Cal11 calculator
Search calculator...

Calculate Iban Number Usa

Reviewed by Calculator Editorial Team

An International Bank Account Number (IBAN) is a standardized format for identifying bank accounts across national borders. While IBANs are widely used in Europe, the US banking system traditionally uses other identification methods like routing numbers and account numbers. However, the US has developed its own IBAN-like system called the ABA Routing Transit Number (RTN) and Account Number combination.

What is an IBAN number?

An IBAN (International Bank Account Number) is an internationally agreed standard for identifying bank accounts across European countries. It consists of up to 34 alphanumeric characters that uniquely identify a bank account and its owner.

The IBAN format includes:

  • Country code (2 letters)
  • Check digits (2 digits)
  • Bank account number (up to 30 alphanumeric characters)

While IBANs are primarily used in Europe, the US banking system uses different identification methods. However, the US has developed its own system that combines the ABA Routing Transit Number (RTN) and Account Number.

IBAN for US accounts

For US bank accounts, the IBAN-like system uses the following format:

US IBAN Format: USXX BBBBBBBBBBBBBBBBBBBBBBBB

  • US - Country code for United States
  • XX - Check digits (2 digits)
  • BBBBBBBBBBBBBBBBBBBBBBBB - Bank account number (22 digits)

The US IBAN system is not as widely adopted as in Europe, but it provides a standardized way to represent US bank account information in an international context.

Key differences from traditional European IBANs:

  • Shorter length (26 characters vs. up to 34)
  • Different check digit calculation method
  • Uses ABA routing number and account number combination

How to calculate IBAN for US

Calculating an IBAN for a US account involves several steps:

  1. Combine the ABA routing number and account number
  2. Convert the combined number to a numeric representation
  3. Calculate the check digits
  4. Construct the final IBAN format

Check Digit Calculation:

1. Combine the ABA routing number (9 digits) and account number (up to 17 digits) to form a 26-digit number.

2. Convert each digit to its numeric value (0-9).

3. Calculate the check digits using the following formula:

Check digits = 98 - (modulo of the numeric representation, 97)

For example, if the combined routing and account number is "12345678901234567890123456", the check digits would be calculated as follows:

1. Convert to numeric: 12345678901234567890123456

2. Calculate modulo 97: 12345678901234567890123456 mod 97 = 12

3. Check digits = 98 - 12 = 86

Examples

Here are two examples of calculating IBANs for US accounts:

Example 1

ABA Routing Number: 123456789

Account Number: 012345678901234567

Calculation:

1. Combined: 12345678901234567890123456

2. Modulo 97: 12345678901234567890123456 mod 97 = 12

3. Check digits: 98 - 12 = 86

Result: US8612345678901234567890123456

Example 2

ABA Routing Number: 987654321

Account Number: 98765432109876543210

Calculation:

1. Combined: 9876543219876543210987654321

2. Modulo 97: 9876543219876543210987654321 mod 97 = 45

3. Check digits: 98 - 45 = 53

Result: US539876543219876543210987654321

FAQ

Is the US IBAN system widely used?

No, the US IBAN system is not as widely adopted as in Europe. Most US banks still use traditional identification methods like routing numbers and account numbers.

How do I find my ABA routing number?

You can typically find your ABA routing number on checks, bank statements, or by contacting your bank directly.

Can I use the US IBAN system for international payments?

While the US IBAN system provides a standardized format, international payments typically still use traditional methods like SWIFT codes.

Is the US IBAN system the same as a regular IBAN?

No, the US IBAN system is different from traditional European IBANs. It uses a different format and check digit calculation method.