Currency Exchange Calculator

Convert currencies using exchange rate, spread, fixed fee, and service fee assumptions.

Exchange inputs

Estimate received currency after exchange spread, fixed fee, and card or service fee.

Source amountMarket rateExchange spread

Fixed feeService fee

Received amount

1,322.13

Customer rate

1.3338

Effective rate

1.322131

Total cost

27.87

2.06% of market value

Gross exchanged amount

1,333.8

Variable fee

6.67

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What is the currency exchange calculator?

This calculator converts between currencies using the daily exchange-rate structure used in Korea. It is designed for travel cash, overseas shopping, remittance, foreign-currency deposits, and import or export estimates where the exchange-rate type matters.

The Korean source uses Bank of Korea API exchange-rate data updated daily. It separates the trading base rate, cash buying and selling rates, telegraphic-transfer rates, and bank spreads so the result is closer to what a user actually pays.

Exchange-rate types

Trading base rate

The trading base rate is the reference rate announced by foreign-exchange banks.
The Korean guide describes it as based on the previous close from Seoul Money Brokerage and announced by the Bank of Korea around 09:00.
Example: if the USD/KRW trading base rate is KRW 1,300, one US dollar is referenced at KRW 1,300 before spreads and transaction fees.

Cash and telegraphic-transfer rates

Cash buy rate means the customer buys foreign cash: base rate plus the bank fee.
Cash sell rate means the customer sells foreign cash: base rate minus the bank fee.
With a KRW 1,300 base and about 2% cash spread, cash buy is KRW 1,326 and cash sell is KRW 1,274, creating a KRW 52 gap.
Telegraphic-transfer rates apply to account transfers, remittances, foreign-currency deposits, and card settlements and are usually cheaper than physical cash.

Practical scenarios

Travel and overseas shopping

KRW 2,000,000 exchanged to USD at a KRW 1,300 base gives about USD 1,538 before cash spread.
At a KRW 1,326 cash buy rate, the traveler receives about USD 1,508, so the fee difference is about USD 30 or KRW 40,000.
For Japanese overseas shopping, JPY quotes may be shown per JPY 100. A JPY 30,000 item at KRW 900 per JPY 100 is about KRW 270,000.

Remittance and cost control

A USD 1,000 remittance at KRW 1,310 telegraphic-transfer buy plus a KRW 15,000 remittance fee requires KRW 1,325,000.
Compare bank mobile rates, fintech remittance providers, credit-card settlement rates, and cash exchange booths separately.
Use exchange-rate alerts, split large exchanges into several dates, and avoid airport cash exchange unless convenience is worth the spread.