Stock Profit/Loss Calculator

Use this Stock Profit/Loss Calculator to estimate the result of buying and selling shares after transaction costs. Enter one or more purchase lots, a selling price, buy and sell commissions, other market charges, and an optional estimated tax rate. The calculator shows total investment, gross proceeds, gross gain or loss, estimated tax, net profit or loss, and percentage return.

How the Stock Profit/Loss Calculator Works

The calculator builds a cost basis from every entered purchase lot. Cost basis includes share cost, buy-side commission, and other buy charges. It then subtracts sell-side commission, other sell charges, and user-entered estimated tax from sale proceeds. Net profit or loss equals net proceeds after those deductions minus total cost basis.

Buy Price, Sell Price, and Share Quantity

For a single purchase, enter buy price per share and quantity in the first lot. Add more lots when the same stock was purchased at different prices. Total shares are added together, while average buy price is weighted by quantity rather than taking a simple average of listed prices.

Multiple Stock Lots and Average Buy Price

Weighted average buy price equals total share purchase value divided by total shares. Transaction fees are included separately in cost basis, so the tool also displays an effective cost per share after buy charges. This distinction helps when a broker statement separates execution price from fees.

Brokerage Fees and Other Trading Charges

Buy commission, sell commission, STT, stamp duty, regulatory fees, exchange fees, and similar market-specific costs can reduce returns. The calculator accepts separate fixed amounts for buy commission, sell commission, and other charges on each side. The SEC's Investor.gov guidance notes that transaction fees and commissions reduce investment returns, even when an individual fee appears small.

Estimated Capital Gains Tax

Tax rules vary by country, account type, holding period, security, residency, loss treatment, and tax year. This calculator does not select a legal tax rate. Enter an estimated percentage only if appropriate; it is applied to a positive gain after entered trading charges and never creates a tax benefit for a loss. Confirm actual tax treatment with current official guidance or a qualified tax professional.

Short-Term and Long-Term Holding Period

Purchase and sale dates produce an approximate holding-period label. The tool marks more than 365 days as long-term context, but that label does not determine legal tax treatment in every jurisdiction. Multiple purchase lots can also have different acquisition dates, which may require lot-by-lot tax accounting.

Break-Even Stock Price

Break-even price estimates the per-share sale price needed to recover cost basis plus entered fixed sell charges before tax. Actual execution may differ because market prices move, orders may fill at different prices, and some brokers calculate percentage or tiered charges instead of fixed amounts.

Stop-Loss, Target Price, and Risk Reward

Enter optional stop-loss and target prices to compare downside from weighted average buy price with potential upside. Risk-reward is target reward divided by stop risk. It is a planning measurement, not a forecast, recommendation, or guarantee that either order will execute at the entered price.

Portfolio Profit and Loss Comparison

Add other stock positions using invested amount and current value to compare them side by side. The calculator combines those positions with the current stock result and displays total invested value, current or net value, and aggregate profit or loss. This lightweight comparison does not replace brokerage records or full portfolio accounting.

Return Compared with a Market Benchmark

Enter an optional benchmark return for the same measurement period. The tool subtracts benchmark return from the calculated stock return to show percentage-point outperformance or underperformance. Meaningful comparison requires matching dates, currency, dividends, fees, and risk.

Local History, Export, and Privacy

Saved calculations remain in local browser storage on the current device and are not synchronized. Copy a text summary, download a spreadsheet-compatible CSV, share through the browser when supported, or print and save the page as PDF. Clearing browser data removes local history.

Using the Result Responsibly

This calculator is an educational arithmetic tool and does not provide investment, legal, accounting, or tax advice. It does not include dividends, currency changes, corporate actions, bid-ask spreads, slippage, percentage-based fees, inflation, or every jurisdiction-specific charge unless you enter them. Verify important results against broker contract notes and official records before making financial or tax decisions.