Forex Lot Size Calculator
Calculate the correct lot size for forex trades based on account balance, risk percentage, and stop loss in pips.
Supports standard, mini, and micro lots.
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Forex Lot Size
Forex lot sizing determines how many units of currency to trade based on your risk tolerance.
Core formula:
Lot Size = (Account Balance × Risk %) / (Stop Loss Pips × Pip Value)
Forex lot types:
- Standard lot = 100,000 units (pip value ≈ $10 for USD pairs)
- Mini lot = 10,000 units (pip value ≈ $1)
- Micro lot = 1,000 units (pip value ≈ $0.10)
Pip value for USD-quoted pairs (e.g., EUR/USD):
Pip Value = Lot Size × 0.0001
- Standard lot: 100,000 × 0.0001 = $10 per pip
- Mini lot: 10,000 × 0.0001 = $1 per pip
- Micro lot: 1,000 × 0.0001 = $0.10 per pip
Example: $10,000 account, 1% risk, 50-pip stop loss:
- Risk amount: $10,000 × 1% = $100
- Lot size: $100 / (50 × $10) = 0.20 standard lots
- That equals 2 mini lots or 20 micro lots
Important: Pip values vary for non-USD pairs. This calculator uses the standard USD pip value. For cross pairs, check your broker for exact pip values.