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Charts like this, printed at [[poster]] size, are widely posted on machine shop walls for handy reference by machinists as they work. For some tasks it is faster and less annoying to glance down a column of numbers on a poster than it is to punch calculator buttons or do penciled arithmetic. It is also true that with long experience, talented machinists have much of the chart memorized anyway (with decimals to truncated thou). But the poster is there for reference and quick sanity check as needed. Tool distributors often give away such charts as [[promotional merchandise]].
For anyone looking to create such a poster or to tailor the design and colors to their own preferences, it is useful to realize that [[spreadsheet]] software makes this fast and easy to do. The tools that the software provides—formulas, cell formatting with rounding, autofill, and sorting by numerical order—obviate any manual calculation and data entry. For example, one can create the inch nominal rows for the chart—with columns for inch fraction, inch decimal, and corresponding millimeter decimal conversion—using formulas, cell formatting with rounding, and autofill; and one can then create the metric nominal rows below that, with the inch decimal conversions being
[[File:Decimal-fraction equivalents--v0006.svg|frameless|center|600px|Decimal-fraction equivalents]]
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