1. What Is CPF Last Digit Calculation?

The CPF (Cadastro de Pessoas Físicas) is the Brazilian individual taxpayer registry identification. The last digit is a verification digit calculated using a specific algorithm to validate the CPF number.

2. How Does The Calculator Work?

The calculator uses the CPF verification algorithm:

Where:

• Sum — Weighted sum of the previous digits
• mod — Modulo operation (remainder after division)

Explanation: The algorithm calculates two verification digits using weighted sums of the previous digits with specific multipliers.

3. Importance Of CPF Validation

Details: CPF validation is crucial for identity verification in Brazil, used in financial transactions, government services, and official documentation.

4. Using The Calculator

Tips: Enter the first 9 digits of a CPF number. The calculator will compute and display the correct verification digits and the complete valid CPF.

5. Frequently Asked Questions (FAQ)

Q1: What is a CPF number?
A: CPF (Cadastro de Pessoas Físicas) is the Brazilian individual taxpayer registry identification used for various official purposes.

Q2: How many digits does a CPF have?
A: A complete CPF has 11 digits: 9 main digits followed by 2 verification digits.

Q3: Why are verification digits needed?
A: Verification digits help prevent errors in CPF transcription and detect fraudulent numbers.

Q4: Can this calculator validate existing CPFs?
A: Yes, you can enter the first 9 digits of any CPF to verify if the last two digits match the calculated verification digits.

Q5: Are there any limitations to this algorithm?
A: While effective for error detection, it doesn't guarantee the CPF is actually registered or valid for use.