Understanding Position Sizing Beyond 'X% of Account'

We often hear the simple rule: "Don't risk more than X% of your account on any single trade." While conceptually sound, it's frequently misapplied. True position sizing isn't just about a percentage; it's about defining your stop-loss level first, then calculating how many units of the asset you can buy or sell to ensure that if the price hits your stop, you only lose that predetermined percentage of your account. For example, if you want to risk 1% of a $10,000 account ($100), and you're trading $NG with a stop 50 cents away from your entry (e.g., entering at 5.9 and stopping at 5.4), you'd buy 200 units ($100 / $0.50 loss per unit = 200 units). This approach ensures your capital preservation isn't just a hopeful guideline, but a mathematical constraint on your exposure.