Most retail traders blow up not because their idea was wrong but because they sized it wrong. Risk management is the architecture that lets a flawed idea survive long enough for the good ideas to compound.
Rule 1: define risk before opportunity
Decide your risk per trade as a percentage of equity (commonly 0.5%–1%) before you open the chart. Calculate the dollar value of that risk. Do not start hunting for setups until you know the size you are allowed to risk.
Rule 2: stop-loss is a constraint, not a suggestion
Place a stop-loss before entry, at a level where the original idea is invalidated. Move it only in your favour or on time-based exits. Never widen a stop because price went against you. That is rule-breaking.
Rule 3: position size to fit the stop, not the other way around
Given your risk dollars and your stop distance in pips, calculate position size. Use the position size calculator; do not eyeball it. Eyeballing is how 0.5% trades become 5% losses.
Rule 4: hard daily loss cap
Set a maximum daily loss (e.g. 3R = three risk-units). When you hit it, you are done for the day. Walking away after a bad streak is the highest-impact discipline rule for retail traders.
Rule 5: max number of concurrent positions
Correlated positions amplify exposure. Three long-EUR trades is one trade in three costumes. Cap concurrent positions, and treat correlated trades as a single risk.
Rule 6: track expectancy
Expectancy = (win % × avg win) − (loss % × avg loss). It is the average outcome per trade. If expectancy is positive across enough trades, scale carefully. If it's negative, your priority is plugging the leak — not adding leverage.
Worked example
Account: $5,000. Risk per trade: 1% = $50. Stop: 25 pips on EUR/USD. Pip value at 1 standard lot ≈ $10. Risk-dollar / (pips × pip-value) = 50 / (25 × 10) = 0.20 lots. Use 0.2 lots, not 1.0. The trader who uses 1.0 because "the spread is so tight" is not trading; they are gambling 5% of equity in one click.
Next steps on ShaFX
- Free trading calculators — position size, pip value, margin, risk/reward, drawdown.
- Take a quiz on this topic and see what you missed.
- Glossary — precise definitions for every term used here.
- Compare brokers using our methodology.