How is a Turkish TC Kimlik No validated?

Three rules apply. The first digit cannot be zero, the tenth digit equals ((sum of the odd-position digits times 7) minus the sum of the even-position digits) modulo 10, and the eleventh digit equals the sum of the first ten digits modulo 10.

Does the TC Kimlik No contain a date of birth?

No. Unlike many national ID numbers, the Turkish T.C. Kimlik No encodes no date of birth or sex — it is a sequential number with two arithmetic check digits.

Is my ID number uploaded anywhere?

No. The validator runs entirely in your browser with client-side JavaScript — your number is never uploaded or stored.

How many digits is a TC Kimlik No?

Exactly 11 digits. A number with any other length cannot be valid, and the tool only evaluates once 11 digits are present.

Why can't the first digit be zero?

A leading zero would make it effectively a 10-digit number, so by rule the first digit of a valid T.C. Kimlik No is always 1 to 9.

Does a valid check digit guarantee the person exists?

No. Passing the check digits means the number is internally consistent and free of common typos. Only the MERNIS civil register can confirm it belongs to a real, registered person.

What are the odd and even positions in the formula?

Odd positions are the 1st, 3rd, 5th, 7th and 9th digits; even positions are the 2nd, 4th, 6th and 8th. The 10th-digit rule combines those two sums.

Turkey TC Kimlik No Validator

Turkish T.C. Kimlik No validator

This tool validates a Turkish T.C. Kimlik No — the 11-digit national identification number — by applying its three official check rules. It is for form validation, HR and KYC checks, and confirming a typed number is internally consistent. The number carries no personal data; this is a check-digit validator only.

How it works

For an 11-digit number, three rules must all hold:

1) first digit ≠ 0
2) digit 10 = ((d1+d3+d5+d7+d9) × 7 − (d2+d4+d6+d8)) mod 10
3) digit 11 = (d1 + d2 + … + d10) mod 10

Rule 2 combines the odd-position sum (digits 1, 3, 5, 7, 9) and the even-position sum (digits 2, 4, 6, 8). Rule 3 is simply the sum of the first ten digits, modulo 10. The tool reports each rule’s pass/fail and the expected check digit so you can spot a typo.

Example

For 10000000146: the odd-position digits (1st, 3rd, 5th, 7th, 9th) are 1, 0, 0, 0, 1 summing to 2, and the even-position digits (2nd, 4th, 6th, 8th) are all 0 summing to 0, so digit 10 should be (2×7 − 0) mod 10 = 14 mod 10 = 4 — matches. The first ten digits sum to 6, so digit 11 should be 6 — matches. With a non-zero first digit, all three rules pass and the number is valid.

Everything runs in your browser, so the number you enter is never uploaded. This is a check-digit validator only — it does not confirm the number against the MERNIS civil register.