Flip a Coin

Each toss calls your browser's built-in Math.random generator. Values below 0.5 land on heads and the rest on tails, so heads and tails each get very close to an even share over many flips. It is well suited to everyday decisions and games, though it is not a certified cryptographic source.

A fair coin is 50 percent heads and 50 percent tails on every single flip. Each toss is independent, so a long streak of heads does not make tails any more likely on the next one.

You can flip one at a time by tapping the coin or pressing Flip coin, or ten at a time with Flip 10. There is no field for a custom count, so for larger batches press Flip 10 repeatedly and the tally keeps adding up.

Every flip, whether single or part of a batch of ten, is added to the running total. The panel shows heads, tails, each as a percentage rounded to one decimal, and a bar splitting the two colors by proportion.

Percentages are rounded to one decimal place. With three flips a two to one split shows as 66.7 percent and 33.3 percent, which add to 100 after rounding but are not whole numbers because the underlying fractions are not.

No. The count lives only in the current page session in memory. Reloading, closing the tab, or pressing Reset clears it back to zero heads and zero tails.

Yes. Every flip and the whole tally run locally in your browser. Nothing is uploaded to a server and no results are stored between visits.

Tails. The rule is that a value strictly below 0.5 is heads, so the exact boundary of 0.5 counts as tails. In practice hitting exactly 0.5 is vanishingly rare and does not skew the balance.

Use the dice roller for six-sided rolls or the random number generator to pick a value from a range. A coin flip is the two-outcome case of the same idea.