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Iban Calculator From Account Number

Reviewed by Calculator Editorial Team

This IBAN calculator helps you convert traditional account numbers into International Bank Account Numbers (IBANs). The IBAN system provides a standardized way to identify bank accounts across national borders, making international payments more efficient and reducing errors.

How to Use This Calculator

To use this IBAN calculator from account number:

  1. Enter your country code (e.g., GB for United Kingdom, DE for Germany)
  2. Enter your bank code (typically 4-8 digits)
  3. Enter your account number (typically 8-10 digits)
  4. Click "Calculate IBAN" to generate your IBAN
  5. Review the result and verify the IBAN format

The calculator will automatically format the IBAN in groups of 4 characters separated by spaces for better readability.

What is an IBAN?

An International Bank Account Number (IBAN) is an internationally agreed system of identifying bank accounts across national borders. It eliminates the need to use multiple forms of account identification when dealing with international payments.

IBANs are standardized across Europe and are used for:

  • Domestic payments
  • Cross-border payments
  • Direct debits
  • Standing orders

IBANs were introduced in 1994 and have since become the standard for identifying bank accounts in Europe. The system is maintained by the European Committee for Banking Standards (ECBS).

IBAN Format and Structure

An IBAN consists of up to 34 alphanumeric characters and has a specific structure:

  1. Country code (2 letters)
  2. Check digits (2 digits)
  3. Bank code (variable length)
  4. Account number (variable length)

For example, a UK IBAN might look like: GB82 WEST 1234 5698 7654 32

IBAN Structure Formula:

IBAN = Country Code + Check Digits + Bank Code + Account Number

Conversion Process

The conversion process involves several steps:

  1. Convert the account number and bank code to a numerical representation
  2. Combine the country code, bank code, and account number
  3. Calculate the check digits using the IBAN algorithm
  4. Format the final IBAN with proper spacing

The IBAN algorithm uses modulo 97 to calculate the check digits, ensuring the IBAN is valid.

Check Digit Calculation:

Check Digits = 98 - (Modulo 97 of (IBAN without check digits))

Examples

Here are some examples of how account numbers convert to IBANs:

Country Bank Code Account Number IBAN
Germany 12345678 9876543210 DE89 1234 5678 9876 5432 10
France 20041 010050500013M02606 FR14 2004 1010 0505 0001 3M02 606
Spain 2100 0123456789 ES91 2100 0418 4502 0005 1332

Frequently Asked Questions

What is the difference between an IBAN and a bank account number?
An IBAN is a standardized international identifier for bank accounts, while a bank account number is specific to a particular country's banking system. The IBAN includes the country code, check digits, bank code, and account number.
Is an IBAN the same as a SWIFT code?
No, an IBAN identifies a bank account, while a SWIFT code identifies a specific bank or financial institution. Both are needed for international payments.
How do I verify an IBAN is correct?
You can verify an IBAN using the check digits calculation. The IBAN must pass the modulo 97 test to be valid. Our calculator includes this validation.
Can I use this calculator for any country?
Yes, this calculator can generate IBANs for most countries that use the IBAN system. Simply enter the appropriate country code, bank code, and account number.