Calculate an IBAN

IBAN Calculator

Calculate IBAN check digits from a country and complete BBAN.

Use bank details from a trusted source. This calculates format and check digits; it does not verify the account or beneficiary.

Choose the country that issued the domestic bank details.

Input method
Structured fields
Identifies the bank within the selected country's domestic payment system. Find it in bank-issued account details, a statement, or online banking; it may be called a bank, routing, or clearing code. Enter exactly 5 characters (digits only) from those details.
This is a country-specific part of the domestic account format. Copy it from the complete bank-issued domestic account details or ask the bank which value belongs here. Enter exactly 1 character (digits only) from those details.
This is a country-specific part of the domestic account format. Copy it from the complete bank-issued domestic account details or ask the bank which value belongs here. Enter exactly 16 characters (letters or digits) from those details.

Calculation runs in your browser. Your bank details are not sent to our server.

Active registry: Swift IBAN Registry, Release 102.

How the IBAN calculation works

  1. Choose the country that issued the domestic account details.
  2. Enter the complete BBAN or, where supported, its registered components.
  3. The calculator validates the national structure and calculates ISO MOD 97-10 check digits.
  4. The completed IBAN is validated again before it is shown.

Frequently asked questions

What is a BBAN?

A BBAN is the national part of an IBAN. It follows the two-letter country code and two check digits, and its structure differs by country.

Does a calculated IBAN prove that an account exists?

No. A successful result proves registered format and checksum consistency only. It does not confirm the account, owner, status, or payment reachability.

Are my account details sent to a server?

No. Calculation and validation run in this browser. The complete BBAN and calculated IBAN are not sent to our server or placed in the URL.

Related IBAN tools

Source information

Country formats come from Swift IBAN Registry Release 102, published in June 2026. We verify and store the source privately; this tool does not include Swift contact details.

Swift IBAN Registry – official source