Position Size Calculator

This calculator returns an educational suggested position size given your account balance, risk-per-trade percentage, entry price, and stop-loss price. It tells you how many shares, contracts, or units keep your worst-case loss inside the dollar amount you decided to risk.

1. Enter your account balance — the capital you actually trade with.
2. Pick a risk-per-trade percentage. Beginners typically use 0.5%–1%.
3. Enter the planned entry price and the stop-loss price.
4. The calculator returns the amount at risk, risk per unit, and a suggested position size.

Amount at Risk = Account × Risk %
Risk per Unit = |Entry − Stop|
Position Size = Amount at Risk ÷ Risk per Unit

Account $10,000, risk 1%, entry $50, stop $48. Amount at risk = $100. Risk per unit = $2. Suggested size = 50 units. Position value = $2,500.

• Sizing first and setting the stop second — the stop must come from chart structure, not from how many units you want to own.
• Using a wide stop just to fit a larger position. That breaks the risk budget.
• Forgetting fees and slippage — at small sizes they can quietly eat your edge.