Position Size Calculator
Calculate how many units or lots to trade based on your risk parameters.
Units
20,000
Lot Size
0.2
Dollar Risk
$100
Margin (est.)
$220
Size your positions correctly with a funded account
Frequently Asked Questions
What is position sizing in trading?+
Position sizing determines how many units or lots you trade based on your risk tolerance. It ensures you never risk more than a set percentage of your account on any single trade, which is critical for passing prop firm challenges.
How is position size different from lot size?+
Position size is measured in units (e.g., 20,000 units of EUR/USD), while lot size is a standardized measurement (0.2 lots = 20,000 units for forex). Our calculator shows both so you can use whichever your platform requires.
What margin is needed for prop firm trading?+
Most prop firms provide 1:100 leverage for forex. Our calculator estimates margin at 1:100. For indices and gold, leverage varies by firm. Always check your firm’s specific margin requirements.