ISSN Check Digit Calculator

How ISSN Check Digit Calculator Works?

The ISSN Check Digit Calculator works by multiplying the first 7 digits of an International Standard Serial Number (ISSN) by weights 8 down to 2 and taking the modulus 11 complement as the 8th character. A result of 10 is written as X.

1. 1Enter the 7-digit ISSN payload.
2. 2Multiply the digits by 8, 7, 6, 5, 4, 3, and 2.
3. 3Sum the products.
4. 4Compute (11 − (S mod 11)) mod 11 and write 10 as X.
5. 5Format the result as NNNN-NNNC.

ISSN Check Digit Calculator Formula

The ISSN formula is d₈ = (11 − (Σ (9 − i)·dᵢ mod 11)) mod 11, with 10 written as X.

S = 8·d₁ + 7·d₂ + 6·d₃ + 5·d₄ + 4·d₅ + 3·d₆ + 2·d₇
d₈ = (11 − (S mod 11)) mod 11,  10 → X

• d₁…d₇ are the ISSN payload digits.

2 × 8 = 16
0 × 7 = 0
4 × 6 = 24
9 × 5 = 45
3 × 4 = 12
6 × 3 = 18
3 × 2 = 6
S = 121
Check = (11 − (121 mod 11)) mod 11 = 0
ISSN = 2049-3630

ISSN Check Digit Calculator Conversion Table

The ISSN conversion table lists sample serial titles with their ISSN check characters and EAN-13 barcode form.

The EAN-13 column uses price/variant code 00. Publishers change those 2 digits for issue variants.

What is ISSN Check Digit Calculator?

An ISSN Check Digit Calculator is a tool that computes the 8th character of an International Standard Serial Number. An ISSN identifies journals, magazines, newspapers, and other serial publications.

Print and online editions of the same serial receive different ISSNs. The ISSN International Centre in Paris coordinates the network of national ISSN centres.

What are the uses of ISSN Check Digit Calculator?

There are 3 main uses of the ISSN Check Digit Calculator, including journal metadata, magazine barcodes, and library holdings.

• Journal metadata: Publishers check ISSNs in Crossref and indexing submissions.
• Magazine barcodes: Publishers build 977-prefix EAN-13 barcodes from the ISSN.
• Library holdings: Librarians verify ISSNs in serials catalogues.