Coin Flip
Flip a single coin for a quick decision, or flip up to a thousand at once and see how the results add up.
Este conteúdo está em inglês.
Running totals
Exemplos resolvidos
Deciding a match-up
One flip with the heads and tails labels left as default
Heads or tails, chosen at random.
Each flip is independent, so a run of heads does not make tails more likely next time.
Counting a run of flips
Ten flips in a row
Running totals showing how many heads and tails have come up since the page was opened, which will differ each time.
The totals add up every flip since the last reset, so a set of ten shows the mix over those flips.
Sobre Coin Flip
A coin flip is the simplest way to make a fair choice between two options. Press flip and the tool shows heads or tails, ready for settling who goes first, deciding which team kicks off or making a quick call on what to eat. Each flip has an equal chance of heads or tails, and no flip depends on the one before it. A coin is never due to land a certain way just because the last few results matched.
For many flips at once, choose how many you need, up to a thousand. The tool shows the heads and tails totals for that batch, the sequence of faces and running totals for everything since the page was opened. The heads share shows how close the results are to half and half. With enough flips the share settles near fifty per cent, while short runs can look lopsided, which is a useful lesson in chance. Reset the running totals whenever you want to start a fresh experiment.
Como usar Coin Flip
- Enter how many flips you want, or leave it at one for a single flip.
- Select Flip to see heads or tails, or the totals for a batch.
- Read the sequence and running totals to see how the results add up.
- Select Reset running totals to start a fresh count.
Usos comuns
- Deciding who goes first in a game or a turn
- Making a quick choice between two options
- Teaching children about chance and probability
- Running a simple experiment to see how results settle over many flips
Perguntas frequentes
Is a coin flip really fair?
A real coin is very close to fair, and this tool gives each side an equal chance on every flip. The result is drawn from a high-quality random source, and any draw that would favour one side is thrown away and drawn again. Over a large number of flips, heads and tails tend to come up in roughly equal numbers, although short runs can look uneven.
What does the heads share mean?
The heads share is the number of heads divided by the total number of flips, shown as a percentage. After ten flips it can be far from fifty per cent, and it becomes steadier as the total grows. It is a simple way to see how results settle over time. The figure starts again from zero when you press reset running totals.
Does a run of heads make tails more likely?
No. Each flip is independent, so the coin has no memory of earlier results. After five heads in a row, the chance of the next flip being tails is still one in two. Many people expect a switch after a streak, but that expectation is a common misunderstanding of chance, and the running totals show how normal long streaks really are.
Why are only 300 flips shown?
Showing every flip from a batch of a thousand would make the page long and hard to read, so the sequence shows the first 300 flips and says how many were made. The heads and tails counts and the running totals always include every flip in the batch, so the summary is still complete even though the sequence is shortened.
Do the running totals include earlier visits?
No. The running totals cover the flips made since the page was opened, or since you last pressed reset. Refreshing the page starts the count again, so note down any totals you need to keep before you leave. Each batch you flip adds to the running totals, so you can build up a larger sample over several sessions on the same page.