How is the My Number check digit calculated?

The first eleven digits are multiplied, in order, by 6 5 4 3 2 7 6 5 4 3 2 and summed; 11 minus the remainder of the sum divided by 11 is the check digit, or 0 when the remainder is 0 or 1.

Should I type my real number here?

It never leaves your browser — but a My Number is sensitive, so check only what you must.

Does a valid check digit mean the number exists?

No — only that it is correctly written. Whether it was issued, and to whom, only the issuing authority can say. The checker never makes up numbers either: it checks the ones you type.

Is anything uploaded?

No. The check is worked out in your browser, and nothing you type leaves your computer.

My Number check digit

The My Number check digit, worked out.

Examples temporarily replace the input and settings. You can restore your previous work.

Input0 characters

Output

Paste or type above to see the result here.

Your files stay on your device

This tool runs entirely in your browser. What you paste is processed on your device and is never sent to a server, so it is safe to use with tokens, keys and unpublished text.

Example

Worked example — My Number check digit

Use the following inputs and settings. Keep other settings at the page defaults.

Item	Value
Input	123456789018
kind	mynumber
Output	✓ 1234 5678 9018 — valid My Number
Output	Check digit: 1×6 + 2×5 + 3×4 + 4×3 + 5×2 + 6×7 + 7×6 + 8×5 + 9×4 + 0×3 + 1×2 = 212
Output	212 ÷ 11 = 19 remainder 3 → 11 − 3 = 8 ✓
Output	A correct check digit only means the number is well-formed; it doesn’t mean the number exists or belongs to anyone. Nothing is sent anywhere: the check runs in your browser.

Expected result — ✓ 1234 5678 9018 — valid My Number

How it works

Paste one number a line; dots, dashes and spaces are fine.
Each is checked for its length and its check digits.
The result shows each step of the calculation, and where a number fails.

Frequently asked questions

How is the My Number check digit calculated?: The first eleven digits are multiplied, in order, by 6 5 4 3 2 7 6 5 4 3 2 and summed; 11 minus the remainder of the sum divided by 11 is the check digit, or 0 when the remainder is 0 or 1.
Should I type my real number here?: It never leaves your browser — but a My Number is sensitive, so check only what you must.
Does a valid check digit mean the number exists?: No — only that it is correctly written. Whether it was issued, and to whom, only the issuing authority can say. The checker never makes up numbers either: it checks the ones you type.
Is anything uploaded?: No. The check is worked out in your browser, and nothing you type leaves your computer.