EnglishIMEI Calculator
Validate the 15th Digit with IMEI Info’s Free Tool
Use IMEI Info’s free IMEI Calculator to validate the 15th check digit of any IMEI number using the Luhn algorithm. Ensure your IMEI is valid, accurate, and compliant with mobile security standards.
IMEI Calculator – Validate the 15th Digit with IMEI Info’s Free Tool
Welcome to the free IMEI Calculator by IMEI Info – your trusted online tool to instantly calculate and verify the IMEI check digit of any mobile device. Whether you're a mobile user, technician, or telecom professional, our IMEI validation tool ensures that your device’s 15-digit IMEI number is correct, secure, and ready for use in global mobile networks.
What is an IMEI Number?
An IMEI (International Mobile Equipment Identity) is a 15-digit unique code used to identify mobile devices globally. It is essential for:
- Tracking lost or stolen phones
- Blacklisting devices
- Registering phones with telecom carriers
- Ensuring device legitimacy in systems like CEIR (Central Equipment Identity Register) and EIR (Equipment Identity Register)
The 15th digit of the IMEI is a check digit calculated using the Luhn algorithm . This digit is not random; it confirms that the first 14 digits are entered correctly and are structurally valid.
Why Use the IMEI Calculator from IMEI Info?
Our IMEI Calculator is a fast, free, and reliable tool that allows you to:
- Calculate the 15th check digit from a 14-digit IMEI
- Verify the correctness of your full 15-digit IMEI number
- Prevent registration errors in mobile equipment identity registers
- Comply with GSMA and telecom industry standards
- Quickly validate IMEIs before repairs, unlocks, or transfers
All results are based on the Luhn algorithm , a proven mathematical formula used worldwide in validating numeric codes like credit cards and IMEIs.
How the IMEI Check Digit is Calculated – The Luhn Algorithm
The Luhn algorithm is a checksum formula used to validate identification numbers. It’s a three-step process:
Double Every Second Digit (from the Right)
Take the first 14 digits of the IMEI. Starting from the right , double every second digit:
Example :
- IMEI (first 14 digits): 35145120840121
- Doubled digits: (1x2,1x2, 4x2, 0x2, 1x2, 4x2, 5x2)
- Results: (2,2,8,0,2,8,10)
Sum All Digits
Add the digits together. If any results are double digits, add their individual digits:
- For example, 10 becomes 1 + 0 = 1
- Total sum: all the digits of the modified numbers + untouched digits
- (3 + 1 + 5 + 2 + 8 + 0 + 2) + (1 + 8 + 2 + 0 + 8 + 2 + 2) = 44
Example :
Choose the Check Digit
Find the 15th digit (check digit) that makes the total divisible by 10(44/10=50) :
- Check digit = 50 − 44 = 6
- Final IMEI: 351451208401216 (where 6 is the check digit)
Benefits of Using IMEI Info’s IMEI Calculator
Using our tool provides multiple benefits:
Accuracy & Reliability
- Powered by the Luhn algorithm , the globally accepted method for IMEI validation.
- Eliminates the risk of invalid or incorrectly formatted IMEIs .
Industry-Grade Utility
- Mobile service centers
- Telecom operators
- Retailers and resellers
- App developers
- General mobile users
Fast & Easy to Use
- Simply enter the first 14 digits of the IMEI.
- Instantly get the correct 15th digit without any delay.
Secure & Free
Who Should Use an IMEI Check Digit Calculator?
The IMEI Info Check Digit Calculator is ideal for:
- Mobile phone users who want to verify device authenticity
- Second-hand phone buyers who need to check for tampered IMEIs
- Technicians and repair professionals ensuring IMEI consistency
- Telecom operators needing to validate data before registration
- Software and API developers working on mobile device tools
Avoid Invalid IMEI Entries in CEIR and EIR Systems
When a device is added to the CEIR or EIR systems, a wrong IMEI could:
- Result in device rejection
- Cause errors in blacklisting or tracking
- Lead to legal or warranty issues
By using the IMEI Info IMEI Calculator , you avoid these issues by ensuring your IMEI is complete, correct, and industry-compliant.
How to Use the IMEI Calculator
- Find your device’s 14-digit IMEI (usually on the device box, under battery, or by dialing *#06#)
- Visit the IMEI Calculator page on IMEI Info
- Enter the first 14 digits
- Click on Calculate
- Get the correct 15th check digit instantly
Conclusion: Trust IMEI Info for Precise IMEI Validation
The IMEI Calculator from IMEI Info is the most efficient way to:
- Validate your IMEI number
- Calculate the check digit
- Comply with mobile tracking and security standards
Whether you're a tech enthusiast or an industry professional, this tool helps you maintain device integrity, ensure security, and reduce data entry errors.
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