Chilean RUT Validator Online: Check Digit (0-9, K) Free
Validate a Chilean RUT or compute its check digit with the official modulo 11 algorithm.
Validate Chilean RUT numbers and compute the check digit with the modulo-11 algorithm. Accepts the K format and optional dots.
By VOV · Last updated: October 21, 2026
How it works
RUT numbers are validated with the official modulo-11 algorithm: each digit, right to left, is multiplied by the repeating series 2-3-4-5-6-7, the products are summed, and the check digit is 11 minus the remainder of dividing by 11. A remainder of 11 yields "0" and 10 yields "K". All computation happens in your browser; no data leaves your device.
Frequently asked questions
How is the RUT check digit computed?
Digits are multiplied right-to-left by the repeating series 2-3-4-5-6-7, summed, divided by 11 and subtracted from 11: 11→0, 10→K.
What does a K digit mean?
It is the value 10 of modulo 11, represented by the letter K. It is as valid as any number.
Does the dots-and-dash format matter?
Not for the computation: you can write 12.345.678-5 or 123456785. This tool accepts both.