IMEI check digit calculator

Client

When OCR or manual entry corrupts the last digit, a check digit calculator saves time. Paste the IMEI body—this page runs Luhn mod-10 and shows whether the trailing digit matches ISO/IEC expectations for 15-digit GSM IMEIs.

When to use a check digit calculator

Use after barcode misreads, Excel scientific notation damage, or when a supplier file drops the final digit. Always re-scan the physical label when possible.

Privacy: digits are parsed only in your browser—no carrier or GSMA lookup, no upload. Treat device identifiers like any sensitive paste on shared machines.
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A 15-digit IMEI is commonly described as eight-digit TAC + six-digit serial + Luhn check digit; the trailing digit should satisfy ISO/IEC 7812 mod 10 on the full string—same arithmetic as debit/credit PAN checks. A 16-digit IMEISVappends two software version digits instead of exposing the standalone check position; carriers may still relate it to IMEI numbering but this page stops at segmentation and does not certify assignment.

Result

Passes Luhn mod 10 on the 15-digit string.

  • TAC (8): 35693803
  • Serial (6): 564380
  • Check (1): 9

Common use cases

  • Fix transposed digits on warehouse labels before portal entry.
  • Train staff to verify printed check digits on device cartons.
  • Pre-validate CSV columns where the last digit was truncated in export.

Common mistakes to avoid

  • Calculating check digit on a 16-digit IMEISV string

    IMEISV uses a different layout—use IMEISV mode for 16-digit fields.

  • Assuming calculator activates the line

    Math only—no provisioning or carrier query.

  • Ignoring TAC when check digit passes

    Valid Luhn does not prove the TAC matches the printed model—re-read the label.

FAQ

How does the IMEI check digit calculator work?

Luhn mod-10 on the full 15-digit string; suggests corrected last digit when mismatch.

Can I paste 14 digits without the check digit?

Yes—the tool can synthesize the 15-digit candidate for comparison.

Same algorithm as payment card Luhn?

Same mod-10 family—IMEI uses decimal digits with a trailing check position.

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Phrases people search for that match this tool. See the full long-tail keyword index.

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More tools

Related utilities you can open in another tab—mostly client-side.