Flip a Coin

Go Flip Coin is a free online coin toss that gives you heads or tails in one click. Whenever you need to toss a coin and there is none to hand, this virtual coin does the job: it runs entirely in your browser, needs no sign-up, and keeps a running count of your results. Use it to settle a choice, break a tie, or start a game.

How do you flip a coin online?

Click the coin or press the flip button, and the coin flip simulator shows heads or tails immediately and adds the result to your running totals. Press the spacebar to flip again without reaching for the mouse. There is nothing to install and nothing to sign up for. If you only want someone to flip a coin for you, this is the whole job: one tap, one answer.

You can flip a coin as many times as you like. The counters track heads, tails and total flips, so you can watch the split even out over a long run instead of guessing.

Head or tail? Tossing a coin for cricket and games

The coin toss is how most sports decide who starts. Before a cricket match, the two captains meet in the middle: one tosses a coin, the other calls head or tail while it is in the air, and whoever wins the toss chooses to bat or bowl first. Football, tennis and many board games settle kick-off or first move the same way.

When nobody has a coin, an online toss does the same job. One person calls heads or tails out loud, the other presses flip, and everyone sees the same result on screen at the same moment. Because the toss happens on a shared screen rather than in one person's hand, nobody can argue about how it was caught.

Is a coin flip really 50/50?

Almost, but not quite, and the reason is more interesting than most people expect.

In 2007, mathematicians Persi Diaconis, Susan Holmes and Richard Montgomery published a physics model of the coin toss. A flipped coin does not spin cleanly on one axis. It wobbles, so it spends slightly more time with its starting face pointing up. They predicted a real coin lands on the side it started on about 51% of the time.

In 2023, a team led by František Bartoš at the University of Amsterdam went and tested it. Forty-eight people flipped coins from 46 different currencies 350,757 times, recording which side started face up each time. The coin landed on its starting side 178,079 times, or 50.8%, with a 95% credible interval of 50.6% to 50.9%. The prediction held. The study was published in the Journal of the American Statistical Association in 2025.

Here is the part almost every coin flip site gets wrong. That same study found heads came up 50.0% of the time overall, with an interval of 49.8% to 50.2%. So a physical coin is genuinely fair between heads and tails. The bias is not toward heads. It is toward whichever side started facing up.

The effect comes from the wobble, not from the coin itself, so the same logic applies whether you flip a quarter, a penny or a one-rupee coin.

Two things follow from that:

• If you are calling a physical toss and you can see which side is facing up before the flip, calling that side gives you roughly a 50.8% edge. Small, but real.
• Go Flip Coin has no starting side and no wobble, so the bias does not apply here. A digital flip is closer to a true 50/50 than a real coin is.

What are the odds of getting heads several times in a row?

Every flip is independent. A run of heads does not make tails more likely on the next flip, and believing otherwise is the gambler's fallacy. The odds of a specific streak are one half multiplied by itself once per flip:

Heads in a row	Probability	Odds
2	25%	1 in 4
3	12.5%	1 in 8
5	3.125%	1 in 32
10	0.098%	1 in 1,024
20	0.0001%	1 in 1,048,576

Streaks feel far rarer than they are. Flip a coin 100 times and you have roughly an 81% chance of hitting a run of six or more identical results somewhere in there. That is normal, not a sign the coin is rigged.

What happens if you flip a coin 100 times?

You will not get exactly 50 heads, and that is expected. The chance of landing on precisely 50 is only 7.96%. What you should expect is a result near the middle, not on it:

• Between 45 and 55 heads: 72.9% of the time
• 60 or more heads: 2.84% of the time

This is worth trying on the tool itself. Flip 100 times, note your split, then do it again. The counts wander, but they stay close to half. This is the law of large numbers in action: the proportion of heads settles toward 50% as flips add up, even though the raw gap between heads and tails tends to grow.

What happens if a coin lands on its side?

It happens, just rarely. In 1993, physicists Daniel Murray and Scott Teare modelled and tested this in Physical Review E and estimated that a US nickel lands on its edge roughly once in 6,000 tosses, about 0.017%.

The number depends heavily on the coin and the surface. Thicker coins relative to their diameter stand up more often, and thin coins with milled edges almost never do. A coin dropped on carpet has a better chance of staying upright than one landing on tile, which usually bounces it flat.

If you want a genuine three-sided outcome rather than a fluke, do not wait for an edge landing. Flip twice and read the pair: two flips give four combinations, so assign one option to heads-heads, one to tails-tails, and reflip on a mixed result.

