Coin Flip

By Seagit ✨
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Flip a fair coin online, one flip or hundreds

Flip the coin

How fair is a coin flip?

A fair coin gives heads and tails with probability 0.5 each, and every flip is independent of the ones before it. Across many flips the share of heads settles near 50%, but short runs can look lopsided: in 10 flips, getting 7 or more heads happens about 17% of the time. Each flip here comes from one unbiased bit of the browser's cryptographic random generator, so the result is not predictable from earlier flips.

🪙 Coin Flip — Free Online Tool

Flip a coin online, one flip or hundreds, with heads and tails counts. This online coin flip gives a fair heads or tails result, for one flip or up to 1,000 at once. The tool shows each result, the number of heads and tails and their percentages, so you can settle a choice or run a quick simulation. Every flip is one unbiased bit from the browser’s cryptographic random number generator. Nothing is sent to a server.

How to use it

  1. Enter how many coins to flip, from 1 to 1,000.
  2. Click Flip.
  3. For one flip, read Heads or Tails.
  4. For several flips, read the counts and the share of heads.

🚀 Why use this Coin Flip tool?

A coin flip is the simplest fair choice, with a 50% chance each way. Across many flips, the counts show how close to 50% a run actually lands. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.

Key Features

🪙One flip or many

Heads or Tails for a single flip, or up to 1,000 flips at once.

📊Counts and percentages

Heads, tails and their shares, with the full sequence of results.

⚖️Fair 50/50

Each flip uses an unbiased bit, so each side has probability one half.

🔒Private

Runs in the browser. Nothing is stored or sent.

Popular Use Cases

Decisions and games

  • • Settle a choice between two options
  • • Decide who goes first
  • • Break a tie in a game

Statistics and teaching

  • • Show the law of large numbers
  • • Simulate a binomial experiment
  • • Compare runs with expectation

Sport and play

  • • Pick a side or a map
  • • Decide a kickoff
  • • Simulate a random event

What It Handles

Flips

  • ✓ One flip or up to 1,000
  • ✓ Heads or tails per flip
  • ✓ Each flip independent

Results

  • ✓ Heads and tails counts
  • ✓ Percentages to two decimals
  • ✓ Full sequence shown

Method

  • ✓ crypto.getRandomValues
  • ✓ Unbiased bits
  • ✓ Runs in the browser

Related Tools

Sources & References

Frequently Asked Questions

Is an online coin flip really fair?

It is as fair as the browser’s cryptographic random source, which is designed to be unpredictable and unbiased. It is not a physical coin, but the 50/50 odds are built into each flip.

How many flips can I do at once?

Up to 1,000 flips in one go. For a single decision, one flip is enough.

Why do my counts not split exactly 50/50?

Random flips rarely split perfectly. In 100 flips the heads share usually falls between 40% and 60%, and an exact 50/50 split is less likely than a result close to it.

Does a run of heads make tails more likely next?

No. Each flip is independent. A run of heads does not make tails more likely next time. Believing it does is the gambler’s fallacy.

Is anything stored?

No. Results exist only on your screen while the page is open.

🎓 Pro Tips

  • Tip 1: Flip 1,000 times to watch the share of heads settle near 50%.
  • Tip 2: Long streaks are normal. In 100 flips a run of six or more of one side is common, so do not read a streak as a sign of bias.
  • Tip 3: A coin flip gives a 50/50 choice. For a weighted choice, use a wheel or a random number with a range that matches the weights.
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