GTIN Check Digit Calculator
Result
GTIN Check Digit Calculator Calculate and validate GTIN/UPC/EAN check digits using the Luhn algorithm. This tool helps retailers, e-commerce platforms, and logistics companies generate correct barcodes and validate product codes for POS systems and shippi — free online calculator.
Formula
- GTIN Check Digit Calculator calculates its result from Product Code (without check digit), GTIN Type (12=UPC-A, 13=EAN, 14=SSCC). It uses the formula Luhn Algorithm: Sum(odd-positioned digits × 3 + even-positioned × 1); Check digit = (10 - (sum mod 10)) mod 10. Change any input to recalculate the result instantly.
- The main inputs are Product Code (without check digit), GTIN Type (12=UPC-A, 13=EAN-13, 14=GTIN-14). Enter them in the units and format shown in the calculator.
- Use monetary amounts, rates and time periods exactly as labeled; the result reflects the assumptions entered on this page.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: GTIN Check Digit
- Product Code (without check digit): 978014300723
- GTIN Type (12=UPC-A, 13=EAN-13, 14=GTIN-14): 13
For the 12-digit EAN body 978014300723, apply right-to-left weights 3,1,3,1… and append the calculated check digit. Leading zeros in the body remain part of the code.
Sample result: Calculating…
Frequently asked questions
What does the GTIN Check Digit calculate?
GTIN Check Digit Calculator Calculate and validate GTIN/UPC/EAN check digits using the Luhn algorithm. This tool helps retailers, e-commerce platforms, and logistics companies generate correct barcodes and validate product codes for POS systems and shippi — free online calculator.
Which values should I enter?
Enter Product Code (without check digit), GTIN Type (12=UPC-A, 13=EAN-13, 14=GTIN-14) using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: GS1 modulo-10 check digit: multiply body digits from right to left by alternating weights 3, 1; digit = (10 − (weighted sum modulo 10)) modulo 10. GTIN-12/13/14 require 11/12/13 body digits. SSCC is an 18-digit identifier, not GTIN-14..
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.