Choose whether gains show in red, as at Korean brokers, or in green, as overseas. Your choice is saved on this device.
Returns & Compounding Calculators
Splits your won return on US stocks into stock price gains and currency gains or losses.
A 1% spread with a 95% discount gives 0.05%
Enter your values and press Calculate
Total profit or loss in won
-
How to use
Your return in won mixes stock price gains with exchange rate moves. Separating the two lets you tell real investment performance from currency luck.
Enter the purchase price, current price and quantity in dollars.
Enter the exchange rate at the time of purchase and the current rate. The current rate is filled in automatically from the latest data.
It includes commissions and currency exchange costs to calculate the won profit you actually take home.
Subtract trading commissions and exchange costs from the sum of the two effects to get your net profit or loss in won. For capital gains tax (22% after a KRW 2.5 million deduction), use the Overseas Stock Capital Gains Tax Simulator. The capital gain is converted into won using the exchange rates on the settlement dates of the purchase and the sale.
Capital gains on overseas stocks are calculated by subtracting the acquisition cost in won from the sale amount converted into won, so gains caused by a rising exchange rate are also included in the capital gain.
Yes. If you reinvest in dollars after selling instead of converting back to won, you pay the exchange cost only once. However, the value in won keeps changing with the exchange rate.
The USD/KRW rate at the most recent market close in the site's market data is filled in automatically. It may differ from the actual rate your broker uses for exchange.
Results are estimates based on your inputs and simplified assumptions, and are for reference only, not a basis for investment decisions.
Last updated: November 2, 2026
Convert 12 currencies, including the dollar, yen and euro, into won, and see the real cost based on cash and wire transfer rates and exchange rate discounts.
Simulate how much you could sell before year-end to cut your tax, using the KRW 2.5 million basic deduction and netting of gains and losses.
Compare overseas stock fees and exchange discounts at 10 brokers and calculate your annual cost based on your own trading.