What is the RUT verifier digit?

The verifier (dígito verificador, DV) is the last character of a RUT. It is computed from the body digits with the modulo-11 algorithm and can be 0–9 or the letter K.

How is the Chilean RUT verifier calculated?

Take the body digits right to left, multiply by the cycling weights 2,3,4,5,6,7, sum the products, then compute 11 minus (sum modulo 11). A result of 11 becomes 0, 10 becomes K, otherwise the digit itself.

What does it show if my verifier digit is wrong?

It flags the RUT as invalid and shows the correct verifier digit it computed, along with the properly formatted RUT, so you can fix a typo immediately.

Can the verifier digit be the letter K?

Yes. When the modulo-11 result is 10, the verifier is written as K. A result of 11 maps to 0, and other results are the digit itself.

Is my RUT sent anywhere?

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

Chile RUT Validator — Gera Tools

A Chilean RUT (Rol Único Tributario) or RUN (national ID) ends in a verifier digit that protects against typos. This validator recomputes that verifier from the body digits, tells you whether the one you entered is correct, and — if it is wrong — shows the correct digit and a properly formatted RUT. It is a check-digit validator for catching errors in forms and data, and never queries any official register.

How it works

The verifier digit (dígito verificador) is calculated from the body. Reading the body right to left, each digit is multiplied by the cycling weights 2, 3, 4, 5, 6, 7 (restarting at 2 after 7). The products are summed, then:

resto = 11 − (sum mod 11)

A resto of 11 becomes verifier 0, a resto of 10 becomes K, and any other value is the verifier digit itself. The validator compares this against the character you supplied and reports a match or mismatch.

Example

For the body 12.345.678, the algorithm produces a verifier of 5, so 12.345.678-5 is valid. If you entered 12.345.678-4, the validator marks it invalid and shows 5 as the correct digit.

RUT	Valid?
12.345.678-5	Yes
11.111.111-1	Yes
12.345.678-4	No (should be 5)

Everything runs in your browser, so the RUT you enter is never uploaded. This is a check-digit validator only — it does not confirm the RUT against the Servicio de Impuestos Internos or the Registro Civil.