Routing number checker
Check a US ABA routing number before you send money: nine digits, the 3-7-1 check digit, and which Federal Reserve district its first digits point to. Free, no sign-up, nothing leaves your browser.
The starting number is only an example. This checks the format and check digit; it can't tell you which bank a number belongs to, so confirm it with the person you're paying.
What a routing number is
An ABA routing number is a nine-digit code that identifies a bank in the United States. It was introduced by the American Bankers Association in 1910, and US payments still use it to send money to the right bank. Some banks use one number for ACH payments and another for wire transfers.
How the check works
The ninth digit is a check digit. Multiply the digits by 3, 7, 1, 3, 7, 1, 3, 7 and 1 and add them up: for a valid number the total ends in zero. A typo in one digit always breaks the check, so payment systems can catch it before money is sent. Passing does not prove the number belongs to the bank you expect.
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