Currency used in Sri Lanka is the Sri Lankan rupee, written LKR or Rs. You can exchange euros and dollars at the airport or in the banks and exchange offices throughout the country (There is not a big difference between the exchange offered by the airport and that of a bank or an exchange agency).
When you need to change money your driver will tell you the nearest location.
Credit cards and debit cards are accepted in most hotels.
It is important not to have restrictions on payments in Asian areas, check with the issuing bank.
A current conversion is always be calculated and updated through the web of Central Bank of Sri Lanka