The single biggest difference between traders who survive and those who blow up is position sizing. Here is how to do it properly.
The formula
lot = (Saldo akun × Risiko%) ÷ (Stop-loss in pips × Pip value per lot).
A worked example
Akun: $5,000. Risiko: 1% = $50. Stop Loss: 25 pips on EUR/USD, where one standard-lot pip ≈ $10. Per lot stop cost = 25 × $10 = $250. lot = 50 ÷ 250 = 0.20 Lot.
Why fixed-percentage risk works
Kapan you always risk the same small percentage, no single trade can seriously damage your account, and your dollar risk stays steady whether your stop is tight or wide. This is the mechanical foundation of Long-term survival.
Do it automatically
ShaFX includes a position planner that runs this math and saves the planned trade to your journal, so your intended risk is recorded before you enter.