ISMN Check Digit Calculator

How ISMN Check Digit Calculator Works?

The ISMN Check Digit Calculator works by applying EAN-13 weights 1-3-1-3 to the 12-digit payload that begins with 979-0 and appending the 13th digit. Every International Standard Music Number (ISMN) starts with 9790.

1. 1Enter the 12-digit ISMN payload starting with 9790.
2. 2Multiply the music-number digits in odd positions by 1 and in even positions by 3.
3. 3Sum the products.
4. 4Take the ISMN check digit as (10 − (S mod 10)) mod 10.

ISMN Check Digit Calculator Formula

The ISMN formula is d₁₃ = (10 − (Σ dᵢ·wᵢ mod 10)) mod 10, applied to 9790 + publisher + item.

S = 39 + (d₅ + d₇ + d₉ + d₁₁) + 3 × (d₆ + d₈ + d₁₀ + d₁₂)
(prefix 9790 contributes 9 + 9 + 3×7 + 3×0 = 39)
ISMN check = (10 − (S mod 10)) mod 10

• 9790 is the fixed ISMN prefix.

Payload:  979026000043
Weights:  131313131313
S = 72
Check digit = (10 − (72 mod 10)) mod 10 = 8
ISMN = 979-0-2600-0043-8

ISMN Check Digit Calculator Conversion Table

The ISMN conversion table lists sample music editions with their check digits and the legacy M-format.

The legacy form replaced 9790 with M. The check digit stays the same in both forms.

What is ISMN Check Digit Calculator?

An ISMN Check Digit Calculator is a tool that computes the final digit of a 13-digit International Standard Music Number for printed and digital sheet music.

ISMN moved from the 10-character M-format to the 13-digit 979-0 format in 2008. The 13-digit form encodes directly as an EAN-13 barcode.

What are the uses of ISMN Check Digit Calculator?

There are 3 main uses of the ISMN Check Digit Calculator, including score publishing, music retail, and library cataloguing.

• Score publishing: Music publishers complete ISMNs for new editions.
• Music retail: Shops scan ISMN barcodes on sheet music.
• Library cataloguing: Music libraries verify ISMNs in catalogue records.