Coin Flip
Flip a virtual coin once or thousands of times. Uses cryptographically secure randomness for fair outcomes.
Flip a coin
Click Flip to start.
Frequently Asked Questions about the Coin Flip
Is the coin flip truly random?
Yes. It uses your browser's cryptographically secure random source (Web Crypto API), suitable for fair decisions.
What is the probability of heads or tails?
Each flip is 50/50 (0.5 probability each). Over many flips the actual ratio approaches 50/50 but small samples can vary widely.
How many flips show the law of large numbers?
After 1,000 flips you usually see heads-rate within 47-53%. After 10,000 it tightens to roughly 49-51%. Try it with a large count to see.
Can I do best-of-three?
Set the number of flips to 3. Whichever side comes up more wins.