USD/KRW Converter (US Dollar to Korean Won)

How it works

What this calculator does

It converts an amount between US dollars and Korean won using one rate: USD/KRW, quoted as won per 1 dollar. On load it fetches the most recent European Central Bank reference rate from the open, keyless Frankfurter API and fills it in for you. If that lookup fails, the page says so and you simply type the current rate yourself — every calculation still runs entirely in your browser.

How USD/KRW is quoted

The won is a “big figure” currency: one dollar buys on the order of a thousand won, so USD/KRW prints as a four-digit number like 1,512.45. There is no commonly used sub-unit (the jeon exists on paper but not in practice), which is why won amounts are shown as whole numbers here. Koreans also count large amounts in units of 10,000 won (man-won) — the result card shows what 1 man-won is worth in dollars for that reason.

The formulas

KRW = USD × rate  and  USD = KRW ÷ rate, where rate is won per 1 dollar.

With a markup of m%, the amount you actually receive is converted × (1 − m/100). The markup line exists because the reference rate is a mid rate no retail customer transacts at.

Worked example — dollars to won

Sending $2,500 at a reference rate of 1,512.45 gives 2,500 × 1,512.45 = ₩3,781,125. If your bank prices the transfer 1.5% worse, you receive about 3,781,125 × 0.985 = ₩3,724,408 — the spread quietly costs ₩56,717, or roughly $37.50.

Worked example — won to dollars

Converting ₩5,000,000 at 1,512.45 gives 5,000,000 ÷ 1,512.45 = $3,305.90. The same 1.5% markup would leave about $3,256.31.

What the reference rate is — and is not

The ECB publishes one reference rate per currency each business day, around 16:00 Central European Time, based on a market snapshot. It is designed for statistics and comparison, not for dealing: on weekends and holidays you get the last business day’s print, and during volatile sessions the live interbank price can sit well away from it. Treat it as an anchor to sanity-check the rate your bank, card or broker offers.

Why traders care about USD/KRW

The won is a managed, partially convertible currency. Offshore, most institutional trading happens in non-deliverable forwards (NDFs) rather than spot, and few retail brokers list USD/KRW at all. In practice the pair matters to traders as a risk gauge — it tracks Korean equity flows and Asia risk appetite — and to anyone moving real money between the two countries, including anyone funding a Korean brokerage account or converting Korean stock proceeds back to dollars.

Common mistakes

• Flipping the direction. The rate here is won per dollar. Multiply going into won, divide coming out. Mixing that up produces answers that are wrong by six orders of magnitude, which at least makes the error easy to spot.
• Treating the reference rate as bookable. No bank fills at the ECB mid. Compare the rate you are actually offered against it and the difference is your all-in cost.
• Ignoring fixed fees. A wire fee of $15–$45 comes on top of the spread and dominates the cost of small transfers.
• Reading stale prints as live. A weekend “today’s rate” is Friday’s. The page shows the date of the loaded rate so you can tell.