Thai ID Validator

Check a Thai ID number's format and checksum without verifying its owner or issuance.

Productivity

Share this tool

Thai ID Number (13 digits)

Enter 13 digits (0/13 entered)

›How validation works (algorithm)

Thai ID Checksum Formula:

How to Use

A checksum pass does not prove issuance, identity, citizenship or ownership. This tool does not query a government database. Avoid entering someone else’s private ID just to test it.

Convert year numbers between Buddhist Era and Common Era using a 543-year offset.

Calculate calendar age for a birth date and chosen reference date.

Set minutes and seconds for a countdown with start, pause and reset controls.

Generate a password with a chosen length and selected character groups.

Compare current times for the fixed set of cities displayed by the tool.

Calculate adult BMI from weight and height using the displayed category thresholds.