Risk per trade explained: position sizing definition
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
Risk per trade is the fixed percentage of account equity a trader is willing to lose if a single position hits its stop. Most institutional desks cap it between 0.25 and 1 percent of equity, sizing the position so that the distance from entry to stop, multiplied by contract size, equals that fixed loss budget.
What is risk per trade?
Risk per trade is a position sizing rule that defines, in advance, the maximum monetary loss permitted on any single position, expressed as a percentage of current account equity. It is not the notional size of the trade, nor the margin used, but the cash that disappears if price reaches the protective stop. The figure is recalculated as equity changes, so risk shrinks during drawdowns and expands during winning runs. This convention separates account risk from market risk and is the foundation of every formal risk framework used by hedge funds, prop desks and disciplined retail traders.
How traders use risk per trade
Retail traders typically fix risk per trade between 0.5 and 1 percent of equity, then derive position size from the stop distance. The formula is simple: account equity multiplied by risk percent, divided by stop distance in price, gives the units to trade. A trader with ten thousand in equity, risking one percent on a stop fifty pips away in EUR/USD, sizes to two dollars per pip. Institutional desks tend to run tighter caps, often 0.25 percent, because they hold multiple correlated positions and must respect aggregate book risk. Professionals also recalculate after each closed trade, ensuring the percentage stays anchored to current equity rather than starting capital, which forces natural deleveraging through losing streaks.
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Worked example of risk per trade
Consider a twenty thousand pound account with a one percent risk per trade rule. The cash at risk on any setup is two hundred pounds. If the trader identifies a GBP/USD short with entry at 1.2700 and a stop at 1.2750, the stop distance is fifty pips, or 0.0050. Dividing two hundred pounds by 0.0050 gives forty thousand units of position size, roughly 0.4 standard lots. If the stop is hit, the loss is two hundred pounds, exactly one percent. After the loss, the next trade is sized against nineteen thousand eight hundred, so risk falls to one hundred and ninety eight pounds.
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Frequently asked
What is a sensible risk per trade for a retail forex account?
The desk views 0.5 to 1 percent of equity as the standard range for discretionary retail traders. Below 0.25 percent, the strategy struggles to compound meaningfully relative to fees and spread. Above 2 percent, a routine losing streak of five or six trades produces a drawdown deep enough to damage decision making. The exact figure should reflect strategy win rate, average reward to risk ratio and how many positions are held concurrently.
Should risk per trade be based on starting capital or current equity?
Current equity is the professional standard. Sizing against current equity means losses automatically shrink subsequent position sizes, which dampens drawdowns, while gains scale exposure organically. Sizing against starting capital creates a fixed cash risk that grows as a percentage of a shrinking account, accelerating ruin during losing streaks. Most trading platforms allow the account balance to be queried directly, making dynamic calculation straightforward.
How does risk per trade interact with correlated positions?
Risk per trade controls single position exposure but ignores correlation. A trader long EUR/USD, GBP/USD and AUD/USD at one percent each is effectively risking close to three percent on a single dollar move, because the three pairs trade together. Disciplined desks impose a portfolio cap, often two to three percent total open risk, and reduce individual sizes when adding correlated positions. Ignoring this turns a sensible per-trade rule into a hidden concentration bet.
Does risk per trade change with strategy type?
Yes. Scalpers using tight stops and high frequency typically reduce risk per trade to 0.1 or 0.25 percent because cumulative daily exposure across many trades is what matters. Swing traders holding positions for days at one to two percent risk per trade can be appropriate, given lower trade count. Systematic strategies often size by volatility target rather than fixed percent, but the underlying principle of bounded single trade loss is identical.
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Educational analysis only. Past performance does not guarantee future results. Manage risk against your own portfolio.
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