Luhn Algorithm or Modulus 10 Calculator
This online tool will calculate/validate the luhn digit number for any cards.
Results...
Initial number:
Step1 : Starting with the second-to-last digit and moving to the left, double every second digit:
Step2 :If the result of the doubling is a two-digit number, add those 2 digits together:
Step3 :Now take the sum of all the digits:
Sum = (7 + 9 + 9 + 4 + 7 + 6 + 9 + 7 + 7 + 2 + 0) = 67
67 mod 10 =
1, that means this number is Not Valid.
Info: If you change the last digit from 0 to 3, the sum will be 70, and the number will be valid.
What is Luhn-Algorithm
The Luhn algorithm or Luhn formula is also known as modulus 10 (or) mod 10 algorithm.
This formula used to validate a variety of identification numbers.
Example :
Credit card numbers
Social Security Numbers (SSNs).
IMEI numbers
National Provider Identifier numbers
Steps to calculate the luhn check digit:
Step 1) From the rightmost digit, which is the check digit, moving left, double the value of every second digit;
Step 2) If the product of this doubling operation is greater than 9, then sum the digits of the products or alternatively subtract 9 from the product.
Step 3) Take the sum of all the digits.
Step 4) Sum value Mod 10.
Step 5) Result = 1 , that means this number is Not Valid.
Result = 0 , that means this number is Valid.
See Also ►