ABA Routing Number Validator
Check whether a US routing number is valid.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator validates a 9-digit US ABA routing number using its built-in checksum: each of the nine digits is multiplied by a fixed weight (3, 7, 1, repeating), the products are summed, and a valid routing number's sum must be evenly divisible by 10. This single check digit catches most typos and transcription errors before a transfer is attempted.
Bank employees, accountants, payroll processors, and developers building ACH or wire transfer forms use it to catch invalid routing numbers before submitting a transaction, avoiding failed or misdirected payments. Enter the 9-digit routing number to check whether it passes the checksum.
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