Exchange Spread Checker
“No commission” doesn’t mean free. The cost hides in the rate. Enter the rate you were offered and the mid-market rate to see what the spread is costing you.
Both rates are KRW per 1 unit of your home currency. Find the mid-market rate in any currency converter, then enter the rate you were actually offered.
| Value at mid-market | 690,000 KRW |
| You receive | 665,000 KRW |
| Your all-in rate | 1,330 KRW |
| Lost vs mid-market | 25,000 KRW · 3.6% |
An estimate from the rate and fees you enter, not a live rate, and nothing you type is stored. The gap between the rate you’re offered and the mid-market rate is your real cost.
How it works
Put in the rate you were quoted and any fee, and it shows what that costs you compared with the mid-market rate. The gap between the two rates is the “spread,” and that gap is the real cost of changing money.
The midpoint between a currency’s buy and sell prices, before any bank adds its margin. In Korean it’s the 매매기준율 (maemae gijunyul), and any currency converter shows it. How far your offered rate sits from that midpoint is what you pay.
No. You type in both the rate you were offered and the mid-market rate. Nothing is fetched live, and nothing you enter is stored. Treat the result as an estimate you can use to compare one offer with another.
Yes. Enter the rate the app or kiosk gives you and any fee it shows. It works the same for cash, a prepaid all-in-one card top-up, or a travel card from your home country.
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Questions visitors ask
Search “USD to KRW” (or your own currency) in any search engine or converter app. The rate it shows is the mid-market rate, with no margin added. Compare the rate you were offered against it.
Because the cost sits inside the rate (the spread), not in a separate fee line. A booth with “no commission” and a wide spread can cost more than one with a small fee and a tighter rate. So compare the actual rate.
It depends on that card’s exchange rate and fees. Check both on its app or kiosk, enter them here, and compare. No single option always wins, and this tool does not recommend one.