ForgeXRisk and position sizing
Risk of ruin, and the drawdown you should expect
Even a winning strategy can lose everything at the wrong size. Here is what risk of ruin means, what drives it, and how to keep it near zero.
Risk of ruin is the chance that you lose so much you cannot carry on, even though your strategy is profitable over time. It is decided by three things and only one of them is your entries.
What drives it
Three things. How often you win, how big your wins are compared to your losses, and how much you risk per trade.
The third one has the most power, and it is the one entirely under your control.
Why size matters more than you think
Losses do not undo each other in a straight line. Lose 10 percent and you need 11 percent to get level. Lose 50 percent and you need 100 percent. The hole gets steeper the deeper it goes.
So a strategy that is clearly profitable can still ruin an account, purely by being traded too large through a normal bad stretch.
A worked example
Say you win 50 percent of the time and your winners are twice your losers. That is a good strategy.
At 1 percent risk per trade, a run of ten losses costs you about 10 percent. Uncomfortable, survivable, and you carry on.
At 10 percent risk, the same ten losses take about 65 percent of the account. You now need to nearly triple what is left to get back, and most people stop trading long before that.
The strategy did not change between those two examples. Only the size did.
How to find your own number
Take your list of past trades, shuffle them, and add them up. Do it thousands of times and record how many of those runs would have hit a level you could not come back from.
That share is your risk of ruin, measured on your own trading rather than a formula. This is what ForgeX runs behind the Vektor equity chart, and the honest use of it is to lower your size until the number stops frightening you.
The practical rule
Keep risk per trade at or under 1 percent while you are still finding out whether the edge is real, and do not go above 2 percent after that.
It feels slow. Slow is the point. The traders who last are not the ones who found the best entries. They are the ones who were still trading after the bad stretch.