Heads 0Tails 0Flips 0
Use it for decisions and for math class
- Settle it fairly. Who goes first, which team picks, which book to read aloud.
- Teach probability. Have students predict how many heads they will get in 20 flips, then compare with the tally.
- Show the law of large numbers. Keep flipping and watch the heads percentage drift toward 50%.
More choices than two? Try the dice roller or therandom name picker.
Coin flip FAQ
How do you flip a coin online?
Click or tap the coin, press the "Flip" button, or press the space bar. The coin spins and lands on heads or tails, and the result is added to the tally.
Is a coin flip really 50/50?
This virtual coin is exactly 50/50, because each flip uses your browser's cryptographic random number generator. Real coins are very slightly biased: a 2023 study of 350,757 flips found that a coin lands on the side that started facing up about 50.8% of the time.
Can a coin land on its side?
Yes, but it is extremely rare. One physics estimate puts the chance of a U.S. nickel landing on its edge at about 1 in 6,000 tosses.
If I get heads five times in a row, is tails due next?
No. Every flip is independent, so the chance is still 50/50. Believing otherwise is called the gambler's fallacy — a great discussion starter for a probability lesson.
What are the odds of getting heads twice in a row?
One in four, or 25%. Each flip is one in two, and the chances multiply: three heads in a row is 1 in 8, and ten in a row is 1 in 1,024.
Sources
- Bartoš, F. et al. (2023). "Fair coins tend to land on the same side they started: Evidence from 350,757 flips."
- Murray, D. B. & Teare, S. W. (1993). "Probability of a tossed coin landing on edge." Physical Review E, 48(4).
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