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GS1 Check Digit Calculator |
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Calculation of the Check Digit:
GS1 Identification Numbers |
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GTIN-8 below is for International use only |
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GTIN-12 (U.P.C.)
The Check Digit for a GTIN-12 (U.P.C.) ID Number is figured using the standard modulo calculation. Here is how it works: |
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Step One: |
Suppose you want to find the Check Digit for the GTIN-12 (U.P.C.) Number 61414121022. Set up a table with 12 columns, and put the number 61414121022 into Positions One through Eleven. Position Twelve will be blank because it is reserved for the Check Digit. |
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Step Two: |
Add the numbers in Positions One, Three, Five, Seven, Nine, and Eleven:
(6 + 4 + 4 + 2 + 0 + 2 = 18). |
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Step Three: |
Multiply the result of Step Two by three:
(18 x 3 = 54). |
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Step Four: |
Add the numbers in Positions Two, Four, Six, Eight, and Ten:
(1 + 1 + 1 + 1 + 2 = 6). |
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Step Five:
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Add the results of Step Three and Step Four:
(54 + 6 = 60). |
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Step Six: |
The Check Digit is the smallest number needed to round the result of Step Five up to a multiple of 10. In this example, the Check Digit is 0. |
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GTIN-13
The Check Digit for a GTIN-13 or GLN ID Number is figured using the standard modulo calculation. Here is how it works: |
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Step One: |
Suppose you want to find the Check Digit for the GTIN-13 or GLN ID Number 101454121022. Set up a table with 13 columns, and put the number 101454121022 into Positions One through Twelve. Position Thirteen will be blank because it is reserved for the Check Digit. |
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Step Two: |
Add the numbers in Positions Two, Four, Six, Eight, Ten, and Twelve:
(0 + 4 + 4 + 2 + 0 + 2 = 12). |
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Step Three: |
Multiply the result of Step Two by three:
(12 x 3 = 36). |
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Step Four: |
Add the numbers in Positions One, Three, Five, Seven, Nine, and Eleven:
(1 + 1 + 5 + 1 + 1 + 2 = 11). |
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Step Five: |
Add the results of Step Three and Step Four:
(36 + 11 = 47). |
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Step Six: |
The Check Digit is the smallest number needed to round the result of Step Five up to a multiple of 10. In this example, the Check Digit is 3. |
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GTIN-14
The Check Digit for a GTIN-14 ID Number is figured using the standard modulo calculation. Here is how it works: |
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Step One: |
Suppose you want to find the Check Digit for the GTIN-14 ID Number 9101454121022. Set up a table with 14 columns, and put the number 9101454121022 into Positions One through Thirteen. Position Fourteen will be blank because it is reserved for the Check Digit. |
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Step Two: |
Add the numbers in Positions One, Three, Five, Seven, Nine, Eleven, and Thirteen:
(9 + 0 + 4 + 4 + 2 + 0 + 2 = 21). |
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Step Three: |
Multiply the result of Step Two by three:
(21 x 3 = 63). |
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Step Four: |
Add the numbers in Positions Two, Four, Six, Eight, Ten, and Twelve:
(1 + 1 + 5 + 1 + 1 + 2 = 11). |
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Step Five: |
Add the results of Step Three and Step Four:
(63 + 11 = 74). |
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Step Six: |
The Check Digit is the smallest number needed to round the result of Step Five up to a multiple of 10. In this example, the Check Digit is 6. |
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SSCC
The Check Digit for a Serial Shipping Container Code (SSCC) Number is figured using the standard modulo calculation. Here is how it works: |
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Step One: |
Suppose you want to find the Check Digit for the SSCC ID Number 10614141192837465. Set up a table with 18 columns, and put the number 10614141192837465 into Positions One through Seventeen. Position Eighteen will be blank because it is reserved for the Check Digit. |
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Step Two: |
Add the numbers in Positions One, Three, Five, Seven, Nine, Eleven, Thirteen, Fifteen, and Seventeen:
(1 + 6 + 4 + 4 + 1 + 2 + 3 + 4 + 5 = 30). |
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Step Three: |
Multiply the result of Step Two by three:
(30 x 3 = 90). |
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Step Four: |
Add the numbers in Positions Two, Four, Six, Eight, Ten, Twelve, Fourteen, and Sixteen:
(0 + 1 + 1 + 1 + 9 + 8 + 7 + 6 = 33). |
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Step Five: |
Add the results of Step Three and Step Four:
(90 + 33 = 123). |
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Step Six: |
The Check Digit is the smallest number needed to round the result of Step Five up to a multiple of 10. In this example, the Check Digit is 7. |
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Shipment ID (Bill of Lading) Number
The Check Digit for a Shipment ID (Bill of Lading) Number is figured using the standard modulo calculation. This is the format described in the VICS Standard Bill of Lading (BOL) document. Here is how it works: |
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Step One: |
