Basically, by multiplying the conversion rate by the amount you want to exchange. For EUR 500, you would need 1.13 x 500 = $650. But, the FXLeaders exchange rate calculator makes life very easy. It offers the exchange rate of a single unit of currency for another, as well as the total amount of foreign currency in exchange for the amount of the currency you want to exchange. Physical currency exchange comes with exchange rates and/or fees, but the closer to the FXLeaders exchange rate/amount, the better the deal from your FX exchange agent.