It's wise to arrive in Ireland with least €300 euros in cash. In the worst case scenario, your debit or credit card might not work upon arrival in Ireland. Or it may get lost. In this unlikely event, you'll need backup.
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Resist the urge to buy foreign currency before your trip.Some tourists feel like they just have to have euros or British pounds in their pockets when they step off the airplane, but they pay the price in bad stateside exchange rates. Wait until you arrive to withdraw money.
But if you pay in euros, you'll get a rotten exchange rate. Ideally, if you're in a non-euro country for more than a few hours, head to the ATM and use local currency instead. Use your credit card to get cash only in emergencies.
Buy currency before you travel.Doing so gives you time to shop around for the best rate. Plus, when you arrive, you won't have to immediately find a bank or currency exchange. Do some research ahead of time to see if US dollars are widely accepted at places you plan to go to.
Before your trip, it's best to exchange money at your bank or credit union, which likely offers better rates and fewer and/or lower fees. Your bank or credit union may buy back leftover foreign currency in exchange for dollars when you return.
Most US, UK and Australian debit and credit cards should be usable in Ireland. Visa, Mastercard (Cirrus and Maestro) and American Express are all widely accepted. However, you may have a little more trouble using a Diner's Club card, and Discover isn't often accepted in Ireland.
This is so entirely dependent on your own travel preferences that it's tough to estimate but we recommend putting aside roughly €700 to €1700 for spending money for one week in Europe.