Coin Flip
Flip a virtual coin: heads or tails.
How to use this tool
- Enter number of flips in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your result and the full breakdown beneath it.
Flip a virtual coin: heads or tails.
How it works
The Coin Flip tool simulates flipping a fair coin and returns Heads or Tails for each flip. You can flip one coin or several at once by entering the number of flips you want.
A virtual coin flip is ideal for quick binary decisions, resolving ties, assigning teams, or any situation where you need an impartial 50/50 outcome and no physical coin is available. Unlike a real coin flip, the result cannot be influenced by grip or technique.
Each flip is generated using the browser's secure random number source, giving Heads and Tails an exactly equal 50% probability on every flip. Flips are independent — a run of Heads does not make Tails more likely on the next flip (the gambler's fallacy).
Enter the number of flips and click Flip. All results are displayed, along with a summary count of Heads and Tails in the batch.
Worked examples
Decide which team bats first in a casual baseball game
- Set Number of flips to 1.
- Click Flip.
- The team that called their side (Heads or Tails) before the flip takes the result.
Result: Heads — the team that called Heads bats first.
Run 10 flips to demonstrate probability in a class
- Set Number of flips to 10.
- Click Flip.
- Count the Heads and Tails in the results.
- Repeat several times to show that results cluster around 5/5 over many trials.
Example output: 6 Heads, 4 Tails — close to the expected 50/50 split.
Common mistakes to avoid
- Interpreting a short-run imbalance (e.g., 7 Heads in 10 flips) as evidence the coin is unfair — small samples naturally vary.
- Using multiple flips to decide a single binary outcome without agreeing on a decision rule (majority? first result?) before flipping.
- Assuming past results affect future flips — every flip is independent.
Key terms
- Fair coin
- A coin where each side has exactly 50% probability of landing face up on any given flip.
- Gambler's fallacy
- The mistaken belief that past random outcomes influence future ones. Each coin flip is independent of all previous flips.
Frequently asked questions
- Is each flip truly 50/50?
- Yes. The tool generates a cryptographically random bit for each flip, giving each outcome exactly equal probability.
- Can I flip more than 100 coins at once?
- Yes, you can flip as many coins as you need. All results are displayed in the output.
- Does a long streak of Heads mean Tails is due?
- No. Every flip is independent. The probability of Tails on the next flip is always 50%, regardless of any streak.