Routing number checker
Enter a 9-digit routing number to check that it is valid and see which bank it belongs to. Free, with no sign-up, and no account number needed.
0 of 9 digits
Enter all 9 digits to check the number.
Where to find your routing number
The routing number is printed on every check, along the bottom edge in a special font. The three groups of numbers from left to right are the routing number (nine digits), your account number, and the check number. Your bank's website or mobile app also lists it.
How a routing number is validated
The last digit of a routing number is a check digit. To test a number, multiply its digits by 3, 7, 1, 3, 7, 1, 3, 7, 1 in order, add the results, and divide by 10. If there is no remainder, the number passes. This catches most typing mistakes, such as a swapped or wrong digit, but it cannot tell you the account is open or belongs to you.
Passing the test and appearing in the directory means the number is formatted correctly and is a real bank identifier. Always confirm the routing number with your bank before you use it for payroll, direct deposit or a wire transfer.
Read the parts of a check explained, what MICR is and why it is used on checks, and how to set up your first check in Check Writer 123.
Frequently asked questions
What is a routing number?
A routing number, also called an ABA number or routing transit number, is a nine-digit code that identifies a US bank or credit union. It appears on the bottom left of a check and is used to route checks and electronic payments to the right institution.
Where do I find the routing number on a check?
Look at the line of numbers along the bottom edge of the check. The first group of nine digits, on the left, is the routing number. The next group is your account number, followed by the check number.
How does this tool know a number is valid?
Every routing number has a built-in check digit. Multiply the digits by 3, 7 and 1 in a repeating pattern and add them up. A valid number's total is a multiple of 10. The tool also looks the number up in the public Federal Reserve routing directory to name the bank.
Is it safe to type a routing number here?
A routing number identifies a bank, not you, and it is printed on every check, so it is not secret. This tool never asks for an account number, and we do not save what you enter. Never share your account number, login or PIN with a tool you do not trust.
Is the routing number the same for every payment type?
Not always. Some banks use one routing number for checks and ACH transfers and a different one for wire transfers. Use the number printed on your checks for checks, and ask your bank which number to use for wires.
Can I print checks with my routing number?
Yes. With Check Writer 123 you enter your routing and account numbers once, and every check you print carries the correct bank number line. The app also checks the routing number as you type it.
Print checks with the right bank line, every time
Enter your routing and account numbers once and Check Writer 123 prints the bank number line on every check, positioned for you.
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