How do you generate UPC check digit?

How do you generate UPC check digit?

How to Calculate a UPC Check Digit

  1. Add the digits in the odd-numbered positions (first, third, fifth, etc.)
  2. Add the digits in the even-numbered positions (second, fourth, sixth, etc.).
  3. Add the two results together:
  4. Now what single digit number makes the total a multiple of 10?
  5. 1 is the check digit.

How do you calculate a check digit?

Check Digit Calculation Method

  1. Multiply each digit of the original number by a weighting factor of 1 or 2 as follows: multiply the units digit by 2, the tens digit by 1, the hundreds digit by 2, the thousands digit by 1, and so forth.
  2. Sum the digits of the products from step 1.

How do I find the last digit of a barcode?

The last digit of a barcode number is a calculated check digit. The check digit is calculated from all the other numbers in the barcode and helps to confirm the integrity of your barcode number. Simply enter the ID Number below and the Check Digit Calculator will calculate the last digit for you.

How is the SSCC check digit calculated?

  1. GTIN-8.
  2. GTIN-12.
  3. GTIN-13.
  4. GTIN-14.
  5. SSCC.
  6. STEP 1: Multiply value of each position by.
  7. STEP 2: Add results together to create sum.
  8. STEP 3: Subtract the sum from the nearest equal or higher multiple of ten = CHECK DIGIT.

How do you find the last digit of a number?

To find last digit of a number, we use modulo operator %. When modulo divided by 10 returns its last digit. To finding first digit of a number is little expensive than last digit. To find first digit of a number we divide the given number by 10 until number is greater than 10.

What is the check digit for EAN 13 barcode?

The check digit for an EAN-13 code is calculated as follows:

  1. Count digit positions from the left to the right, starting at 1.
  2. Sum all the digits in odd positions.
  3. Sum all the digits in even positions and multiply the result by 3.

How do I verify a barcode?

Navigate to a website that offers a free check digit calculator such as, or These websites verify if a barcode is valid by matching its check digit, which is the last digit displayed on the barcode.

Are UPC codes free?

Get Free UPC Codes at the Grocery Store UPCs are on the outside of the product packages, so you don’t need to buy anything to get the codes you need to enter sweepstakes. Use your smartphone to snap a quick picture of the UPCs you need to avoid the chance of making a mistake when you write down the code.

Does Amazon sell UPC codes?

Amazon requires every seller to register a GTIN with each product listing available on their marketplace. Amazon sellers can either buy legitimized UPC codes directly from GS1 or purchase through a reseller.

What is an UPC check digit?

The UPC check digit is the twelfth digit, located to the far right of the UPC number. The first 11 digits in a UPC barcode are the assigned company prefix and the company-assigned product number.

How do you find a check digit?

The check digit is calculated by removing all of the letters and substituting them with their appropriate number counterparts. You then take those numbers and multiply them against a weight factor table. You then have 16 numbers which you add together and then divide by 11. The remainder is the check digit.

To compute the check digit use the following formula: 1. Divide the assigned 8-digit in-bond serial number by 7; 2. Multiply the remainder by 7. The remainder is the single digit number after the period. If more than one digit appears as the remainder use only the first digit; 3. Round up that answer to the next whole number.

What is the purpose of a check digit?

Share this item with your network: A check digit, also known as a checksum character, is the number located on the far right side of a bar code. The purpose of a check digit is to verify that the information on the barcode has been entered correctly.