Currency Conversion Explained: What Travellers Need to Know

How Exchange Rates Actually Work

An exchange rate is the price of one currency expressed in another. When you see EUR/USD at 1.08, it means one euro costs $1.08 US dollars. These rates shift constantly based on global markets, economic data, and central bank policy — so the rate you see on Monday may differ from the one on Friday.

The rate you'll find quoted in financial news is called the mid-market rate (also called the interbank rate). It's the midpoint between what buyers and sellers pay in wholesale currency markets. Almost no retail provider — bank, airport kiosk, or card network — gives you this rate directly. They build in a margin, which is how they profit from the exchange. That margin is the core cost you're managing whenever you convert money abroad.

For a broader look at costs that catch travelers off guard, see our breakdown of hidden travel expenses.

Where You Exchange Matters More Than You Think

Not all exchange points are equal. Here's a plain comparison of the most common options:

• Airport kiosks and hotel desks: Convenient but consistently offer the weakest rates and highest fees. The markup over mid-market can reach 10–15%.
• Bank branches (domestic): Ordering foreign currency through your home bank before travel typically yields a better rate than exchanging on arrival, though some banks charge order fees.
• ATMs abroad: Withdrawing local currency directly from a foreign ATM often produces rates close to the interbank rate. The key variables are your home bank's foreign transaction fee (commonly 1–3%) and any fixed ATM fee charged by the overseas bank. Using ATMs attached to major local banks tends to be safer and more reliable than standalone machines.
• Local exchange bureaus: Quality varies widely. In some cities, licensed exchange offices in commercial areas post competitive rates; in tourist zones, assume the reverse.

A useful rule of thumb: the further from the airport you exchange, and the more locals use the venue, the closer you'll generally get to a fair rate.

Dynamic Currency Conversion: Always Decline It

Dynamic currency conversion (DCC) is an option that appears when you pay by card abroad. A terminal or cashier asks whether you'd like to pay in your home currency rather than the local one. It sounds convenient — you can see exactly what you're spending in dollars — but the conversion rate applied is set by the merchant's payment processor, not by your card network, and it almost always carries a significant markup, often 3–8% above mid-market.

The practical rule is simple: always choose to pay in the local currency. Your card network's rate, plus any foreign transaction fee your bank charges, will nearly always be more favorable. If a cashier has already selected your home currency on the terminal, you can usually override it before confirming.

DCC is one of the most commonly overlooked costs in travel budgeting — and one of the easiest to avoid once you know what to look for.

Fees to Know Before You Go

Understanding the fee structure around foreign spending prevents surprises on your statement.

Before traveling, it's worth contacting your bank to confirm exactly which fees apply to your accounts. Some checking accounts and travel-oriented cards waive foreign transaction fees entirely and reimburse ATM surcharges — features worth knowing about before departure, not after. Building these costs into your budget from the start is good practice; see how to build a realistic travel budget for a fuller framework.

This article provides general financial information for educational purposes. It is not personalized financial advice. Fees, rates, and terms vary by provider and change over time — verify current details directly with your bank or card issuer before traveling.