Although a member of the European Union, Poland uses the złoty for currency instead of the Euro. For more information, see Polish Currency – a practical guide for your trip to Kraków.
Here is are two currency converters to help you work out how much things cost at the current exchange rate. They show the current exchange rate for British Pounds Sterling to Polish Zlotys and US Dollars to Polish Zlotys. (You can select other currencies too using the drop down menus).
One of the best ways to get more money when you exchange is to use a multi-currency debit card like Transferwise or Revolut.
You top-up the card from your home bank account in your home currency and then exchange currencies through an app on your phone at a much better rate than you can get from ATMs or money exchange booths.
That way you can have a Polish Zloty balance on your card and use it in restaurants and for other purchases without having to pay foreign transaction fees.
Our guide How Much Money Do I Need For Kraków? will help you budget a trip to the city.