Coin Flip
Flips one coin or a thousand, with the count of heads and tails and the longest run.
Results
What this tool does
A coin settles an argument because nobody controls it, and a coin on a screen only settles it if the person on the other side believes it. That is what the seed is for: it is written down with the result, so the same flip can be repeated and checked afterwards. Flip several at once and the statistics underneath show how far a real sequence wanders from the tidy alternation people imagine randomness looks like.
Formula
each toss is heads if the drawn number is below 0.5
Variables
| Symbol | Meaning | Unit |
|---|---|---|
count | How many | — |
seed | Seed | — |
OUT | Tosses | — |
HD | Heads | — |
TL | Tails | — |
HP | Share of heads | % |
LR | Longest run | — |
Worked example
- How many1
- Seed2026
- TossesH
- Heads1
- Tails0
- Share of heads100.00 %
- Longest run1
Limitations
- The calculation runs entirely in your browser. The values you type are never sent to a server.
Frequently asked questions
Ten heads in a row — is it broken?
Almost certainly not. A run of ten happens once in every 1024 sequences of ten, so in a thousand flips you should expect to see one. People are far worse at recognising real randomness than they think: a sequence that alternates neatly looks random and is not, and a long run looks rigged and is exactly what chance produces. The longest run is shown for that reason.