IBAN Calculator: lets you convert a national account number into an IBAN, validate an IBAN, find bank information. Correctness guaranteed. Enter IBAN number. To send a payment to the EU and EEA (including Switzerland), the IBAN number is required. (An IBAN is a unique I.D. number for a. IBAN Calculator - Convert a bank account number to IBAN. View BIC code, branch address and relevant information for international bank wire transfer.