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The table below shows the characters per inch for Code 128. The
table shows the values for numeric data, and for alphanumeric
data at each of the three densities available on the printer. The
characters per inch for your bar code will be somewhere between
these two values, depending on the mixture of numeric and
alphabetic characters. For a precise calculation of the width of
your bar code, refer to the specification for the Code 128 bar
code.
Density Numeric Data Alpha-numeric Data
1 17.48 8.74
2 11.66 5.83
3 8.74 4.37
Quiet Zone
When you estimate the area you’ll need for the bar code,
remember to add the length of the quiet zone. The quiet zone is
an area of white space required at the beginning and end of each
bar code. The minimum size of the quiet zone is 0.10, or 10
times the width of the narrowest bar code element, whichever is
greater. The tables below show the minimum size of the quiet
zone at each density. For wand scanning, the quiet zone should
be 0.25 to 0.35 inch.
Density Quiet Zone
10.10 inch
20.15 inch
30.20 inch
B-4 Code 128 Information