Forex Position Size Calculator
Risk management starts with correct position sizing. Enter your account size, how much you're willing to risk, and your stop loss — and get the exact lot size to trade.
Position Size Calculator
Calculate optimal lot size based on account risk
Why Position Sizing Matters
Position sizing is one of the most critical — and most overlooked — aspects of forex trading. Trading too large a position relative to your account is the single most common cause of blown trading accounts.
The formula
Lot Size = Risk Amount / (Stop Loss in Pips × Pip Value per Lot)
For example: a $10,000 account risking 1% ($100) with a 20 pip stop on EUR/USD (pip value = $10/lot):
Lot Size = $100 / (20 × $10) = 0.5 lots
Risk per trade guidelines
- Conservative: 0.5% – 1% per trade
- Moderate: 1% – 2% per trade
- Aggressive: 2% – 5% per trade (higher drawdown risk)
Most professional traders risk no more than 1–2% of their account per trade. This ensures that even a losing streak of 10 consecutive trades only drawdowns the account by 10–20%, leaving the account viable to recover.