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Calculate Iban From Bank Code and Account Number

Reviewed by Calculator Editorial Team

An IBAN (International Bank Account Number) is a standardized format for identifying bank accounts across European countries. It helps ensure accurate and efficient international money transfers. This guide explains how to calculate an IBAN from your bank code and account number, including the formula, assumptions, and practical examples.

What is an IBAN?

An IBAN is a unique identifier for bank accounts in Europe. It consists of up to 34 alphanumeric characters and follows a specific format:

  • Country code (2 letters)
  • Check digits (2 digits)
  • Bank code (variable length)
  • Account number (variable length)

The IBAN is used for international wire transfers to ensure accurate delivery of funds. It replaces older systems like SWIFT codes and provides a more standardized approach to identifying bank accounts.

How to Calculate IBAN

Calculating an IBAN from your bank code and account number involves several steps:

  1. Combine your country code, bank code, and account number
  2. Convert the alphanumeric string to a numerical representation
  3. Calculate the check digits using the modulo 97 operation
  4. Format the result into the standard IBAN format

The process requires careful handling of alphanumeric characters and mathematical operations to ensure the IBAN is valid.

Formula Used

IBAN Calculation Formula

The IBAN is calculated using the following steps:

  1. Concatenate the country code, check digits (initially 00), bank code, and account number
  2. Convert each character to its numerical value (A=10, B=11, ..., Z=35)
  3. Calculate the modulo 97 of the resulting number
  4. Subtract the result from 98 to get the check digits
  5. Insert the check digits into the IBAN

The formula ensures that the IBAN is mathematically valid and can be used for international transfers.

Worked Example

Let's calculate an example IBAN for a German bank account:

  • Country code: DE
  • Bank code: 12345678
  • Account number: 987654321

The calculated IBAN would be: DE89 1234 5678 9876 5432 10

This example demonstrates how the formula is applied in practice to generate a valid IBAN.

Frequently Asked Questions

What is the format of an IBAN?

An IBAN consists of up to 34 alphanumeric characters divided into groups of 4 characters separated by spaces. It includes the country code, check digits, bank code, and account number.

How do I verify an IBAN is correct?

You can verify an IBAN by using the modulo 97 operation on the numerical representation of the IBAN. If the result is 1, the IBAN is valid.

Can I use an IBAN for international transfers?

Yes, an IBAN is specifically designed for international wire transfers to ensure accurate delivery of funds across European countries.