Coin Flip
Simulate one or more fair coin flips with an even 50% chance of heads or tails.
Free online coin flip. Flip one or many fair coins with an exact 50/50 chance, see heads and tails counts, percentages and history.
How it works
The Coin Flip simulates one or many fair coin flips with an exact 50/50 chance of heads or tails. Press Flip Coin for a single toss, or use Flip 10 Times and Flip 100 Times to simulate many flips at once and watch the statistics update.
Each flip draws from your browser’s Web Crypto API — the same cryptographically secure randomness used across the site. A single random bit decides the outcome: one value means heads, the other means tails. Because there are exactly two equally likely outcomes, the probability of heads is precisely 50% and the probability of tails is precisely 50%, on every single flip.
A key property of fair randomness is independence: previous flips never change the odds of the next one. If you flip ten heads in a row, the eleventh flip is still exactly 50/50. This contradicts the common gambler’s-fallacy intuition that tails is “due”, but it is the mathematical truth. The live statistics panel shows your running heads and tails counts and percentages, which over many flips converge towards 50/50 — a nice demonstration of the law of large numbers.
The optional animation makes a single flip feel like a real toss, but you can turn it off for instant results. History is saved on your device so you can review past flips, and you can clear it at any time.
Examples
- Making fair decisions. Flip a coin to choose between two equal options without bias or argument.
- Settling disputes. Use a fair flip to resolve a friendly disagreement about who is right or what to do.
- Starting games. Flip to decide which team or player goes first in a match or board game.
- Teaching probability. Flip 100 times and compare the heads/tails split to demonstrate independence and the law of large numbers.
- Yes/no by heads/tails. Assign heads to yes and tails to no, then flip for a quick, fair binary decision.
Common uses
- Games
- Sports
- Quick decisions
- Teaching probability
Fairness and privacy
Every flip has an exact 50% chance of heads and 50% chance of tails, drawn from secure browser randomness. Each flip is independent — past results never change the odds of the next one. Over many flips, the counts converge towards 50/50.
Random results are generated locally in your browser using secure browser randomness (Web Crypto crypto.getRandomValues()) where supported, with equal probability for every valid entry. No account is required, your lists are processed in the browser and never uploaded, names are not sent to analytics, and optional history stays only in your local browser storage. This tool is not for regulated gambling or official lotteries.
Frequently asked questions
Is the coin flip fair?
Yes. Every flip has an exact 50% chance of heads and 50% chance of tails, drawn from secure browser randomness. Each flip is independent of every other flip.
Why is this tool fair?
A single secure random bit decides each outcome, giving exactly two equally likely results. No history is kept that could bias future flips, and the animation only displays the already-decided result.
After several heads, is tails more likely?
No. This is the gambler’s fallacy. Each flip is independent, so the chance of tails is always exactly 50%, no matter what happened before.
Can I flip many coins at once?
Yes. Use Flip 10 Times or Flip 100 Times to simulate many tosses instantly and update the heads/tails statistics in one step.
How accurate are the results?
Over many flips, the heads and tails percentages converge towards 50/50 — the law of large numbers. Small samples can be unbalanced, which is normal and expected.
Can I use this to decide who goes first in a game?
Yes. A single fair flip is a classic, unbiased way to decide which team or player starts.
Are my flips stored or uploaded?
No. Everything runs in your browser. Optional history stays only on your device and can be cleared at any time.
Is this tool free?
Yes, completely free with no registration, on any device.
Can I use it for an official lottery?
No. It is for entertainment, education and ordinary low-stakes decisions, not regulated lotteries or gambling.
Does a previous flip affect the next one?
No. Each flip is completely independent. A streak of heads never makes tails more or less likely.
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