Tools🇰🇷 KO

Stock Return Calculator

Realized P/L with fees & taxes, break-even and target price

※ For information only — not investment advice. Brokerage fees vary by account; capital gains tax is not included.
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📈 Stock Average％ Percentage📈 Compound Interest
FAQ
How is the return calculated?
Realized P/L = sale proceeds − sell fee − transaction tax − (purchase cost + buy fee). Return = realized P/L ÷ total purchase cost × 100. Unlike the raw price change, this reflects what you actually keep after fees and taxes.
What tax rate should I enter?
It depends on your market. Korean listed stocks charge 0.15% on the sell side; US stocks have only a tiny SEC fee, so 0 is a reasonable input. Capital gains tax is separate and not included here.
Why is the break-even price higher than my buy price?
Because fees apply on both the buy and the sell, and tax applies on the sell. The calculator shows the exact price you need to sell at just to get your money back.
How does the target-price tab work?
Enter your average price and a desired return, and it reverse-calculates the sell price that actually delivers that return after fees and taxes, plus a quick table for common return levels.
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Your real return is not the price change

Buy at 50 and sell at 55 and the price moved +10% — but your realized return is lower once brokerage fees on both sides and any sell-side transaction tax come out. This calculator applies buy fee, sell fee and tax to show your realized profit or loss, the true return percentage, and the break-even sell price where you just get your money back.

Target price, reversed

The target-price tab answers the opposite question: at what price do I need to sell to net, say, 10% after costs? Required price = buy price × (1+fee) × (1+target) ÷ (1−fee−tax), with a quick reference table from −10% to +30%. To work out your average cost across multiple buys first, use the stock average calculator.

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