EAN Validator - Check & Calculate EAN-13/EAN-8 Check Digits

Instantly validate any EAN-13 or EAN-8 barcode. Our tool checks the format, length, and check digit based on the official GS1 algorithm.

Full original guide (expanded)

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted text)

Let the 12 digits be $d_1, d_2, \dots, d_{12}$. Weights: $w_1=1, w_2=3, w_3=1, \dots, w_{12}=3$. Sum $S = \sum_{i=1}^{12} (d_i \times w_i)$ Check Digit $C = (10 - (S \pmod{10})) \pmod{10}$

Formula (extracted text)

Let the 7 digits be $d_1, d_2, \dots, d_7$. Weights: $w_1=3, w_2=1, w_3=3, \dots, w_7=3$. Sum $S = \sum_{i=1}^{7} (d_i \times w_i)$ Check Digit $C = (10 - (S \pmod{10})) \pmod{10}$

Variables and units

No variables provided in audit spec.

Sources (authoritative):

Home — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/
Lifestyle Everyday — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/lifestyle-everyday
Miscellaneous — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/subcategories/miscellaneous
GS1 Check Digit Calculator — gs1.org · Accessed 2026-01-19
https://www.gs1.org/services/check-digit-calculator
ISBN-13 Validator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/isbn-validator
Luhn Algorithm (Credit Card) Validator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/luhn-algorithm
Random Number Generator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/random-number-generator

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

Formulas

(Formulas preserved from original page content, if present.)

Version 0.1.0-draft

Citations

Add authoritative sources relevant to this calculator (standards bodies, manuals, official docs).

Changelog

0.1.0-draft — 2026-01-19: Initial draft (review required).