How is the RUT verifier digit calculated?

Take the body digits right-to-left and multiply by the cycling weights 2,3,4,5,6,7 (restarting at 2). Sum the products, then compute 11 minus the sum modulo 11. A result of 11 gives verifier 0, a result of 10 gives K, otherwise the result is the verifier digit.

How accurate is this checker?

The modulo-11 algorithm is exact, including the K case, so a wrong verifier digit is always caught. A valid verifier means the RUT is well-formed, not that it is registered with the SII or Registro Civil, which this tool never contacts.

When is the verifier digit the letter K?

When the modulo-11 result equals 10, the verifier is written as the letter K rather than a two-digit number. A result of 11 maps to 0, and all other results are the digit itself.

What is the difference between a RUT and a RUN?

They share the same number and the same check-digit algorithm. RUT (Rol Único Tributario) is the tax identifier and RUN (Rol Único Nacional) is the national ID; this tool checks both identically.

Is my RUT sent anywhere?

No. The checker is privacy-first — all processing happens locally in your browser and the RUT never leaves your device.

Chile RUT / RUN Checker

A Chilean RUT (Rol Único Tributario, the tax ID) or RUN (national ID) is written as a body of up to eight digits plus a verifier digit, like 12.345.678-5. This checker recomputes the verifier from the body using the official modulo-11 algorithm, compares it with the one you entered, and shows the number neatly formatted with dot separators. It is built for catching typos in forms and data — it never contacts any government system.

How it works

The verifier digit (dígito verificador, DV) is derived from the body digits. Reading the body right to left, each digit is multiplied by a cycling weight series 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 gives verifier 0, a resto of 10 gives K, and any other value is the verifier digit itself. The checker compares this computed DV with the character you typed.

Example

For the body 12.345.678, weighting the digits right to left and summing gives a modulo-11 result of 5, so the verifier is 5 — the full RUT is 12.345.678-5.

RUT body	Verifier (DV)
12.345.678	5
11.111.111	1
9.000.000	4

It is privacy-first: nothing leaves your browser. The checker verifies the modulo-11 digit only — it never confirms the RUT against the SII or the Registro Civil.