Risk Per Trade
Definition
Risk per trade is the percentage of account equity exposed to loss on any single trade (typically 0.5-2% for retail traders). It is the most important sizing parameter — too low compresses returns to insignificance, too high produces unsustainable drawdown bands.
Formula
R = \frac{|S_{entry} - S_{stop}| \times Lots \times pipValue}{Equity}R = (|entry − stop| × position size × pip value) / account equity
In-depth: Risk Per Trade
Risk per trade (also called position-sizing risk, R-value, or fractional risk) is the master sizing parameter for any forex strategy. Almost every other risk metric — max drawdown, Calmar ratio, expectancy, recovery time — depends on it.
Formal definition: R = (|entry_price − stop_loss_price| × position_size_in_units × pip_value_in_account_currency) ÷ account_equity, expressed as a percentage. For a trader with $10,000 account, $10/pip lot size, 20-pip stop, the risk per trade is $200, which is 2% of equity. Position size must be calculated dynamically based on equity, stop distance, and pip value — fixed-lot sizing produces variable R across instruments and over time.
Editorial tier defaults across the 2026 EA market: • Safety tier: 0.5-1.0% (Smart Robot AI default, Trendopedia conservative mode, Fortuna EA) • Most-profitable tier: 1-1.5% (Scalperology default, GoldStrike standard) • Aggressive tier: 1.5-2.5% (most grid and martingale systems, which we exclude from safety-tier consideration entirely) • Self-destructive tier: 3-5%+ (used by some vendors marketing high returns; produces unsustainable drawdown distributions)
The relationship between risk-per-trade and drawdown: • At constant win-rate, drawdown scales approximately linearly with risk-per-trade • At 1% risk per trade, typical scalping EA drawdown bands are 12-18% • At 2% risk per trade, the same EA produces 24-36% drawdown bands • At 3% risk per trade, drawdown exceeds 50% during stress periods, eroding the account's ability to recover
Common trader error: increasing risk-per-trade above vendor defaults to chase higher returns. The mathematics is unforgiving — returns scale with risk-per-trade up to a point, but the drawdown scaling rapidly produces accounts that cannot recover from the deeper underwater periods. A strategy with 6% monthly returns at 1% risk-per-trade and 18% max drawdown does NOT become 12% monthly returns at 2% risk-per-trade with 36% drawdown; the deeper drawdown reduces position size as equity drops, compressing the recovery rate. The realised outcome is usually 8-9% monthly with 36% drawdown — substantially worse risk-adjusted return than the 1% configuration.
For live deployment, the editorial guidance is uniform: run vendor defaults for 6+ months before considering any risk-per-trade adjustment. The defaults reflect the realistic edge under stable conditions; deviating without first establishing baseline performance produces noisy data that doesn't justify the adjustment.