Enter buy price, sell price, shares, and commissions to calculate profit or loss and return percentage.
How to Use the Stock Profit Calculator
Enter the buy price, sell price, and share count, then add any commissions paid on either side — profit or loss and the return percentage come out the other end.
Total Cost = (Buy Price × Shares) + Buy Commission
Total Proceeds = (Sell Price × Shares) − Sell Commission
Profit = Total Proceeds − Total Cost
Return % = Profit ÷ Total Cost × 100Commissions matter more than their small size suggests, especially on trades that would otherwise be near break-even. A trade with $0 commission built in looks profitable at a 2% price move; add a few dollars of trading fees on each leg and that same move can turn into a loss once both are subtracted out.
Return percentage here is calculated against total cost, not against the raw purchase price — commission-inclusive, in other words — since that's the actual amount of capital that was put at risk to make the trade happen.
This is a realized-trade calculator: it assumes shares were bought and then sold, not a running mark-to-market on a position still being held.