IMEI Checksum Calculator

Enter first 14 digits of IMEI:

Methodology

The last digit of a 15-digit IMEI number is a checksum.

Calculating the IMEI (International Mobile Equipment Identity) checksum involves using the Luhn algorithm, which is a simple checksum formula used to validate a variety of identification numbers. Here's how you can calculate it:

1. Double every second digit from right to left. If this doubling results in a number greater than 9, add the two digits of the product to get a single digit.

2. Sum all the digits, including those that were doubled and those that were not.

3. Calculate the checksum digit, which is the difference between the sum and the next multiple of 10.