The card machine is handed to you at the end of a long lunch in Bali, and the screen asks a friendly question: "Pay in AUD or IDR?" Paying in dollars sounds simpler, because you know what a dollar is. It is also one of the most reliable ways to pay more than you need to on holiday. Here is how to avoid that trap, keep your card and ATM fees down, and convert prices in your head without a calculator.
The Dynamic Currency Conversion trap
That "pay in your home currency?" offer is called Dynamic Currency Conversion (DCC). When you accept it, the conversion is done by the merchant's payment provider instead of your own bank, at an exchange rate they set. That rate commonly includes a margin of several percent above the market rate (sometimes considerably more), and it is not always clearly shown.
The rule is simple:
Always choose to pay in the local currency. On a card terminal, choose IDR, JPY, EUR or whatever the local currency is. At an ATM, choose to withdraw without conversion. The button may say "Decline conversion", "Continue without conversion" or similar.
A few things to watch for:
- Staff may choose for you. Some terminals let the person holding the machine pick the currency before handing it over. Say "local currency, please" before they start, and check the screen before you tap.
- The wording is designed to nudge you. Phrases like "guaranteed rate", "no hidden fees" or "see the exact amount in AUD" usually accompany the more expensive option.
- Check your receipt. If it shows an exchange rate and an amount in Australian dollars, you were charged via DCC. If it happens and you did not agree to it, it is worth raising with the merchant and your bank.
Cards: choose one without foreign transaction fees
Many standard Australian bank cards charge an international transaction fee on every overseas purchase, often around 3% of the amount, and sometimes on purchases from overseas websites too. Over a two-week trip, that quietly adds up.
Several Australian banks, credit unions and fintech providers offer debit, credit or prepaid travel cards that waive foreign transaction fees and convert at or close to the network rate. They vary in their ATM fees, top-up rules and how they handle currencies you have not preloaded, so compare the current terms before you choose. Practical tips:
- Take two cards, ideally on different networks (for example a Visa and a Mastercard), and keep them in separate places.
- Let your bank know you are travelling if they still ask for it, and make sure your banking app works overseas for card locks and alerts.
- Watch for local card surcharges. In some countries small businesses add a percentage for card payments, just as some Australian cafés do. Cash may genuinely be cheaper there.
ATM fees
An overseas cash withdrawal can attract up to three separate costs:
- The local ATM operator's fee. Many countries' ATMs charge foreign cards a flat fee per withdrawal; in Thailand, for example, it is typically a couple of hundred baht. It is usually shown on screen before you confirm.
- Your own bank's fee for an overseas withdrawal, plus any foreign transaction percentage.
- DCC, if you accept the ATM's offer to convert for you. Decline it.
Because the operator fee is usually flat, fewer and larger withdrawals cost less than lots of small ones. Use ATMs attached to bank branches where you can, as they tend to be safer, better maintained and less aggressive about DCC than standalone machines on busy tourist strips. And cover the keypad when you enter your PIN.
Mental maths for big-number currencies
In Indonesia, Vietnam, Japan and Korea, prices run into the thousands or hundreds of thousands, and it is easy to lose track of what something actually costs. The trick is a rough rule you can apply in a second, then a correction if the decision matters. The rates below are approximate, for Australian dollars, and rates move, so recalibrate with a live rate when you arrive.
| Currency | Rough rule (approximate) | Example |
|---|---|---|
| Indonesian rupiah (IDR) | Roughly Rp 10,000–11,000 to A$1: drop four zeros, then shave off a little | Rp 85,000 → about A$8 |
| Vietnamese đồng (VND) | Roughly 16,000–17,000 đồng to A$1: think of 100,000 đồng as about A$6 | 250,000 đồng → about A$15 |
| Japanese yen (JPY) | Roughly ¥95–100 to A$1: drop two zeros | ¥1,200 ramen → about A$12 |
| Korean won (KRW) | Roughly ₩900 to A$1: drop three zeros and add about 10% | ₩15,000 → about A$16.50 |
These shortcuts are deliberately rough and the rates are approximate at the time of writing. They are for deciding whether a dish is worth it, not for budgeting to the cent. Check a live rate before you travel and adjust your rule if it has moved.
Watch out for shorthand on menus
Menus in big-number countries often drop the zeros for you. In Bali, a price of "25" usually means Rp 25,000; in Vietnam you will often see "25K" or just "25" for 25,000 đồng. The Indonesian abbreviation "rb" (short for ribu, thousand) means the same thing: "25rb" is Rp 25,000.
The notes can be confusing too. In Vietnam, the 20,000 and 500,000 đồng notes are both bluish polymer notes, and travellers mix them up surprisingly often. Count your change, and keep large notes separate from small ones.
Why swap.menu shows two prices
When you photograph a menu, swap.menu shows each dish with the price as printed and converted to your home currency. Both numbers are there on purpose:
- The printed price is what appears on the bill, so it is the one to check against your receipt and the one the waiter will recognise.
- The home-currency price is what you actually think in. It is the number that tells you whether a Rp 185,000 seafood platter is a treat or a bargain.
Where the menu mentions service charges or tax, those are added into your order total too, so the converted figure reflects what you are likely to pay rather than the bare menu prices. See our guide to tax and service charges on menus for how that works.
A word of honesty about conversions: any converted price is approximate. It is based on a reference exchange rate, and the amount that eventually leaves your account depends on the rate your card provider uses on the day the transaction settles, plus any fees they charge. Treat the home-currency figure as a very good guide, not a quote.
Know what every dish costs in dollars before you order. Try the demo to see printed and converted prices side by side.
Try the free demoA quick checklist
- Always pay and withdraw in the local currency, and decline any conversion offer.
- Travel with at least one card that has no foreign transaction fees, plus a backup.
- Make fewer, larger ATM withdrawals, preferably from bank-branch machines.
- Learn one rough mental-maths rule per currency, and update it when rates move.
- Read menu shorthand: "25", "25K" and "25rb" usually mean 25,000.
- Carry some small notes for warungs, street stalls and markets where cards are not taken. See our guide to ordering at a Bali warung.