Stock Profit Calculator — Shares Gain & Loss

Net Profit = (Sell Price − Buy Price) × Number of Shares − Total Commissions. For example: bought 100 shares at $50, sold at $65, with $9.99 commission each way → Gross profit = (65−50) × 100 = $1,500. Net profit = $1,500 − $19.98 = $1,480.02.

ROI (Return on Investment) = Net Profit ÷ Total Amount Invested × 100. If you invested $5,000 and made a net profit of $1,480, your ROI = 1,480 ÷ 5,000 × 100 = 29.6%. ROI lets you compare performance across trades of different sizes.

Commissions reduce your net profit directly. On a small trade, commissions can eat a significant percentage of your gains. For example, $19.98 in commissions on a $500 trade = almost 4% cost before the stock even moves. This is why many traders now use zero-commission brokers like Robinhood, Webull, or Fidelity.

Profit % = (Net Profit ÷ Total Cost) × 100. Total cost = Buy Price × Shares + Buy Commission. This is more accurate than just comparing prices because it accounts for what you actually spent including fees.

Commissions directly reduce your net profit. On a $5,000 position with $10 commission each way, your $20 total cost means you need the stock to rise 0.4% ($20 ÷ $5,000) just to break even. On smaller positions the impact is larger — a $500 trade with $10 commission needs a 4% gain to break even. This is why commission-free brokers (Robinhood, Webull, etc.) are significant for active small-account traders.