UPC-E Barcode FAQ

UPC-E doesn't have a check digit encoded explicitly; rather the check digit is encoded in the parity of the other six characters. The check digit that is encoded is the check digit from the original UPC-A barcode.

Additionally, UPC-E may only be used if the number system is 0 or 1. The characters encoded are encoded with odd and even parity from the left-hand columns of the EAN-13 character formats in the table previously provided. The parity used for each character depends on the number system (0 or 1) and the check digit from the original UPC-A barcode.

UPC-E PARITY ENCODING TABLE

1. If the manufacturer code ends in 000, 100, or 200, the UPC-E code consists of the first two characters of the manufacturer code, the last three characters of the product code, followed by the third character of the manufacturer code. The product code must be 00000 to 00999.
2. If the manufacturer code ends in 00 but does not qualify for #1 above, the UPC-E code consists of the first three characters of the manufacturer code, the last two characters of the product code, followed by the digit "3". The product code must be 00000 to 00099.
3. If the manufacturer code ends in 0 but does not quality for #1 or #2 above, the UPC-E code consists of the first four characters of the manufacturer code, the last character of the product code, followed by the digit "4". The product code must be 00000 to 00009.
4. If the manufacturer code does not end in zero, the UPC-E code consists of the entire manufacturer code and the last digit of the product code. Note that the last digit of the product code must be in the range of 5 through 9. The product code must be 00005 to 00009.

This may be easier to visualize in the following table:

If you have a 6-digt UPC-E code you may use the following logic to convert it back to UPC-A. The decision on which logic to use depends on the last digit of the UPC-E Code.

1. UPC-E code ends in 0, 1, or 2: The UPC-A code is determined by taking the first two digits of the UPC-E code, taking the last digit of the UPC-E code, adding four 0 digits, and then adding characters 3 through 5 from the UPC-E code.
2. UPC-E code ends in 3: The UPC-A code is determined by taking the first three digits of the UPC-E code, adding five 0 digits, then adding characters 4 and 5 from the UPC-E code.
3. UPC-E code ends in 4: The UPC-A code is determined by taking the first four digits of the UPC-E code, adding five 0 digits, then adding the fifth character from the UPC-E code.
4. UPC-E code ends in 5, 6, 7, 8, or 9: The UPC-A code is determined by taking the first give digits of the UPC-E code, adding four 0 digits, then adding the last character from the UPC-E code.

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