GLN Check Digit Calculator

How GLN Check Digit Calculator Works?

The GLN Check Digit Calculator works by applying GS1 weights 1-3-1-3 from left to right to the 12-digit payload of a Global Location Number (GLN) and appending the 13th digit.

1. 1Combine the GS1 company prefix with the location reference to get 12 digits.
2. 2Multiply location digits in odd positions by 1 and in even positions by 3.
3. 3Sum the products.
4. 4Write (10 − (S mod 10)) mod 10 as the 13th GLN digit.

GLN Check Digit Calculator Formula

The GLN formula is d₁₃ = (10 − (Σ dᵢ·wᵢ mod 10)) mod 10, with wᵢ = 1, 3, 1, 3… from the left.

S = (d₁ + d₃ + … + d₁₁) + 3 × (d₂ + d₄ + … + d₁₂)   (GLN)
d₁₃ = (10 − (S mod 10)) mod 10   (GLN)

• d₁…d₁₂ are the 12 GLN payload digits (company prefix + location reference).
• d₁₃ is the GLN check digit.
• S is the weighted GLN sum.

Payload:  401234500001
Weights:  131313131313
S = 34
Check digit = (10 − (34 mod 10)) mod 10 = 6
GLN = 4012345000016

GLN Check Digit Calculator Conversion Table

The GLN conversion table lists sample location types with their 12-digit payloads and completed GLNs.

What is GLN Check Digit Calculator?

A GLN Check Digit Calculator is a tool that completes a 13-digit Global Location Number by computing its GS1 check digit. A GLN identifies a legal entity, a function, or a physical location such as a store, warehouse, or dock door.

GLNs appear in EDI messages, GS1-128 labels with Application Identifiers (AI) 410–417, and the GS1 Registry Platform.

What are the uses of GLN Check Digit Calculator?

There are 4 main uses of the GLN Check Digit Calculator, including EDI partner setup, location master data, and logistics labels.

• EDI partner setup: Trading partners exchange GLNs for invoicing, ordering, and delivery points.
• Location master data: Retailers assign GLNs to stores, warehouses, and departments.
• Logistics labels: Shippers encode ship-to GLNs with AI (410) on pallet labels.
• Healthcare traceability: Hospitals identify care sites in GS1 healthcare systems.