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US Stock Return Calculator in KRW

A gain in dollars—but also in won?

Compare performance in dollars and won using exchange rates at purchase and sale. For an unsold holding, use a current price and exchange rate to estimate unrealized profit/loss.

Calculation inputs

Exchange rates are KRW per USD. Enter them directly; no live prices are loaded.

Exchange rates at both points
Total trading fees (USD)

Enter the total dollar fee for each trade, not a percentage. Enter 0 to exclude fees.

Each input supports 12 integer digits and 8 decimal places. To reflect exchange costs, use the exchange rate actually applied.

Calculation result

Enter prices, quantity and both exchange rates to see results.

The shared URL contains your prices, quantity, exchange rates and fees.

Explore a different calculation

Calculate trade returns in one currency → Calculate annualized return →

A price gain can still mean a loss in KRW

Consider buying 10 shares at USD 100 and selling at USD 110. Fees are zero; buy FX is KRW 1,400 per USD and sale FX is KRW 1,250.

In USD, 1,000 becomes 1,100: a 10% gain. In KRW, 1,400,000 becomes 1,375,000: a loss of 25,000, or about −1.7857%.

USD profit of 100 at buy FX contributes +KRW 140,000. Applying the −150 FX change to net proceeds of USD 1,100 contributes −KRW 165,000. The sum is −KRW 25,000.

KRW return formula

USD purchase cost = buy price × quantity + buy fee. Net USD sale proceeds = sale price × quantity − sale fee.

KRW purchase cost = USD purchase cost × buy FX

Net KRW proceeds = net USD proceeds × sale FX

For each currency, profit/loss is net proceeds minus purchase cost, and return is profit/loss divided by purchase cost × 100%. Both FX inputs are KRW/USD; converting only USD profit at sale FX gives a different result.

Scope and limitations

What if I have not converted the money?
This measures performance at the entered exchange rates, not realized FX gains. If you traded using existing USD holdings or used multiple conversion/deposit dates, actual cash flows need separate analysis.
What units should fees use?
Each fee is the total USD amount for that trade, not a per-share fee or percentage. Do not enter a KRW-denominated fee directly in a USD fee field.
What about multiple purchases or partial sales?
This calculation applies the same quantity to one purchase and one sale. A simple average of exchange rates from several transactions may not give an accurate result.
Is this an after-tax return?
No. Only entered trading fees are included. Capital gains tax, dividends, dividend tax and separately paid conversion fees are not calculated automatically.

2026-10-29 · Added US stock returns in KRW with entered exchange rates, USD fees and URL sharing.