Position sizing & risk per trade
How much to bet so no single loss can sink you
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Beginners ask “what should I trade?” Pros ask “how much?” This is the quieter question — and it decides whether you’re still here next year.
Picture two traders who make the exact same calls all year — same entries, same exits, same win rate. One ends up richer. The other blows up in month three. The only thing that differed was how much each put on the line per trade.
That’s position sizing. It’s not glamorous, nobody posts about it, and it quietly matters more than any indicator you’ll ever learn. Because you can be right about the market and still go broke if you bet too big at the wrong moment.
Pick the direction and you might win a trade. Pick the size and you get to keep playing.
Your job in year one isn’t to get rich — it’s to survive long enough to get good. Sizing is the seatbelt that keeps you in the car.
The 1% rule
Here’s the guardrail almost every professional leans on: never risk more than about 1% of your account on a single trade. Not 1% invested — 1% at risk if the trade goes completely against you.
On a $10,000 account, that’s $100 of risk per trade. Feels tiny, right? That’s the entire point. If you lost ten trades in a row — a genuinely awful streak — you’d still only be down about 10%. You’d be bruised, not buried, and free to keep trading.
One percent looks almost too cautious — and that’s exactly why it works. Boring bet sizes survive rough patches. Heroic ones get one bad week and vanish.
Contrast that with the trader who risks 25% a swing. Four losses — completely normal in trading — and the account is gone. Same market, wildly different fate, decided entirely by size.
Bought options do half the work for you
Here’s a gift the options world hands you. When you go long a call or put, the premium you pay is your maximum loss. You literally cannot lose more than that, no matter how badly the trade goes.
That makes sizing beautifully simple: your premium is your built-in stop-loss. So you just pick a position where the total premium fits inside your risk budget.
Account is $5,000 → 1% risk is $50. A contract costs $50 → you buy exactly one. If it costs $120, this trade doesn’t fit your budget, so you skip it or find a cheaper strike. Simple.
Notice the direction of the logic. You start from the account, decide the risk, then let that decide the position. You never start with “I want to buy ten contracts” and work backward — that’s how the budget ends up serving the trade instead of protecting you.
Size first, direction second
Every position you take should shrink one number to a size you can shrug off: your worst-case loss. When no single trade can meaningfully hurt you, a losing streak becomes a stat instead of a catastrophe — and a nasty drawdown stays a dip, not a death.
There is no sure thing. The moment you dump your whole account into one “can’t-miss” trade, you’ve handed a single roll of the dice the power to end your career. Sizing exists precisely so it can’t.
Risk small, live long, compound. The trader still standing at the end wins almost by default. Next up: once you’re in a well-sized trade, how do you actually get out of it? 🎓