Risk of Ruin Explained

What risk of ruin means

Risk of ruin is the chance that a trading plan loses so much that you can no longer continue, or hit a limit you set, such as a 50% drawdown or a prop firm's maximum loss. Even a strategy with a real edge can lose many trades in a row. Ruin is what happens when your bet size is too large for the losing streaks that edge will eventually produce.

The math of recovering

Losses are harder to recover than they look, because you start the climb from a smaller balance. Down 10%, you need an 11.1% gain to get back. Down 25%, you need 33.3%. Down 50%, you need 100%. The deeper the hole, the less likely a normal run of results gets you out, which is why avoiding big drawdowns matters more than chasing big wins. Check your own numbers with the drawdown recovery calculator.

What drives the odds

Three inputs matter most: your win rate, your reward-to-risk ratio, and how much of the account you risk per trade. Raising any of the first two helps, but the third is the one you fully control. Halving your risk per trade does far more for survival than a small improvement in win rate, which is why the risk of ruin simulator lets you change it and watch the survival rate move.

Simulations, not predictions

A simulation plays your inputs over many random sequences of wins and losses. It shows the range of outcomes, including unlucky ones, instead of a single average. It does not predict the future. Real trading has changing conditions, costs and emotions, and your true win rate is an estimate. Treat the survival rate as a way to compare plans, not a promise.

Prop firm accounts and ruin

On a funded or evaluation account, ruin is defined by the firm: a trailing drawdown or daily loss limit that ends the account. That makes the room above your liquidation level your real risk budget. Use the trailing drawdown calculator to see how much room is left, and size each trade as a small slice of it. This guide is educational and not financial advice.