GSIN Check Digit Calculator

How GSIN Check Digit Calculator Works?

The GSIN Check Digit Calculator works by weighting the 16 payload digits of a Global Shipment Identification Number (GSIN) 1-3-1-3 from left to right and appending the 17th digit.

1. 1Combine the seller's GS1 company prefix with the shipper reference to reach 16 digits.
2. 2Multiply the 8 odd-position shipment digits by 1 and the 8 even-position digits by 3.
3. 3Total the 16 products and take (10 − (S mod 10)) mod 10 as digit 17.
4. 4Encode the 17 digits with Application Identifier (402).

GSIN Check Digit Calculator Formula

The GSIN formula is d₁₇ = (10 − ((odd-position sum + 3 × even-position sum) mod 10)) mod 10.

S = (d₁ + d₃ + … + d₁₅) + 3 × (d₂ + d₄ + … + d₁₆)
d₁₇ = (10 − (S mod 10)) mod 10

• d₁…d₁₆ are the 16 GSIN payload digits (seller's company prefix + shipper reference).
• d₁₇ is the GSIN check digit.
• S is the weighted GSIN sum.

Payload:  0614141123456789
Weights:  1313131313131313
S = 140
Check digit = (10 − (140 mod 10)) mod 10 = 0
GSIN = (402) 06141411234567890

GSIN Check Digit Calculator Conversion Table

The GSIN conversion table lists sample shipment references with their completed GSINs.

What is GSIN Check Digit Calculator?

A GSIN Check Digit Calculator is a tool that completes the 17-digit Global Shipment Identification Number assigned by a seller to a group of logistic units shipped together.

The GSIN meets the World Customs Organization (WCO) requirements for a Unique Consignment Reference (UCR), so customs declarations can reference the same number as transport documents.

What are the uses of GSIN Check Digit Calculator?

There are 3 main uses of the GSIN Check Digit Calculator, including customs references, bills of lading, and shipment grouping.

• Customs references: Exporters use GSINs as the UCR on declarations.
• Bills of lading: Carriers print GSINs on transport documents.
• Shipment grouping: Warehouses link 2 or more SSCCs to 1 GSIN.