Free tool
IMEI check digit calculator
Type the first 14 digits of an IMEI and get the 15th digit, the Luhn check digit, instantly.
FreeResults in ~10 s
How it works
- 01Enter 14 digits.
- 02The check digit is calculated as you type.
- 03Copy the full 15-digit IMEI.
How the Luhn check digit works
Starting from the right, every second digit is doubled and digits above 9 are reduced by 9. The check digit is what brings the total up to the next multiple of 10.
Anatomy of an IMEI
Every IMEI has the same 15-digit structure. Each part tells you something different.
350020981234564
TAC#1–8
Type Allocation Code. Identifies the manufacturer and exact model. The first two digits are the reporting body.
Serial#9–14
Unique number the manufacturer assigns to this single device.
Check digit#15
Calculated from the other 14 with the Luhn formula. Catches typos.
Frequently asked questions
Why does an IMEI have a check digit?
It catches typos: changing any single digit makes the checksum fail.
Do all IMEIs use Luhn?
Yes, every 15-digit IMEI ends in a Luhn check digit. IMEISV numbers don't have one.
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