Suppose you want to find the Check Digit for the Shipment ID Number 0614141192837465. Set up a table with 17 columns and put the number 0614141192837465 into Positions One through Sixteen. Position Seventeen will be blank because it is reserved for the Check Digit. |
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Step Two: |
Add the numbers in Positions Two, Four, Six, Eight, Ten, Twelve, Fourteen, and Sixteen:
(6 + 4 + 4 + 1 + 2 + 3 + 4 + 5 = 29). |
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Step Three: |
Multiply the result of Step Two by three:
(29 x 3 = 87). |
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Step Four: |
Add the numbers in Positions One, Three, Five, Seven, Nine, Eleven, Thirteen, and Fifteen:
(0 + 1 + 1 + 1 + 9 + 8 + 7 + 6 = 33). |
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Step Five: |
Add the results of Step Three and Step Four:
(87 + 33 = 120). |
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Step Six: |
The Check Digit is the smallest number needed to round the result of Step Five up to a multiple of 10. In this example, the Check Digit is 0. |
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Price Check Digit (North American POS Product Sold by Weight/Measure) |
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The Price Check Digit is used only for random weight or variable measure products sold at the retail POS (see Section 3.1 of the Guidelines for Supply Chain Identification). These products are identified with VMN-12 where the U.P.C. Prefix is 2 (Position One is Number 2). Here is how to calculate the Price Check Digit: |
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Step One: |
Convert the four digits (numbers) in the four-digit price to new numbers by finding their new value in the tables below: (NOTE: These "new numbers" never appear in the bar code or human readable text. They are only used for Price Check Digit calculation.)
For the first two digits:
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If the digit is: |
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The new digit will be: |
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For the third digit:
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If the digit is: |
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The new digit will be: |
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For the fourth digit:
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If the digit is: |
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The new digit will be: |
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Say, for example, the four digits in the price are 0512. By using the tables above, new values would be assigned to each of the four numbers before using them in Step Two. For example the value of 0 (first digit) would remain 0, the value of 5 (second digit) would change to 9, the value of 1 (third digit) would change to 3, and the value of 2 (fourth digit) would change to 9. This means the new values would be represented as 0939. |
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Step Two: |
Add the four new digit values:
(0 + 9 + 3 + 9 = 21). |
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Step Three: |
Multiply the result of Step Two by 3:
(21 x 3 = 63). |
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Step Four: |
The Price Check Digit is always the number in the units position (right-most digit) of the result of Step Three. For example, because the result in Step Three is 63, the Price Check Digit in our example is 3, because 3 is the right-most digit.
Additional Information: For further details on this subject, see Guideline 11 (Random Weight) in the GTIN-12 (U.P.C.) Guidelines. |
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GTIN-8 (For International Use Only)
The Check Digit for a GTIN-8 ID Number is figured using the standard modulo calculation. Here is how it works: |
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Step One: |
Suppose you want to find the Check Digit for the GTIN-8 ID Number 4321012. Set up a table with eight columns, and put the number 4321012 into Positions One through Seven. Position Eight will be blank because it is reserved for the Check Digit. |
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Step Two: |
Add the numbers in Positions One, Three, Five, and Seven:
(4 + 2 + 0 + 2 = 8). |
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Step Three: |
Multiply the result of Step Two by three:
(8 x 3 = 24). |
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Step Four: |
Add the numbers in Positions Two, Four, and Six:
(3 + 1 + 1 = 5). |
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Step Five: |
Add the results of Step Three and Step Four:
(24 + 5 = 29). |
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Step Six: |
The Check Digit is the smallest number needed to round the result of Step Five up to a multiple of 10. In this example, the Check Digit is 1. |
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Definitions |
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GTIN |
Trade Items, i.e. (products and services), Global Trade Item Number (GTIN)
The GS1 System identifier for trade items, which encompasses both products and services. GTINs provide the capability to deliver unique identification worldwide. The most recognized and used GTIN is the U.P.C. [top] |
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GLN |
Locations, i.e. (legal, functional, and physical entities), Global Location Number (GLN)
Certain distributors/retailers/trading partners may require a company to identify LOCATIONS with GLN identification numbers. (This would be specifically requested of your company.) These are SEPARATE and DIFFERENT numbers than the U.P.C. numbers. When your company becomes a member of GS1 US, you will have the capacity to create GLN identification numbers when this is requested of you. Click on "Keys to the GS1 System." [top] |
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