Complete fourteen-digit trade item identifiers.
Initialising algorithm engine for GTIN-14 / ITF-14 Calculator...
How GTIN-14 / ITF-14 Calculator Works?
The GTIN-14 / ITF-14 Calculator works by weighting the 13 payload digits 3-1-3-1 from left to right, summing the products, and appending the 14th digit that completes the next multiple of 10. The first digit is the indicator digit 1–8 for packaging levels.
- 1Choose an indicator digit (1–8) for the packaging level, or 9 for variable-measure items.
- 2Append the first 12 digits of the contained item's GTIN-13 without its check digit.
- 3Weight the 13 digits 3, 1, 3, 1… from the left.
- 4Total the 13 products and subtract the last digit of the total from 10 (0 stays 0).
- 5Encode the 14 digits in an ITF-14 or GS1-128 barcode.
GTIN-14 / ITF-14 Calculator Formula
The GTIN-14 formula is d₁₄ = (10 − ((3 × odd-position sum + even-position sum) mod 10)) mod 10.
S = 3 × (d₁ + d₃ + … + d₁₃) + (d₂ + d₄ + … + d₁₂) (GTIN 14 ITF 14) d₁₄ = (10 − (S mod 10)) mod 10 (GTIN 14 ITF 14)
d₁is the indicator digit.d₂…d₁₃come from the base GTIN without its check digit.
Payload: 1001234567890 Weights: 3131313131313 S = 88 Check digit = (10 − (88 mod 10)) mod 10 = 2 GTIN-14 = 10012345678902
GTIN-14 / ITF-14 Calculator Conversion Table
The GTIN-14 conversion table shows how 1 base EAN-13 converts into GTIN-14 numbers for indicator digits 1–8.
| Indicator | Packaging level example | Payload (13 digits) | Check digit | GTIN-14 |
|---|---|---|---|---|
| 0 | Base item (GTIN-13 padded) | 0590123412345 | 7 | 05901234123457 |
| 1 | Inner pack | 1590123412345 | 4 | 15901234123454 |
| 2 | Case | 2590123412345 | 1 | 25901234123451 |
| 3 | Display box | 3590123412345 | 8 | 35901234123458 |
| 4 | Outer case | 4590123412345 | 5 | 45901234123455 |
| 5 | Layer | 5590123412345 | 2 | 55901234123452 |
| 6 | Mixed case | 6590123412345 | 9 | 65901234123459 |
| 7 | Bundle | 7590123412345 | 6 | 75901234123456 |
| 8 | Pallet pack | 8590123412345 | 3 | 85901234123453 |
Indicator 0 pads the base GTIN-13 5901234123457. Indicators 1–8 carry no fixed meaning: each brand owner assigns them to its own packaging levels.
What is GTIN-14 / ITF-14 Calculator?
A GTIN-14 / ITF-14 Calculator is a tool that computes the 14th digit of a Global Trade Item Number for cases, cartons, and other trade units above the consumer unit.
Changing the indicator digit changes the check digit, so each packaging level needs a fresh calculation. ITF-14 symbols print well on corrugated cardboard, which is why distributors favour them for outer cases.
What are the uses of GTIN-14 / ITF-14 Calculator?
There are 4 main uses of the GTIN-14 / ITF-14 Calculator, including carton labelling, warehouse receiving, and EDI messages.
- Carton labelling: Manufacturers print ITF-14 symbols on shipping cases.
- Warehouse receiving: Distribution centres scan case GTINs to book stock by packaging level.
- Electronic Data Interchange (EDI): Suppliers send 14-digit GTINs in purchase orders and despatch advices.
- Packaging hierarchy setup: Master data teams create GTINs for each level of a product hierarchy.