Flip a coin online: heads or tails instantly
Flipping a coin is the oldest and most universal method for making a binary decision. The virtual coin offers the same randomness as a physical one, with the advantage of always being available on your phone or computer.
Is the digital flip truly random?
Yes. The flipper uses the browser's Math.random(), a pseudo-random generator whose output is unpredictable to the user. Every flip has exactly a 50% chance of heads and 50% of tails, regardless of previous results. There is no memory effect or accumulated bias.
Common uses
- Deciding who goes first in a game or sport.
- Breaking ties in group votes.
- Choosing between two options when there is no clear preference.
- Simulating probabilities for statistics exercises.
- Deciding who pays the bill or gets up to fetch something.
The gambler's fallacy
A very common cognitive error is believing that if heads came up five times in a row, tails is "due" next. This is the gambler's fallacy. In a fair flip each toss is completely independent; the previous result has no influence on the next.