required. Send the field values below as query parameters or JSON. Read the full API docs →
Endpoint
GET https://calculator.free/api/v1/coin-flip/curl
curl "https://calculator.free/api/v1/coin-flip/?count=1"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/coin-flip/?" + new URLSearchParams({
"count": "1"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.