What is a Ruler

A ruler is a device with measurement markings top top it offered for measuring illustration straight lines. Students, engineers, contractors, and also makers usage rulers for math, construction, architecture, sewing, landscaping, and also more.

You are watching: Eighth of an inch on a ruler

According come Dictionary.com, a leader is a strip of wood, metal, or other material having actually a straight edge and also usually marked off in customs or centimeters, supplied for drawing lines, measuring, etc.<1>

Several species of rulers encompass wooden or metal rulers, yardsticks, seamstress tapes, ice cream measures, carpenters rules, and also architects scales.

Rulers have measurements in imperial and metric, imperial-only, or metric-only. Get an ext information top top rulers, consisting of different species and uses, or download and print among our free printable rulers.

How to use a ruler – Standard imperial Measurements


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The markings ~ above a conventional ruler stand for the fountain of an inch. The markings ~ above a leader from the begin to the 1″ note are: 1⁄16“, 1⁄8“, 3⁄16“, 1⁄4“, 5⁄16“, 3⁄8“, 7⁄16“, 1⁄2“, 9⁄16“, 5⁄8“, 11⁄16“, 3⁄4“, 13⁄16“, 7⁄8“, 15⁄16“, and 1”. If the measurement is over 1″, simply use the number on the ruler and add the fraction. Because that instance, if you’re two ticks previous the number 3 tick, then the measure is 3 1⁄8“.


Reading a ruler starts with knowledge what every the ticks mean. The biggest ticks on a ruler stand for a complete inch, and also the distance between each big tick is 1″.
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The big ticks in in between the customs markings are half-inch markings, and also the distance in between an customs tick and a half-inch tick is 1⁄2“.
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The mid-sized ticks between the customs ticks and half-inch ticks space the quarter-inch ticks. The distance in between a quarter-inch tick and an inch mite or a half-inch tick is 1⁄4“.
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The smaller ticks room the eighth-inch ticks and may be the the smallest or 2nd smallest markings on the ruler. The distance between an eighth-inch tick and the other larger ticks is 1⁄8“.
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The the smallest ticks ~ above a ruler are the sixteenth-inch ticks. The distance between a sixteenth-inch tick and the other larger ticks is 1⁄16“.
Metric rulers have centimeter and millimeter markings. The larger markings these stand for a centimeter.
The smaller sized ticks on a metric ruler stand for a millimeter. There room 10 millimeters in a centimeter, so there space 9 millimeter ticks in between each centimeter tick.

Ruler Measurements: customs Fractions ~ above a Ruler

These room the measurements and fractions that room on a ruler and the decimal and millimeter metric equivalents. If you need to convert larger customs fractions come decimal or metric, usage our inch portion calculator.

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Fraction, Decimal, and Millimeter tantamount Measurements

Ruler portion measurements converted to equivalent decimal and millimeter metric values.FractionDecimalMillimeters
1⁄16“0.06251.5875
1⁄8“0.1253.175
3⁄16“0.18754.7625
1⁄4“0.256.35
5⁄16“0.31257.9375
3⁄8“0.3759.525
7⁄16“0.437511.1125
1⁄2“0.512.7
9⁄16“0.562514.2875
5⁄8“0.62515.875
11⁄16“0.687517.4625
3⁄4“0.7519.05
13⁄16“0.812520.6375
7⁄8“0.87522.225
15⁄16“0.937523.8125
1″125.4