Chilean RUT Validator
ValidatorValidate Chilean RUT and RUN identification numbers instantly. Verifies the Modulo-11 check digit (DV) and formats the number correctly. Free, runs in your browser.
Enter the RUT with or without dots and hyphen. The check digit (DV) can be 0–9 or K.
The check digit is computed using Modulo 11: multiply each digit (right-to-left) by the repeating sequence 2, 3, 4, 5, 6, 7. Sum all products, take the remainder of division by 11, then subtract from 11. If the result is 11 → DV is '0'; if 10 → DV is 'K'; otherwise DV is the result itself.
About this tool
About RUT Validator
This validator checks Chilean RUT and RUN numbers using the official Modulo-11 algorithm. Enter any RUT with or without dots and hyphen and the tool instantly determines whether the check digit (DV) is correct — all computation runs locally in your browser with no network requests.
The validator normalises the input by stripping dots, hyphens, and spaces before checking. It accepts both formatted (12.345.678-5) and unformatted (123456785) input. The check digit can be any digit 0–9 or the letter K. The validator distinguishes between format errors (wrong structure) and arithmetic errors (wrong DV), so you know exactly what is wrong.
Use this validator to verify RUT numbers collected from users before processing them in your backend, to debug why a number is failing validation in your system, or to check if a manually entered RUT is correct. It is also useful for learning how the Modulo-11 algorithm works.
Instant validation with no network requests — all computation runs locally in the browser. The validator accepts flexible input formats and normalises them before checking. Precise error messages distinguish between format errors and wrong check digits, helping you identify the exact problem.
Key Features
- Official Modulo-11 check digit algorithm
- Accepts formatted (12.345.678-5) and plain (123456785) input
- Strips dots, hyphens, and spaces automatically
- Distinguishes format errors from wrong DV
- Shows formatted number, body, and DV on success
- 100% browser-based, no data sent
FAQ
Chilean RUT Validator — Frequently Asked Questions
How does the RUT check digit (DV) work?
The DV is calculated using Modulo 11. Take the RUT number's digits from right to left and multiply each by the repeating weight sequence 2, 3, 4, 5, 6, 7, then repeat. Sum all the products, take the sum modulo 11, and subtract from 11. If the result is 11 the DV is '0'; if 10 the DV is 'K'; otherwise the DV is that digit. Example: for 12345678, the weighted sum is 93, 93 % 11 = 5, 11 − 5 = 6, so DV is 5.
What is the difference between RUT and RUN?
RUT (Rol Único Tributario) is the tax ID used by businesses and individuals for tax purposes. RUN (Rol Único Nacional) is the civil registry ID assigned at birth. In practice, for natural persons (individuals), both numbers are identical — the same number is used as both RUN and RUT. For legal entities (companies), only RUT applies.
Why is the check digit sometimes the letter K?
When the Modulo-11 calculation produces a remainder of 1 (11 − 10 = 1 would give DV 1, but 11 − 1 = 10 which can't be a single digit), the letter K is used. The original Chilean specification chose K to represent 10 in a single character, since a two-digit DV would break the standard format. K is treated as the digit 10 in the Modulo-11 arithmetic.
Can this validator tell if a RUT belongs to a real person or company?
No. This tool only validates the mathematical structure of the check digit. A RUT can be format-valid (correct DV) but not registered in Chile's civil registry or SII (Servicio de Impuestos Internos). To verify whether a specific RUT is assigned to a real individual or company, you would need access to official Chilean government databases.
Tips
- Dots and hyphens are optional — the validator accepts 12.345.678-5 and 123456785
- The check digit K must be entered as a letter, not a number
- Use the RUT Generator on this site to create valid random RUTs for test data
- RUT numbers below 1,000,000 are valid but uncommon — they belong to very early registrations