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Work out exactly how many units to buy so a losing trade costs only what you decided to risk. Position size = (account × risk %) ÷ (entry − stop distance).
Position sizing is the single most important habit that separates traders who last from those who blow up. Instead of guessing how much to buy, you decide the dollar amount you're willing to lose first, say 1% of your account, then size the trade so that hitting your stop-loss loses exactly that and no more.
The maths: risk $ = account × risk %. Units = risk $ ÷ distance from entry to stop. A wider stop means a smaller position; a tighter stop means a larger one, but your dollar risk stays fixed either way. That's the whole point: your losses are planned, not a surprise.
Risking a small, fixed percentage is what lets you survive a losing streak. Risk 1% and you can be wrong many times in a row and still have an account. Risk 20% and a few bad trades end you.
Learn risk management properly, free on Chartilo