How to flip a coin online
Press Flip the coin, tap the coin or press Space. The coin spins through the air and lands on heads or tails. Want it to settle a decision? Write what each side means in the boxes, for example heads for pizza and tails for burgers, and the result tells you the answer directly. Use Flip 10 times to toss ten coins in one go and see how the results spread out.
The tool counts heads and tails, shows the percentage of each, follows your current streak and lists your last flips, all saved in your browser. You can reset the statistics whenever you like.
Is a virtual coin flip fair?
Yes. Each flip is decided by your browser's cryptographic random number generator, with exactly a 50% chance of heads and a 50% chance of tails. Earlier results have no influence at all: after five heads in a row, the next flip is still 50/50.
Real coins are, surprisingly, not quite as fair. A study led by František Bartoš at the University of Amsterdam recorded 350,757 coin flips and found that coins landed on the same side they started on 50.8% of the time, close to the roughly 51% predicted by a physical model from the mathematicians Persi Diaconis, Susan Holmes and Richard Montgomery (University of Amsterdam, 2023). The bias is small, but it shows why a random number generator is the more neutral choice when the outcome matters.
Streaks are normal
People are often surprised by long runs of the same side, but streaks are a natural part of randomness. In ten fair flips, the chance of seeing at least three heads or three tails in a row is about 83%. The Flip 10 times button is a quick way to see this for yourself, and it makes a nice classroom experiment about probability.
Ways to use a coin toss
- Decide who kicks off, serves first or picks a side in a match.
- Settle a choice between two options when you cannot make up your mind.
- Break a tie in a game or a vote.
- Teach probability: flip 100 times and see how close you get to 50%.
In Arabic the two sides are usually called ملك (heads, literally “king”) and كتابة (tails, literally “writing”). Need more than two options? Try the dice roller or the random number generator.
A quick probability experiment
Coin flips are one of the easiest ways to see the law of large numbers in action. Flip ten times and write down how many heads you got: anything from three to seven is perfectly normal. Now keep flipping and watch the percentage in the statistics panel. After 100 flips it is usually within a few points of 50%, and after several hundred it gets closer still. Each single flip stays completely unpredictable, yet the long-run share settles down, which is exactly the idea behind probability.
Frequently asked questions
Is the coin flip really 50/50?
Yes. Each flip has exactly the same chance of heads and tails, decided by cryptographic randomness in your browser.
Does the last result change the next one?
No. Every flip is independent, so a long streak does not make the other side “due”.
Can I give each side my own meaning?
Yes. Type a label for heads and tails, and the result shows your label next to the side that came up.
Can I flip more than one coin?
Yes. “Flip 10 times” tosses ten coins at once and adds them all to your statistics.
What are heads and tails called in Arabic?
Usually ملك (heads) and كتابة (tails). The Arabic version of this page uses those names.
