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📈 Stock Profit Calculator

Realized profit/loss for one buy–sell round trip, commissions included.

🔒 100% client-side processing

Result

Total cost

Total proceeds

Net P/L

ROI

Break-even sell price

Enter prices manually — this tool does not fetch live quotes. Long positions only; shorting and dividends are not included.

How to Use

1
### Enter the Trade Type the buy price, sell price (actual or planned), and the number of shares.
2
### Add Your Commissions Enter the buy and sell commission, each as a flat amount or a percentage — whichever your broker charges.
3
### Read the Breakdown Total cost, total proceeds, net P/L, ROI %, and the break-even sell price update instantly.
4
### Add a Currency Symbol Optionally type a symbol like $, €, or ¥ to display next to every amount.

Features

  • ✓
    Full Fee Support Model each commission as a flat amount or a percentage of the trade — mixed modes allowed.
  • ✓
    Break-Even Price Know exactly which sell price covers your costs, including the sell-side fee.
  • ✓
    True ROI Return on investment measured against total cost including fees — not just the raw share price gain.
  • ✓
    Currency-Agnostic Plain numbers work with any currency; an optional symbol prefix is display-only.
  • ✓
    Private by Design No live quotes, no external API — every calculation runs in your browser and nothing leaves your device.

    • Use Cases

    ### Review a Closed Trade Enter the actual buy and sell prices to see the true net result after commissions.
    ### Plan an Exit Use the break-even sell price to set a limit order that guarantees you cover your costs.
    ### Compare Fee Structures Switch commissions between flat and percentage to see how your broker's pricing eats into returns.
    ### Size a Position Try different share counts to understand how fixed fees weigh more heavily on small trades.

    Frequently Asked Questions

    How is the net profit or loss calculated?

    Total cost is your shares times the buy price plus the buy commission. Total proceeds are your shares times the sell price minus the sell commission. Net P/L is proceeds minus cost, and ROI is that P/L expressed as a percentage of the total cost.

    What is the break-even sell price?

    It is the price per share at which your net profit would be exactly zero, given the buy commission already paid and the sell commission mode you selected. With a percentage sell fee the break-even price is slightly higher than with a flat fee of the same nominal size, because the fee grows with the price.

    Should I enter the commission as a flat amount or a percentage?

    Match your broker. Many US brokers charge a flat fee per trade (enter it as Flat), while percentage-based commissions are common in other markets (enter the rate as %). You can mix the two — for example a flat buy fee and a percentage sell fee.

    Does the calculator fetch live stock quotes?

    No. All prices are entered manually, so the tool works fully offline and never sends your trades anywhere. Check your broker or a market site for the current quote, then type it in.

    Does it support short selling or dividends?

    No. It models one long buy–sell round trip only. Short positions involve borrow fees and interest, and dividends involve tax treatment that varies by jurisdiction — both are intentionally out of scope.

    Which currency does the calculator use?

    It is currency-agnostic: the math is identical for dollars, euros, yen, or anything else. Type an optional symbol (like $ or €) if you want it displayed next to the amounts.