About the Coin Flip
A quick, fair coin toss for settling a decision. Flip once for heads or tails, or flip many times to see the split, which is a neat demonstration that a fair coin still clusters in the short run. It uses the browser's secure random source, so each flip is genuinely 50/50.
Flipping in bulk shows two things people usually get wrong. The proportion does settle near half as the count grows, but the absolute gap between heads and tails tends to widen, so a thousand flips landing on 516 heads is perfectly ordinary rather than evidence of a loaded coin. Streaks are the other one. A run of five identical results turns up in most sequences of a hundred flips, and it says nothing whatever about the next flip, which remains an even chance. The coin has no memory of what it just did.
Use it to decide who goes first, to break a deadlock in a planning session, or to produce a quick sequence of random bits for a demonstration or a probability lesson. For choices with more than two outcomes, the Random Picker chooses from your list, the Dice Roller gives a numbered result, and the Random Number Generator covers any range you name.
How to use
- Set how many flips.
- Press Flip.
- Read the result, or the heads and tails counts for many flips.
Common questions
- Is the coin fair?
- Yes, each flip is an independent 50/50 using a secure random source.
- Why do many flips not split exactly evenly?
- Randomness clusters in the short run. The split approaches 50/50 as the number of flips grows.
- Can I flip more than two options?
- Use the Random Picker for a list of choices.