Forex Lot Size Calculator
Calculate the exact lot size for your forex trades — standard, mini, or micro lots — based on your account risk parameters.
Calculator
Risk Amount ($)
$100.00
Standard Lots
0.00
Mini Lots
0.00
Micro Lots
0.00
How It Works
Lot sizing determines how many units of currency you trade. Forex lots come in three standard sizes: standard (100,000 units), mini (10,000 units), and micro (1,000 units).
This calculator converts your position size into lots. It uses your account balance, risk percentage, stop loss distance, and pip value to calculate the safest lot size for each trade.
Using proper lot sizing is essential for risk management — it ensures you don't risk too much of your account on any single trade.
The Formula
Position Size (units) = (Account Balance × Risk %) / (Stop Loss × Pip Value), then convert to lots: Standard = Units / 100000, Mini = Units / 10000, Micro = Units / 1000Standard Lot = 100,000 units (1.0 lot), Mini Lot = 10,000 units (0.1 lot), Micro Lot = 1,000 units (0.01 lot)
Example
Scenario: You have a $5,000 account, risk 2% per trade, with a 50-pip stop loss and $10 pip value.
Calculation: Risk Amount = $5,000 × 2% = $100. Position Size = $100 / (50 × $10) = 0.2 lots.
Result: Trade 0.20 standard lots (20,000 units), or 2.00 mini lots, or 20.00 micro lots.