Chilean RUT validator
Check or calculate the Chilean RUT check digit, including K, and format the number.
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Tool guide
Chilean RUT validator: how it works
Practical information to understand the result and use this tool correctly.
About Chilean RUT validator
A Chilean RUT (rol único tributario) is a body of 7 or 8 digits plus a check digit from 0 to 9 or K.
The digit uses weights 2 through 7 from the right, then 11 minus the sum modulo 11. 11 becomes 0 and 10 becomes K.
This is not the Spanish DNI letter or the Argentine CUIT. Dots and the dash are formatting only.
How to use it
- 1Paste a RUT with or without dots, such as 12345678-5 or 12.345.678-5.
- 2Leave the check digit off to calculate it, or include it to verify.
- 3Copy the formatted RUT. A mismatch shows the expected digit.
Frequently asked questions
- Why can the check digit be K?
- When 11 minus the modulo is 10, Chilean RUT uses the letter K instead of a number.
- Is 12.345.678-5 valid?
- Yes. The body 12345678 has check digit 5. 11.111.111-1 is also valid.
- Does this look up the person at the SII?
- No. It only checks the local modulo-11 digit. It does not query the Chilean tax service.