Each row is one sixteenth of an inch. The second column is the same length as a decimal inch, the third is millimeters, and the last says which mark it is on a tape measure.
Sixteenths of an inch
| Fraction | Decimal inch | Millimeters | Mark on the tape |
|---|---|---|---|
| 1/16 | 0.0625 | 1.59 | Sixteenth |
| 1/8 | 0.1250 | 3.18 | Eighth |
| 3/16 | 0.1875 | 4.76 | Sixteenth |
| 1/4 | 0.2500 | 6.35 | Quarter |
| 5/16 | 0.3125 | 7.94 | Sixteenth |
| 3/8 | 0.3750 | 9.53 | Eighth |
| 7/16 | 0.4375 | 11.11 | Sixteenth |
| 1/2 | 0.5000 | 12.70 | Half |
| 9/16 | 0.5625 | 14.29 | Sixteenth |
| 5/8 | 0.6250 | 15.88 | Eighth |
| 11/16 | 0.6875 | 17.46 | Sixteenth |
| 3/4 | 0.7500 | 19.05 | Quarter |
| 13/16 | 0.8125 | 20.64 | Sixteenth |
| 7/8 | 0.8750 | 22.23 | Eighth |
| 15/16 | 0.9375 | 23.81 | Sixteenth |
| 1 in | 1.0000 | 25.40 | Inch line |
How this is worked out
A sixteenth is 0.0625 of an inch, so every row is a whole number of those. The decimals come out exact at four places and need no rounding.
An inch is exactly 25.4 millimeters. That's the definition, so the metric column only rounds at the last step, to two places.
On a tape, the longest line between two inch marks is the half. The quarters are a little shorter, then the eighths, and the shortest lines are the sixteenths. To read a length, count from the inch line below it. The last column says which line you're counting to.
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