Most people who quit trading don't quit because they can't read a chart. They quit because one oversized trade took a chunk they couldn't recover from. The fix isn't a better indicator — it's position sizing, and it's arithmetic, not art.
The one rule
Never risk more than ~1% of your account on a single trade.
Risk doesn't mean the dollar amount you put in — it means the amount you lose if your stop-loss hits. Those are completely different numbers, and confusing them is the whole problem. You can put $5,000 into a trade and only risk $100, if your stop is close. The distance to your stop sets your size — not a round number, not how confident you feel.
The math, once
Three steps:
- Risk budget = account × 1%. On a $10,000 account, that's $100. This is the most you'll lose if you're wrong.
- Stop distance = how far, in dollars, from your entry to your stop-loss.
- Position size = risk budget ÷ stop distance.
That's it. A tight stop lets you hold a bigger position for the same risk; a wide stop forces a smaller one. The 1% stays fixed — the size flexes around it.
Play with the numbers below. Move the stop closer to the entry and watch the position size grow, while your risk budget never moves off $100. That's the point: the stop drives the size.
Why 1%
Because losing streaks are normal, not exceptional. At 1% risk per trade, ten losses in a row — a genuinely bad run — costs you about 10% and you trade on. At 10% risk per trade, that same streak is a 63% drawdown, and now you need to nearly triple your remaining money just to get back to even. The 1% rule isn't timidity; it's what keeps a bad week from becoming the end.
Amateurs think about how much they can make on a trade. Professionals think first about how much they can lose — and size so that being wrong is survivable, every single time.
You've now got the three pillars: a direction (moving averages), a momentum read (RSI/MACD divergence), and a size that keeps you alive. Put them together on paper — no risk, real prices — before you ever use real money.
In the lab
Numbers stick when they're your numbers. Work the sizing calculator with your own account size, then put the stop on the chart where you can see what it costs.