Flip a coin
Tap Flip and the coin lands heads or tails, each with exactly half the chance. Your browser’s secure random generator picks the side before the coin moves. It keeps a tally with streaks, plays best of 3 or 5, and can use your own two words.
Also on iPhone: RandALL
iPhone only for now. These web tools are yours to keep using.
Heads or Tails?
?
- Heads
- 0
- Tails
- 0
- Streak
- 0
- Best
- 0
No flips yet. They line up here, newest first.
Press Space or Enter to flip.
How to flip a coin online
- Keep heads and tails, pick Yes / No, or type your own two words.
- Tap Flip, tap the coin, or press Space.
- Read the tally, the streaks and the history. Reset starts over.
How it picks
The side is picked first. The coin only shows it.
- One random bit. When you flip, the page asks
crypto.getRandomValues, the secure random generator built into your browser, for a number and keeps its lowest bit. 0 is the first side, 1 is the second. That bit is the result, before anything moves. - An even or odd number of half turns. An even number of half turns brings a coin back to the side it started on. An odd number lands it on the other side. The coin makes 8 to 11 half turns, and the page picks an even or odd count to land on the side already drawn, whichever side it started on.
- Every flip stands alone. Nothing carries over from one flip to the next. After five heads in a row, the sixth flip is still exactly 50/50. The tally and the streaks are there to look at, not to steer anything.
- The app plays fair in 3D. In RandALL for iPhone the coin is a real 3D coin, flicked by a physics simulation. Before each flick, a fair random draw decides whether it starts turned over, so each side keeps exactly half the chance however the physics lands.
Tested. In 100,000 test flips, heads and tails came up evenly (chi-square test), whichever side the coin started on.
More tools
Questions
Is this coin flip really 50/50?
Yes. Each flip takes one random bit from crypto.getRandomValues, your browser’s secure random generator, so each side has exactly half the chance. The side is picked before the coin moves, and the animation only shows it.
Is a real coin toss 50/50?
Very nearly, but not quite. A 2023 study of 350,757 real flips found that coins land on the side they started on about 50.8% of the time. This coin has no such lean: it lands on the side that was drawn, whichever side it started on.
Why did I get the same side five times in a row?
Because streaks are normal. In 20 flips, a run of 4 or more of the same side shows up about 3 times in 4. In 100 flips, a run of 6 or more shows up about 4 times in 5. The next flip is still 50/50.
How does best of 3 work?
Pick Best of 3 and keep flipping. The first side to win 2 flips takes the match (3 flips in best of 5), and the next flip starts a new one. Each side still has exactly half the chance to win. It just takes longer, which can feel fairer.
Can I use my own words instead of heads and tails?
Yes. Tap Yes / No, or type any two words of up to 14 characters, like Pizza and Sushi. They are stamped on the coin, and the tally starts again when you change them. Your words stay in your browser.
Does it remember my flips?
Yes, in this browser only. The tally, both streaks and your last 60 flips stay on your device, so they are still there next time. They are never sent anywhere. Copy puts them on your clipboard, and Reset clears them.
Is there a coin flip app for iPhone?
Yes: RandALL, the iPhone app I make. It flips a real 3D coin, has 9 ready-made pairs like Yes or No and Stay or Go, and flips again when you shake your phone. It works offline, with 24 more tools beside the coin.
Take it with you
RandALL for iPhone has 25 tools in one app: wheels and teams, real 3D dice, random alarms, Finger Picker and more. It works offline.
Your first 24 hours are free, with every tool. After that, subscribe or buy the lifetime unlock once. Family Sharing included.
Get it on the App StoreiPhone only for now. These web tools are yours to keep using.