Can you ask Siri or Google to flip a coin?

Yes. Say "Hey Siri, flip a coin" and Siri returns heads or tails out loud. The Google coin flip is a small widget that appears when you search for "flip a coin", and Alexa answers the same request on Echo devices. They all work, and for a single quick call they are fine.

Where they fall short is anything beyond one flip. A voice assistant gives you a result and forgets it. There is no running tally, no way to flip 100 times and see the split, no shareable page, and nothing to look at. Go Flip Coin keeps your counters on screen, so it suits tie-breaks in a group, classroom demonstrations and repeated flips far better than a voice command does.

Is this coin flipper actually random?

Yes. Every flip is a random coin flip drawn fresh at the moment you press the button. Here is how the coin flip generator works under the hood.

Go Flip Coin uses crypto.getRandomValues(), the browser's Web Crypto API, which draws on the operating system's cryptographic entropy source. It does not use Math.random(), which is a pseudorandom generator never designed to guarantee fairness.

That distinction matters more than it sounds. Several coin flip sites advertise "true random" results while running on Math.random() underneath. The Web Crypto API is the correct tool for this, and it is what Go Flip Coin runs on.

Every flip is independent. Go Flip Coin does not weight results, does not adjust based on your history, does not steer toward an even split, and does not send anything to a server. Your counters live in your browser and disappear when you clear your data.

Using a coin flip to make a decision

There is an old trick for using a coin on choices that are not really 50/50. Flip it, then catch your own reaction before you look away. Relief means you wanted that outcome. Disappointment means you wanted the other one, and now you know.

This is often attributed to Sigmund Freud, though no primary source for it has ever surfaced, so treat that as folklore rather than fact. The Danish poet Piet Hein wrote a short verse on the same idea in his 1966 collection Grooks, about the moment the coin is in the air being the moment you find out what you were hoping for.

The method works because it separates two different jobs: making the decision, and admitting the one you had already made. If your first instinct is to flip again, you have your answer.

Common uses:

• Choosing between two options when both are genuinely fine
• Deciding who goes first in a game
• Breaking a tie or settling a small dispute
• Picking at random for a classroom or group activity
• Demonstrating probability, by flipping 100 times and comparing against the table above

For a plain yes-or-no question, decide before you flip which side means yes. Heads for yes and tails for no is the usual convention.

Frequently asked questions

Is this coin flipper fair?

Yes. Go Flip Coin uses the browser's Web Crypto API rather than a general-purpose pseudorandom generator, so heads and tails are equally likely on every flip. Results are not weighted, not adjusted based on previous flips, and not influenced by how long you have been on the page.

Can you flip a coin for me?

Yes. Press the flip button above, or tap the coin, and Go Flip Coin will toss a coin for you and show heads or tails straight away. Press it again as often as you like; every coin flip online here is independent of the last.

Is a real coin toss fair?

Between heads and tails, yes. A 2023 study of 350,757 flips found heads came up 50.0% of the time. That same study found coins land on the side they started on 50.8% of the time, so a real coin is fair on heads versus tails and slightly biased toward its starting position.

Can you predict or influence a coin flip?

Not reliably. With a physical coin, seeing which side starts face up gives you an edge of roughly 0.8 percentage points, based on the Bartoš study. Skilled flippers can do better under controlled conditions, but a normal thumb flip caught in the hand is not predictable in practice.

Head or tail: which should I call?

On Go Flip Coin it makes no difference. Heads and tails each have exactly a 50% chance, and there is no starting side to favour. With a physical coin, call the side that is facing up before the toss. The Bartoš study found a coin lands on its starting side 50.8% of the time, so that is the one call with a small edge.

Does Go Flip Coin work without an internet connection?

Once the page is open, yes. All the flip logic runs in your browser, so you can keep flipping if your connection drops, as long as you do not reload the page. Nothing is sent to a server and no account is required.

What is a three-way coin flip?

Flip three times and take the majority, since two matching results beat the odd one out. To pick one winner from three people, each person calls a side, everyone flips once, and whoever's result differs from the other two wins. If all three match, flip again.

Should I flip a coin 3 times or just once?

Once is enough for a genuine 50/50 choice. Flipping a coin 3 times and taking the best of three only helps if you suspect the coin or the flipper is biased. It does not change the odds for a fair coin, it just softens how much a single unlucky flip stings.