What is dynamic currency conversion (DCC)?

When you pay by card abroad, the terminal may offer to bill you in your home currency instead of the local one. That conversion is performed by the merchant’s acquirer at a rate it chooses, rather than by your card network.

Is declining DCC always cheaper?

No. Paying in the local currency shifts conversion to your card network but your issuer may then add a foreign transaction fee. Whether declining is cheaper depends on the DCC markup offered versus your own card’s fee, which is why this page asks you for both.

How can I avoid both costs?

A multi-currency account or card converts close to the mid-market rate and does not add an issuer foreign transaction fee, so it usually lands below both options. The remaining cost is that provider’s own conversion fee.

What DCC actually costs you in Korea

When a Korean card terminal offers to charge you in your own currency instead of won, that is dynamic currency conversion, and the exchange rate is set by the merchant's acquirer rather than your card network. Declining it is not automatically cheaper: it depends on the markup you are offered versus your own card's foreign transaction fee. The calculator below compares all three routes using your figures.

Work out your own numbers

Purchase amount (KRW)Your currencyWhole-trip card spend (KRW)Used to scale the gap up to your whole trip.

Common amounts

Adjust the fee assumptions— defaults: card 1.5%, DCC 5%, multi-currency 0.6%

These three are your inputs, not our measurements. The defaults are commonly-reported ranges. Your card's terms and the terminal's own screen are the authoritative sources.

Your card's foreign transaction fee (%)Check your card terms — typically 0–3%.DCC markup offered (%)Shown on the terminal, or commonly reported at 3–7%.Multi-currency card fee (%)Varies by provider, currency pair and amount.

My issuer still charges its foreign transaction fee even when I pay in my own currency (uncommon, but some issuers do)

Cheapest route on this purchase

Multi-currency card — $69.84

The worst option (Accept DCC (pay in your currency)) costs $3.05 more on this one payment. Across ₩1,500,000 of card spend that gap becomes $45.82.

Mid-market reference: $69.42 — this is the baseline, not a price you can actually get.
Option	You pay	vs mid-market
Multi-currency cardcheapest Card converts at close to the mid-market rate; no issuer FX fee.	$69.84	$0.42 (0.60%)
Pay in KRW (decline DCC) Card network converts, then your issuer adds its foreign transaction fee.	$70.46	$1.04 (1.50%)
Accept DCC (pay in your currency) The merchant's acquirer converts, at a rate it sets.	$72.89	$3.47 (5.00%)

Converted using the exchange rate we observed on 2026-08-03. Only that rate is measured data — the three fee percentages are your inputs, and the defaults are commonly-reported ranges rather than figures we verified. Card networks also apply their own small spread that we cannot observe, so treat the result as an estimate of the gap between options, not an exact statement of your bill.

What to do at the terminal

Ask which currency the terminal is set to. DCC is often pre-selected, and in some cases it is applied without being offered.
Read the markup if it is shown. Disclosure rules require the rate or margin to be presented, though how prominently varies.
Compare against your own card's fee rather than assuming either option wins. That is what the calculator above is for.

Removing the choice entirely

A multi-currency account converts close to the mid-market rate and does not add an issuer foreign transaction fee, which in most combinations lands below both paying in won and accepting DCC. It does not make conversion free — the provider takes its own fee, which is the third input in the calculator.

We are not linking a provider here yet. We will add one when we have a partnership in place and will label it as such.

What we measure, and what we don't

We collect exchange rates once a day and publish the history, so the rate used above is a real observation with a date attached. We do not measure your issuer's fee, the acquirer's markup, or a specific provider's conversion fee — those are set per card and per merchant, so we ask you for them instead of inventing figures.