Brazilian CPF Check Digit Calculator

How Brazilian CPF Check Digit Calculator Works?

The Brazilian CPF Check Digit Calculator works by computing 2 modulus 11 digits: the first with weights 10 down to 2 over 9 digits, and the second with weights 11 down to 2 over 10 digits.

1. 1Enter the first 9 digits of the Cadastro de Pessoas Físicas (CPF).
2. 2Multiply by 10, 9, … 2, sum, and take r = S mod 11; the first digit is 0 when r < 2, else 11 − r.
3. 3Append the first digit.
4. 4Multiply the 10 digits by 11, 10, … 2, sum, and apply the same rule for the second digit.
5. 5Format as XXX.XXX.XXX-XX.

Brazilian CPF Check Digit Calculator Formula

The CPF formula is DVₖ = 0 if (Sₖ mod 11) < 2, else 11 − (Sₖ mod 11), applied twice.

S₁ = Σ dᵢ × (11 − i),  i = 1…9
DV₁ = 0 if S₁ mod 11 < 2 else 11 − (S₁ mod 11)
S₂ = Σ dᵢ × (12 − i),  i = 1…10 (DV₁ included)
DV₂ = 0 if S₂ mod 11 < 2 else 11 − (S₂ mod 11)

• d₉ shows the fiscal region that issued the CPF.

S₁ = 162, r = 8, DV₁ = 3
S₂ = 204, r = 6, DV₂ = 5
CPF = 111.444.777-35

Brazilian CPF Check Digit Calculator Conversion Table

The CPF conversion table lists sample bases with both check digits and the fiscal region digit.

What is Brazilian CPF Check Digit Calculator?

A Brazilian CPF Check Digit Calculator is a tool that computes the 2 check digits of an 11-digit Brazilian individual taxpayer number. The Receita Federal issues the CPF.

Sequences of 1 repeated digit (such as 111.111.111-11) pass the formula but are not valid CPFs, so validators reject them separately.

What are the uses of Brazilian CPF Check Digit Calculator?

There are 3 main uses of the Brazilian CPF Check Digit Calculator, including e-commerce checkout, Pix registration, and invoicing.

• E-commerce checkout: Brazilian stores require a CPF for invoices (NF-e).
• Pix keys: Banks validate CPFs registered as Pix keys.
• Invoicing: Companies check CPFs on electronic invoices.