The short answer to the question of what currency to take when travelling: keep the bulk of your money on a card, and carry a small cash reserve in euros or US dollars depending on the region. There is no one-size-fits-all wallet. In Europe a euro card carries you through, in Turkey you will struggle without cash, and somewhere in Southeast Asia dollars can be prized above the local money. The traveller's real mistake is rarely how much they brought. It is where they exchanged it and how they paid.
Let's break it down properly: when to use cash, when to use plastic, which currency to carry as backup and how much. And where you will almost certainly get shortchanged on the rate if you are not paying attention.
Cash or card: what should be your default?
For most destinations a card covers roughly eighty percent of your spending: hotels, cafes, supermarkets, tickets, car rental. It is convenient and safe, because a lost card can be blocked in a minute while a lost wad of notes is gone for good. Still, leaving cash at home is a bad idea.
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Cash saves you where the card reader is either broken or simply absent: a fruit stall, a private driver, tips, entry to some small museum, a ticket machine, a car park. In many countries small cash payments make up half of the everyday situations you actually run into. So the working setup is simple: card as your main tool, cash as insurance and small change.
One detail people rarely mention. In some places a card payment on a small amount comes with a fee, or the vendor just grumbles and asks you to pay in cash. Keeping the equivalent of twenty or thirty euros in your pocket is handy for exactly those moments.

Which currency should you carry in cash?
A simple rule applies here. Carry the currency that is easy and cheap to exchange at your destination, or that is accepted directly. In practice this is almost always euros or US dollars, even when you are heading somewhere that runs on entirely different money.
- Euros: the obvious pick for all of Europe and for many Mediterranean resorts. Inside the eurozone you pay with them directly, in neighbouring countries you exchange them at a good rate.
- US dollars: they work better across Asia, parts of Africa, Latin America, and anywhere the dollar is historically treated as a hard currency. In some hotels and tours prices are even quoted in dollars.
- Local currency in advance: buying the whole amount at home makes little sense, since the rate is usually worse. It is smart to grab just a little for the first day (a ride from the airport, water, a snack) and change the rest once you arrive.
Take notes in smaller denominations. Few people will want to break a five-hundred-euro bill, but twenties and fifties are accepted without a fuss. And check the condition of your banknotes: in some Asian countries a creased or slightly torn dollar bill may simply be refused.
Where to exchange, and where you get shortchanged?
The rule that saves you the most sounds dull but holds true: never change money at the airport or the hotel. These are the two worst rates in any country. The gap versus a normal exchange office in town can be noticeable, and sometimes you hand over close to a third of the amount extra for nothing.
What to watch for when exchanging:

- The buy and sell rates side by side. If the spread between them is wide, the office is earning far too much on you.
- The fee on top. The board shows a lovely rate, then the counter adds a percentage. Ask for the final figure before you agree.
- Dynamic conversion at the terminal. When an ATM or till offers to charge you "in your home currency", decline and choose the local one. That way your own bank handles the conversion, not a foreign terminal at a robbery rate.
Withdrawing cash is also cheaper from a large local bank's ATM rather than the standalone machines like Euronet in tourist zones. The latter love to take their own fee and hand you a worse rate on top.
Multicurrency cards and ATMs: how to stop feeding the bank fees
A separate story that quietly eats your budget is the fees for withdrawals and conversion. This is where multicurrency cards and accounts help, letting you hold several currencies at once and pay in the one that matches the country, with no double conversion.
A few working habits:
- Find out your bank's foreign withdrawal fee in advance. Sometimes it pays to take out one larger sum rather than run to an ATM every day.
- Pay by card in the currency the price is listed in. The terminal often offers to charge you in your home currency, and that is nearly always a trap with a poor rate.
- Keep two cards from different payment systems in different places. If one gets blocked or a terminal refuses it, the other bails you out.
How much cash should you bring?
There is no exact figure, because it all depends on the country and your travel style. The working benchmark is simple: enough cash to last two or three days if something suddenly goes wrong with the card. For an ordinary European trip that is usually the equivalent of one to two hundred euros in small notes. For countries where cash rules everything, bring a bigger cushion.

Split your money across different spots. Some in your wallet, some in another bag, a little in the hotel safe. That way losing a single wallet does not leave you with nothing at all. It sounds paranoid right up until the day it pays off.
Regional advice: a quick cheat sheet
Below is a summary table that makes it easier to orient yourself before you even fly out. These are general pointers rather than an iron law, so check the current details before your trip: currency import rules and card acceptance change.
| Region / country | Cash or card | Which currency to take |
|---|---|---|
| Eurozone (France, Germany, Spain, Italy) | Mostly card, cash for small change | Euros |
| United Kingdom | Card almost everywhere | Pounds (minimal cash) |
| Turkey | Card in cities, cash in bazaars and regions | Euros or dollars to exchange, lira on the spot |
| Balkans, Georgia, Armenia | A mix, cash needed more often | Euros to exchange |
| Southeast Asia (Thailand, Vietnam) | Cash dominates outside big cities | Dollars to exchange, local in hand |
| Egypt, North Africa | Cash matters, card not everywhere | Dollars or euros |
| United States | Card is universal, cash for tips | Dollars |
A few extra notes to the table. In Turkey it is better to settle in lira on the spot, since the currency is unstable and holding large sums in it makes no sense. In Asia the dollar often acts as a reserve currency: it is accepted in tourist spots and easy to change, yet small purchases still call for local cash. Scandinavia is the opposite, where cash is sometimes taken reluctantly and a card becomes mandatory.
The takeaway: a working formula
If you boil it all down to one scheme, the sensible thing to take on a trip is two cards from different systems as your base, a small cash reserve in euros or dollars suited to the region, and just a little local currency for the first day. Exchange in town rather than at the airport, always pay in the terminal's local currency, and never keep all your money in one pocket. This combination covers almost any journey without stress and without overpaying for nothing.