What is a T.C. Kimlik No.?

The T.C. Kimlik No. (Türkiye Cumhuriyeti Kimlik Numarası) is the 11 digit identity number of every Turkish citizen, printed on the ID card and asked for by banks, hospitals and government sites. Unlike many European ID numbers, it holds nothing about the person: no birth date, no gender. The first digit is never 0, and the last two digits are check digits that catch most typos.

How the check digits work

Take the first nine digits and add up two groups:

  • odd places: digits 1, 3, 5, 7 and 9
  • even places: digits 2, 4, 6 and 8

The 10th digit is (7 × odd sum - even sum) mod 10, the last digit of the result. When the result is negative, add 10 until it isn't.

The 11th digit is the sum of the first ten digits, mod 10. Since that works out to 8 × the odd sum, mod 10, the last digit of a valid number is always even.

Tool description

Enter a T.C. Kimlik No. and the tool checks its length, its first digit and both check digits. For a valid number it shows the two sums and how each check digit comes out of them. When the check digits are wrong, it tells you which ones the first nine digits give.

A valid result means the number is well formed. Whether it belongs to a real person only the population register (NVI) can tell.

The number is checked in your browser and never sent anywhere.

Features

  • Checks the length, the first digit and both check digits
  • Shows the sums and the formula behind each check digit
  • Gives the right check digits when they don't match