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Tools / GTIN-14 Check Digit Calculator
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GTIN-14 Check Digit Calculator

Complete a 13-digit GTIN body or validate a full GTIN-14.

Example values are filled in. Change them to match your job; results update automatically.

How to use this tool ↓

Your inputs

Replace the example values with your own.

Leading zeros are preserved. GTIN-14 uses numeric digits only.

Calculated result

Identifier typeGTIN-14
Check digit7
Complete number10012345000017
1×3 + 0×1 + 0×3 + 0×1 + 0×3 + 5×1 + 4×3 + 3×1 + 2×3 + 1×1 + 0×3 + 0×1 + 1×3 = 33 Check digit = (10 − (33 mod 10)) mod 10 = 7
This calculator checks modulo-10 arithmetic only. It does not verify allocation, ownership, licensing, or GS1 certification.

How to use this calculator

  1. Choose calculation or validation.
  2. Enter 13 digits to calculate the final digit, or all 14 digits to check an existing number.
  3. Read the result and preserve leading zeros when copying it into another system.

A correct final digit does not confirm a GS1 licence or product registration.

Formula and method

Starting at the rightmost body digit, multiply alternating digits by 3 and 1, add the products, and choose the digit that completes the next multiple of ten.

Read the methodology and source notes →

Worked example

For body 1001234500001, the weighted sum requires check digit 7, producing GTIN-14 10012345000017.

How to interpret the result

GTIN-14 is commonly used to identify trade-item groupings. The first digit can participate in packaging-level numbering, but allocation decisions remain with the responsible GS1 licence holder.

Limitations

A valid check digit does not confirm ownership, allocation, product data, packaging level or authorization to use the number.

Primary references

Related tools

Related guides

Usage instructions updated October 19, 2026.
Last reviewed: