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United States
Check a nine-digit ABA routing number against its checksum and Federal Reserve prefix before it goes on an ACH form or a wire.
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An ABA routing transit number identifies a US bank or credit union. The first two digits place it in one of the twelve Federal Reserve districts, or mark it as a thrift, an electronic-only number or a government number. The last digit is a check digit.
The digits are multiplied by 3, 7 and 1 in turn and added up. A valid routing number always gives a total that divides exactly by ten. One wrong digit always breaks this, which is why it catches most typing mistakes.
Many banks publish one routing number for ACH transfers and direct deposits and another for wires. Both can be valid. Use the one your bank lists for the kind of payment you are making.
Correct bank details are half of a good transfer. The other half is what it costs: the fee and the exchange-rate margin.
FAQ
It is printed at the bottom left of a US cheque and shown in your bank's app or website, usually under account details.
Usually not on its own. Transfers from abroad normally need the receiving bank's SWIFT/BIC code; some providers also ask for the routing number.
It confirms the number is well-formed and sits in an assigned range. It does not name the bank: the official directory is licensed, not public. Your bank can confirm the number.
No. The check runs in your browser.
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