# IMEI Calculator

Some of imei number only have 14 number or longer than 15 number. This tool use to calculate last number of imei number to check sum or validate imei. Final result is valid 15 imei number, you can copy and use. To find your IMEI number, type *#06# on the phone keyboard, or is located in the battery compartment. Please enter the 15 digits, without any other character.
IMEI 0

The last number of the IMEI is a check digit calculated using the Luhn algorithm.

The Check Digit (calculated by manufacturer) is a function of all other digits in the IMEI.
The purpose of the Check Digit is to help guard against the possibility of incorrect entries to the CEIR and EIR equipment.

The check digit is validated in three steps:

1. Starting from the right, double a digit every two digits (e.g., 5 → 10).
2. Sum the digits (e.g., 10 → 1+0). Check if the sum is divisible by 10.
3. Conversely, one can calculate the IMEI by choosing the check digit that would give a sum divisible by 10.

For example:

IMEI 49015420323751?

 IMEI Double every other Sum digits 4 9 0 1 5 4 2 0 3 2 3 7 5 1 ? 4 18 0 2 5 8 2 0 3 4 3 14 5 2 ? 4 + (1 + 8) + 0 + 2 + 5 + 8 + 2 + 0 + 3 + 4 + 3 + (1 + 4) + 5 + 2 + ? = 52 + ?

To make the sum divisible by 10, we set ? = 8, so the IMEI is 490154203237518.

Source Wikipedia

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