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Coin Flip: Heads or Tails Online

This free coin flip tool settles a decision with a fair heads or tails. You can also flip up to a thousand coins at once to see how heads and tails split, and the longest streak.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is It and When Do You Need It?

A coin flip is the simplest fair way to decide between two options. Referees use it to choose ends, friends use it to choose a film, and teachers use it to show probability.

Flip one coin for a quick answer, or flip many to see how chance behaves.

How to Use This Tool

  1. Enter how many coins to flip (1 for a single flip).
  2. Optionally name heads and tails.
  3. Press Flip.
  4. Read the result and, for many coins, the counts.

How the Calculation Works

Each flip uses an unbiased random bit, so heads and tails each have a 50% chance, independent of earlier flips. The tool counts heads and tails and finds the longest run of the same result.

Worked Example

Flipping 10 coins might give 6 heads and 4 tails, with a longest streak of 3. Flipping 1,000 usually gives between 470 and 530 heads.

Common Uses

  • Making small decisions.
  • Starting games and sports.
  • Teaching probability.
  • Breaking ties.

Tips and Common Mistakes

  • Each flip is independent: past results do not change the next.
  • Name the sides for decisions.
  • Flip many coins to see the law of large numbers.

Next, you may need the dice roller, magic 8 ball, random number generator, random name picker.

Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.

Frequently Asked Questions

Yes. Each flip has an exactly equal chance of heads or tails, using your browser’s secure random source.
Yes. Type a label for heads and tails, such as two restaurants, to make a decision.
Random does not mean even. In 100 flips you will often see 45 to 55 heads. The split gets closer to half as you flip more.
A run of the same result in a row. The longest streak in 100 flips is often six or seven.

Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.