A lot is the standardized unit of trade size in forex. Understanding lot sizes is crucial for position sizing and risk management.

Lot Sizes

Lot Type Units Pip Value (USD pairs)
Standard 100,000 $10 per pip
Mini 10,000 $1 per pip
Micro 1,000 $0.10 per pip
Nano 100 $0.01 per pip

Calculating Position Value

1 standard lot of EUR/USD:

  • 100,000 EUR
  • At 1.0850 = $108,500 notional value
  • Margin at 1:100 = $1,085

Position Sizing Formula

Lot Size = (Account Balance × Risk%) / (Stop Loss in Pips × Pip Value)

Example:

  • Account: $10,000
  • Risk: 2% = $200
  • Stop loss: 50 pips
  • Pip value: $10
  • Lot size = $200 / (50 × $10) = 0.4 lots

Key Points

  • Always size positions based on risk, not gut feeling
  • Smaller lots = more flexibility
  • Most brokers offer micro lots for beginners
  • Use a lot size calculator for precision