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So funktioniert es
Position sizing is the single most important risk-management decision in trading: it determines exactly how much you stand to lose if a trade hits its stop-loss, regardless of how confident you feel about the setup. Risk-based position sizing works backwards from the amount you are willing to lose — a fixed percentage of your account balance — rather than picking a lot size first and hoping the loss is tolerable. The calculation combines three inputs: your account balance, the percentage of it you are willing to risk on this one trade, and your stop-loss distance in pips. From those, the position size (in lots) is risk amount ÷ (stop-loss pips × pip value per lot) — so a wider stop naturally produces a smaller position size, and a tighter stop allows a larger one, while the dollar amount at risk stays constant. Most professional traders risk a small, consistent fraction per trade — commonly 0.5% to 2% — specifically so that a losing streak, which happens to every strategy eventually, erodes the account slowly enough to keep trading rather than forcing a blow-up.
Rechenbeispiel
Suppose your account balance is $1,000, you are willing to risk 1% per trade, your stop-loss is 20 pips away, and you are trading EUR/USD (pip value $10 per standard lot). Risk amount = balance × risk % = $1,000 × 1% = $10 Position size (lots) = risk amount ÷ (stop pips × pip value per lot) = $10 ÷ (20 × $10) = 0.05 lots So a 20-pip stop on a $1,000 account risking 1% calls for a 0.05-lot position (half a mini lot) — if the stop is hit, the loss is exactly the $10 (1%) you decided on in advance, no more.
This calculation assumes your stop-loss is filled at exactly the price you set — in fast-moving or illiquid markets, slippage can fill a stop at a worse price than planned, so the actual loss on a losing trade can exceed the risk amount calculated here. It also does not account for spread or commission, which add a small additional cost on top of the position's stop-loss risk.
Häufige Fragen
What is risk-based position sizing?
It is a method of sizing a trade from the amount of money you are willing to lose (a fixed percentage of your account) and your stop-loss distance, rather than picking a lot size first. The formula is risk amount ÷ (stop-loss pips × pip value per lot).
How much of my account should I risk per trade?
Most experienced traders risk a small, consistent 0.5% to 2% of their account per trade. Risking more increases the chance that a normal losing streak — which happens to every strategy — does lasting damage to the account.
Why does a wider stop-loss mean a smaller position size?
Because the dollar amount at risk is fixed by your chosen risk percentage, a wider stop (more pips between entry and stop) has to be paired with fewer lots so that hitting the stop still only loses the same fixed dollar amount.
Does position sizing guarantee I won't lose more than I planned?
No — it sets the loss if your stop-loss order fills at the price you set, but slippage during fast or illiquid markets can fill a stop at a worse price, meaning the realised loss can exceed the calculated risk amount.
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