US IBAN Helper & Transfer Detail Checker
The United States does not use IBAN. This calculator helps you validate US transfer details and optionally validate a non-US IBAN when needed.
Does the US have an IBAN?
No. The United States does not participate in the International Bank Account Number (IBAN) system. If someone asks for a “US IBAN,” the correct response is usually to provide standard US bank transfer details instead: routing number, account number, account holder name, bank name/address, and often a SWIFT/BIC code for incoming international wires.
What this US IBAN calculator does
This tool is built for practical use when sending money to a US account or troubleshooting payment forms that request IBAN. Instead of trying to generate a fake IBAN (which should never be done), it checks the details that are actually used in US banking.
- Validates ABA routing number structure and checksum.
- Checks account number length for common US ranges.
- Validates SWIFT/BIC format for international wire instructions.
- Validates real IBANs for non-US destinations using MOD-97.
How to send money to a US bank from overseas
1) Gather the right recipient details
- Account holder full legal name
- US account number
- Routing number (ABA/Fedwire)
- Bank name and branch address
- SWIFT/BIC code (if required by sender bank)
2) Use wire-specific details when required
Some US banks use different routing information for ACH vs domestic wire vs international wire. Always verify with the recipient bank’s official wire instructions before transferring large amounts.
3) Avoid “made-up US IBANs”
Any string claiming to be a US IBAN is invalid. A proper payment instruction for the US never requires a true IBAN. If a website form forces IBAN input for a US account, contact support and request “routing + account number + SWIFT/BIC” entry support.
Routing number checksum (quick explanation)
A US routing number has 9 digits and includes a checksum. The formula uses weighted sums of digits by position:
(3 × digits 1,4,7) + (7 × digits 2,5,8) + (1 × digits 3,6,9), and the total must be divisible by 10.
If this fails, the routing number is likely mistyped or invalid.
Common mistakes this page helps prevent
- Entering spaces or incorrect length in routing numbers
- Confusing SWIFT/BIC with routing number (they are different)
- Attempting to generate a US IBAN
- Submitting non-US IBANs without checksum verification
FAQ
Can I calculate a US IBAN from routing and account number?
No. Because the US has no IBAN format, there is nothing to calculate. Use routing number + account number + SWIFT/BIC for international wires.
Why does my payment form ask for IBAN if I am paying a US account?
Some global forms are built around IBAN countries and may not handle US accounts cleanly. Ask for an alternative input path or contact customer support.
Is SWIFT code mandatory for US transfers?
For domestic US transfers, usually no. For inbound international wires, often yes. Requirements vary by bank and transfer channel.
Bottom line
If you searched for an “IBAN calculator US,” the key takeaway is simple: validate real US banking details instead of generating a non-existent US IBAN. Use the calculator above to catch errors early and reduce transfer delays, rejections, and return fees.