Bank Account Number Calculator

This bank account number calculator helps you verify and format account numbers for various banking systems. Whether you're working with IBAN, SWIFT, or other account number formats, this tool provides quick validation and formatting.

What is a Bank Account Number?

A bank account number is a unique identifier assigned to a bank account by the financial institution. These numbers can take different forms depending on the country and banking system used. Common types include:

IBAN (International Bank Account Number)
SWIFT/BIC codes
Sort code and account number combinations
Routing numbers (used in the US)

These numbers are essential for international payments, direct deposits, and financial transactions. The calculator helps ensure these numbers are correctly formatted and verified.

How to Use This Calculator

Using our bank account number calculator is simple:

Select the country where the account is held
Enter the account number in the provided field
Click "Calculate" to verify and format the number
Review the results and formatted account number

Note: The calculator provides basic validation. For official verification, always contact your bank or use official banking systems.

Common Account Number Formats

Account numbers vary by country and banking system. Here are some common formats:

Country	Format	Example
United Kingdom	Sort code (6 digits) + Account number (8 digits)	20-45-78 \| 12345678
United States	Routing number (9 digits) + Account number (variable)	123456789 \| 12345678
European Union	IBAN (up to 34 alphanumeric characters)	GB29 NWBK 6016 1331 9268 19

Bank Account Verification Process

The verification process typically involves:

Checking the account number format against country standards
Validating the check digits (where applicable)
Cross-referencing with the bank's records
Ensuring the account is active and belongs to the correct account holder

Check digit validation formula (simplified):

For IBANs: The first four characters are the country code and check digits. The remaining characters are rearranged and checked using a modulus 97 operation.

Frequently Asked Questions

What is the difference between an account number and an IBAN?

An account number is a basic identifier for a bank account, while an IBAN (International Bank Account Number) is a standardized format used for international transactions. IBANs include the country code, check digits, and the basic bank account number.

How do I find my bank account number?

Your bank account number is typically found on checks, bank statements, or online banking accounts. For international transactions, you may need the IBAN instead.

Can I use this calculator for international payments?

This calculator helps format and verify account numbers, but for actual international payments, you should use your bank's official systems or consult with a financial advisor.