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Last month a friend paid for a €38 dinner in Lisbon and got charged £37.90. At the day's real rate it should have been about £32.50. Nothing shady happened at the restaurant. The card machine simply offered to charge her in pounds, she tapped yes, and the terminal applied its own exchange rate on top of a 2.75% foreign transaction fee.
That's the thing about currency conversion fees. They rarely show up as a line item. They're folded into a rate that's a few percent worse than the one you saw on Google that morning, which is why most people only notice them after they've added up a holiday statement.
Here's how to find them, and how to stop paying them.
Three separate charges get lumped together as "conversion fees", and they behave quite differently.
Run the numbers on a £1,000 conversion at a 3% spread and you've lost £30 without a single fee appearing on your statement. That's the part people miss: the expensive fees are the invisible ones.
This is the single biggest saving available to most travellers, and it takes one word. When a card terminal, hotel desk or cash machine offers to charge you in GBP, USD or whatever your home currency is, say no. Choose the local currency instead.
The prompt is dressed up as a convenience, sometimes with wording like "guaranteed rate" or "you will be charged in your home currency". What it actually does is let the merchant or ATM operator apply their own conversion rate, typically 3% to 6% above the mid-market rate, and pocket the difference. Independent tests across European ATMs have found markups as high as 11% on the worst offenders.
On a card machine, look for a screen asking which currency you'd like to be charged in. On an ATM, the question usually appears after you've entered your PIN. Pick the local currency, and if the machine offers a "continue without conversion" or "decline" button, press it. Your own bank's rate, even with a foreign transaction fee, is almost always cheaper.
A standard high-street debit card abroad will cost you around 2.75% to 2.99% per purchase plus a withdrawal fee. A travel-friendly card charges nothing, and that gap adds up fast on a two-week trip.
In the UK, cards from Starling, Monzo, Chase and Revolut generally charge 0% on spending, with Revolut applying a small markup after a monthly free limit (usually £1,000 on weekdays). The Wise card converts at the mid-market rate with a fee of roughly 0.4%–1% depending on the currency. Similar products exist elsewhere: Schwab's debit card refunds ATM fees worldwide, and Charles Schwab, Capital One Venture and Chase Sapphire customers avoid foreign transaction fees in the US.
Look past the headline "no fees" claim. Ask three questions: is there a monthly free conversion limit, what markup applies at weekends, and are ATM withdrawals free or capped at a few hundred pounds a month? Weekend markups of 0.5%–1% are common because currency markets are closed, and they're easy to avoid by converting money into the local currency on a weekday.
Fixed ATM fees punish small withdrawals. If your bank charges £1.50 plus 2.5% per withdrawal, taking out £50 three times costs far more than taking out £150 once. Multiply that across a family of four and it's a decent meal out.
Stick to ATMs attached to real banks rather than standalone machines in tourist squares. In much of Europe, independent operators like Euronet charge their own fee on top of your bank's, sometimes €5 or €6 per transaction, and they're the ones pushing dynamic currency conversion hardest. During the week is also cheaper than the weekend for most fintech cards.
Airport bureaux de change are the most expensive place on earth to convert money, regularly 8%–12% worse than the mid-market rate. If you need physical cash for a taxi or a market, order it online from a specialist a few days before you travel and collect it at a branch, or have it delivered. You'll typically get within 1%–2% of the mid-market rate, and you'll have time to exchange currency without losing 10% at the airport kiosk if plans change.
For transfers rather than spending, the spread is the whole game. High-street banks routinely charge 3%–5% all-in on an international payment once you combine the transfer fee with their exchange rate. Specialist brokers and services like Wise, OFX or TorFX operate near the mid-market rate for a fraction of that.
On a £5,000 transfer, the difference between a bank's 4% and a broker's 0.5% is £175. It's worth twenty minutes of comparison, and it's worth knowing how to send money abroad without losing 3% on the way before you commit. Once the money is moving, tracking an international money transfer properly also stops you ringing support and paying for a chase-up.
The same trap exists in reverse. If a client or family member abroad sends you money and you ask for it in pounds, the sender's bank converts at its own rate and you never see the markup. Ask to receive it in the sender's currency and let your own account do the conversion, ideally at a rate you can check first.
Correspondent bank fees also bite here: £8–£25 is common on a traditional wire, deducted from the amount that lands. Multi-currency accounts sidestep most of this. There's a fuller walkthrough in receiving money from abroad without losing 4% along the way.
"Zero commission" and "no fees" mean very little on their own. The only number that matters is the effective rate: divide the amount you receive by the amount you paid, then compare that figure to the mid-market rate at the time.
If the mid-market rate is 1.17 USD to the pound and you're quoted 1.13, you're paying about 3.4%, whatever the brochure says. Do that sum once for each provider you're considering and the cheapest option usually becomes obvious within a minute.
The cheapest habit in all of this costs nothing. Before you travel, before you send, before you accept any quote, look up the mid-market rate and write it down. That single number turns every opaque fee into something you can measure.
You won't eliminate conversion costs entirely. Someone, somewhere, has to move the money between currencies. But the gap between a careless 5% and a careful 0.4% on a year of travel, transfers and online shopping is real money, and almost all of it comes from two decisions: always pay in the local currency, and keep the mid-market rate in your head as the benchmark everything else gets judged against.
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