How to use the coin flip
- Choose how many coins to flip, from 1 to 100, then press Flip. One coin shows a large coin face. Several coins show a row of small coins and a count of heads and tails.
- Read the result under the coins. Each press adds to the running tally: total flips, heads, tails, the share of heads, the current run, and the longest run of each side.
- Look at Recent flips to see the last 60 results in order, with H for heads and T for tails. Letters are used as well as color, so the trail reads without color vision.
- Press Copy tally to copy a one-line summary, or Reset tally to start over. Nothing is saved when you leave the page.
How the flips are generated
Every coin is decided by one draw from your browser's secure random number generator, the same source used for password tools. The draw gives a 32-bit number, and the coin is heads when that number is even and tails when it is odd. Because 2 to the 32nd power divides evenly by 2, no number has to be thrown away and neither side gets even a tiny edge.
The animation is only decoration. The result is chosen first and the spin is drawn afterward, so pressing the button twice quickly, resizing the window or turning animation off never changes the odds. If your system is set to reduce motion, the coin appears without spinning.
Flips are independent. A coin that landed heads five times in a row is still exactly as likely to land heads on the next flip as tails. The tool shows streaks because people enjoy them, not because they predict anything.
What a tally can and cannot tell you
In a fair simulation the share of heads drifts toward 50 percent as flips accumulate, but slowly and unevenly. After 10 flips, exactly 5 heads happens 252 times out of 1,024 equally likely sequences, which is about 24.6 percent of the time. Splits such as 6 and 4 or 7 and 3 are ordinary. A run of 5 identical results in 5 flips has a chance of 1 in 32, or 3.125 percent, on any given set of 5 flips.
Those figures describe the idealized fair coin that this tool simulates. A real coin tossed by hand can differ slightly depending on how it is flipped and caught, and this page makes no claim about any physical coin. Use it when you need a quick, fair, either-or decision, a classroom probability demonstration, or a stand-in for a coin you do not have.
Flipping many coins at once
Set the number of coins to 10, 50 or 100 to see how counts spread out in a single press. The summary line tells you how many heads and tails appeared, and the tally keeps adding across presses, so you can build up hundreds of flips in a few clicks. The longest-run numbers count across your whole session, in the order coins were shown from left to right.
For choices with more than two outcomes, use the wheel spinner or the random number generator. To pick people from a list, try the random name picker.
Assumptions and limits
- The coin is an ideal fair coin: each side has exactly a 1 in 2 chance on every flip, and flips do not influence each other.
- Results come from your browser's secure random generator. This is suitable for casual decisions and teaching, not for gambling, lotteries or anything regulated.
- The tally exists only in this tab. Reloading the page or pressing Reset clears it, and nothing is sent to a server.
- The tool flips between 1 and 100 coins per press, and the trail shows only the most recent 60 results.
Frequently asked questions
Is this coin flip really 50/50?
Yes, in the sense that matters for the simulation. Each flip uses one secure random draw that is split exactly in half, so heads and tails are equally likely and no flip depends on the one before it. The page does not claim anything about physical coins.
Why did I get so many heads in a row?
Streaks are normal in fair random sequences. Five heads in a row has a chance of 1 in 32 for any five flips, so over many flips you should expect to see runs like that now and then. A streak does not make the next flip more or less likely to be tails.
Can I flip more than one coin at a time?
Yes. Enter any number from 1 to 100 and press Flip. Each coin is flipped separately, the page reports how many heads and tails appeared, and every coin is added to the running tally and to the longest-run counts.
Does the spinning animation affect the result?
No. The result is picked before the animation starts and the spin is drawn afterward. People who set their device to reduce motion see the coin without spinning, and the odds are identical either way.
Is my history stored anywhere?
No. The tally stays in this browser tab and disappears when you reload, close the tab or press Reset. Nothing is saved on the device or sent to any server.