Check the current conversion rate between the euro and U.S. dollar. This can be done online by typing in "currency conversion" in the search field of your favorite search engine. You will be able to chose from a number of websites that provide updated information on currency exchange rates throughout the world. You can also find rates in many newspapers and other publications.
Multiply the total number of euros by 1.4052 (or the current USD rate) to get your total of U.S. dollars. For example, if you have 95 euros, you would multiply 95 by 1.4052, which equals approximately 135.06 -- your total number of U.S. dollars.
Exchange the currency at large banks or other financial institutions. Airports and other places often feature exchange counters, as well.