How to use Coin Flip
Enter the number of flips and the result appears straight away. Everything runs in your browser, so nothing you type is uploaded.
How it works
Each flip uses the browser's cryptographically secure random generator.
Examples
- A single flip (sample result)
Heads
- Ten flips (sample result)
Heads: 6 (60.0%) Tails: 4 (40.0%)
- One hundred flips (sample result)
Heads: 47 (47.0%) Tails: 53 (53.0%)
Limitations and assumptions
Each flip is independent with a 50% chance of heads.
Frequently asked questions
Is the online coin flip fair?
Yes. Each flip is an independent 50/50 outcome from a cryptographic random source.
Why am I not getting exactly half heads in many flips?
Randomness produces streaks and uneven counts in small samples. The proportion approaches 50 percent only over very many flips.
Does a streak of heads make tails more likely?
No. Every flip is independent, so past results do not change the next one.
Can I use it to settle a decision?
Yes. Agree beforehand which side means what, then flip once.