Luhn Algorithm Calculator
What is Luhn Algorithm?
The Luhn algorithm, also known as the “modulus 10” or “mod 10” algorithm, is a checksum formula used to validate various identification numbers, such as credit card numbers, Canadian Social Insurance Numbers, and other numerical identifiers. Created by IBM scientist Hans Peter Luhn in 1954, it’s designed to protect against accidental errors like single digit misprints or transposition of adjacent digits.
How to Use the Luhn Algorithm Calculator
Step 1: Enter the number you want to validate in the input field. The number can be a credit card number or any other identification number that uses the Luhn algorithm.
Step 2: Click the “Validate” button to process your number. The calculator will automatically remove any non-digit characters.
Step 3: Review the results displayed in the result box. You’ll see:
- The original number you entered
- The calculated checksum
- The total sum from the algorithm
- Whether the number is valid or invalid according to the Luhn algorithm
Step 4: Examine the detailed calculation steps shown below the results to understand how the validation was performed. Each step shows how individual digits were processed according to the Luhn formula.
Step 5: For invalid numbers, you can use the calculated checksum to determine what the last digit should be to make the number valid under the Luhn algorithm.