ForgeXRisk and position sizing
Position sizing, explained without the jargon
How to work out how much to trade. The percent risk method, the maths behind it, and why sizing decides survival more than entries do.
Position sizing is how you decide how big a trade should be. It gets less attention than entries and it matters more, because it is what decides whether a bad run costs you a month or your account.
The method almost everyone should use
Pick a percentage of your account you are willing to lose on one trade. Then work out the position size that loses exactly that much if your stop is hit.
The calculation is one line. Risk amount divided by the distance to your stop, divided by the value of one point.
Example. You have 25,000 and risk 1 percent, so 250. Your stop is 30 points away. Each point is worth 10 per contract. 250 divided by 30 divided by 10 is 0.83 contracts.
Why it is a percentage and not a fixed amount
A percentage shrinks your size as you lose and grows it as you win. That is the behaviour you want, and it is automatic.
Risking a fixed 250 on a 25,000 account is 1 percent. After a drawdown to 15,000 it is 1.7 percent, so you are taking more risk exactly when you can least afford it.
What percentage to use
Between 0.5 and 2 percent is the range most traders should live in. One percent is a reasonable default.
The right number depends on how confident you are in the edge and how many trades you take. If you are still testing, size at the bottom of that range. Uncertainty belongs in your size, not in your hope.
Above 2 percent, ordinary losing runs start doing damage you cannot easily recover from. The arithmetic of that is in the risk of ruin guide.
Sizing needs a stop to exist
You cannot size a trade without knowing where you are wrong, because the stop distance is half the calculation.
This is why a trade with no stop is not a small risk or a large risk. It is an unmeasured one, and it cannot be sized at all.
It is also why the ForgeX Daily Challenge requires a stop on every trade. Without one there is no honest way to cap risk at 3 percent, or at any number.
The mistake that undoes all of it
Sizing up after a losing trade to win it back. It feels like a way to get even and it is the most reliable way to turn a bad day into a bad month.
If your size changes based on your last result rather than your plan, it is your feelings choosing your risk. The fix is to decide size before the session, not during it.