ABA Routing Number Validator
Validate 9-digit US ABA/routing numbers using the published checksum formula. All processing runs in your browser.
Length
Checksum
Normalized
Important disclaimer
Format and checksum only. A passing result does not prove the number is assigned to a bank, that an account exists, or that funds can be transferred.
Privacy: Validation runs entirely in your browser. Nothing is sent to our servers.
Do not enter real account numbers together with routing numbers on untrusted sites.
Checksum rule (ABA)
3×(d1+d4+d7) + 7×(d2+d5+d8) + (d3+d6+d9) ≡ 0 (mod 10)
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