Browser games and pointless experiments. Nothing to install.

Flip a Coin

Heads or tails? Flip with satisfying animations

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What is an online coin flip?

A coin flip settles something with a fifty-fifty draw. This one tosses a virtual coin with a proper spin and a landing, gives you heads or tails, and keeps a running tally so you can see how the split is going across a session.

It exists because nobody carries change any more. The coin toss survived the disappearance of coins because the ritual is doing something a random number cannot: it makes the decision feel handed over to chance rather than chosen, which is the entire psychological function of the thing.

How to flip

  1. Call it before you press. Deciding after you see the result defeats the point.
  2. Press to flip. The coin spins and lands.
  3. The result and your running heads-to-tails tally are shown.
  4. Flip as many times as you like. Nothing is stored beyond the current session.

Is a virtual coin flip fair?

Each flip draws from the browser's random number generator, which produces an even split across a large number of tosses. It is fairer than a real coin, which is a genuinely surprising fact. A physical coin toss is not perfectly 50-50: research from Persi Diaconis and colleagues at Stanford found that a flipped coin has a small bias toward landing on the same face it started on, because it precesses rather than rotating cleanly about a single axis. The effect is small, in the region of 51 to 49, but it is real and repeatable.

Spinning a coin on a table is much more biased than flipping it, sometimes heavily, because the weight distribution around the rim is uneven on most coins. So if you want an honest fifty-fifty, a virtual flip is a better instrument than the physical object it imitates.

The useful trick nobody mentions

The best-known piece of advice about coin tosses is that you should notice what you are hoping for while the coin is in the air. If the result comes up and you feel a flicker of disappointment, you already knew what you wanted and the coin has done its job by surfacing it rather than by deciding anything. That is a far more common outcome than actually abiding by the result.

Other ways to decide

  • Two options: a coin flip is the right tool.
  • Three to eight options: Decide For Me spins a wheel instead.
  • A number rather than a choice: Roll Dice.
  • A question rather than an option: the Book of Answers gives you a phrase to interpret.

All of them are free, need no account, and run entirely in your browser.

Frequently asked questions

Is this coin flip truly random?

Each flip uses the browser's random number generator, which gives an even split across many tosses. It is actually fairer than a real coin, since a physical flip carries a small bias toward the face it started on.

Is a real coin toss really 50-50?

Not exactly. Research from Persi Diaconis and colleagues at Stanford found a flipped coin lands slightly more often on the face it started on, roughly 51 to 49, because it precesses in the air rather than rotating cleanly. Spinning a coin on a table is far more biased still.

Can I flip more than once?

Yes, as many times as you like, and a running heads-to-tails tally is kept for the session so you can see how the split is going.

Is it free?

Yes, with no sign-up, no account and nothing to install.

Does it work on a phone?

Yes. Tap to flip. It is designed to be held up and shown to whoever you are deciding with.

What if I do not like the result?

That reaction is the useful part. Noticing you are disappointed tells you what you actually wanted, which is often more valuable than the toss itself.