Decide on how much currency you want to convert. Step 2. Determine the currency exchange rate for the current day. Visit a currency conversion website like Unit The worst day to change euros in Bangladeshi takas was the Thursday, 20 February 2020 . The exchange rate had fallen to its lowest value. 100.00 euros = 9 To convert 20 EUR to US Dollars you have to multiply 20 x 1.119, since 1 EUR is 1.119 USD. So, if you want to calculate how many US Dollars are 20 Euros you can use this simple rule.