What is it?
Coin Flip tosses a fair virtual coin for you. Tap Flip the coin for one toss, or Flip 10 and Flip 100 to see the score. Reset clears the count.
Who is it for?
Cricket and football players doing the toss, friends settling small choices, and teachers demonstrating probability.
Is it really random?
Yes. It uses your browser’s secure random number generator (the same kind used for passwords), so every result is equally likely and can’t be predicted or influenced.
Streaks are normal
In 100 flips, a run of 5 or 6 heads in a row is common. Each flip is independent: after 5 heads the next is still 50/50. Over many flips the share gets close to half, but rarely exactly 50:50.
Uses
- Cricket and football toss, who goes first in a game, settling small decisions.
- Probability lessons: compare 10 flips with 100 flips and see how the share settles.
Good to know
For a toss with a team watching, share the screen or let the captain tap. For yes/no questions, the Yes or No Decider adds a “Maybe”.
Experiment for students
- Tap Flip 10 five times and write down the heads each time; you may see 3, 6, 5, 7, 4.
- Now tap Flip 100 five times; results cluster closer to 50, like 47, 52, 49, 55, 50.
- This is the law of large numbers: more flips, closer to half.
Questions people ask
- Is a real coin 50/50? Very close, though studies suggest a tiny bias towards the side facing up at the start. A virtual coin has no such bias.
- Best of three? Flip until one side wins twice. For a fairer long contest, use Flip 10 and compare the score.
- Can I predict the next flip? No: every flip is new, whatever came before.
Related: Dice Roller · Random Number Generator
Errors and how to fix them
- Score looks uneven: short runs are rarely 50:50; that’s normal randomness. Reset clears the score.
Open the tool: Coin Flip
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Questions, or an error not listed here?
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