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If you counted in 1/4 inches on a ruler, you'd see that the fourth line after 0 inches equals 1/4 inch, the eighth line equals 2/4 (1/2) inch, and the 12th line equals 3/4 inch. If you counted in 1/8-inch increments, you'd find that the second line after 0 equals 1/8 inch, the fourth line 2/8 (1/4) inch, the sixth line 3/8 inch, the eighth line 4/8 (2/4 or 1/2) inch, the 10th line 5/8 inch, the 12th line 6/8 (3/4) inch, and the 14th line 7/8 inch. The truth is that there are tons of moments in life when you’ll need to know how to read a ruler. And if you don’t know how to read a ruler, then you’ll likely suffer some consequences. For instance, what if you make two pieces of something that don’t fit together because one is shorter or longer than it was supposed to be? Or what if you mess up a science experiment because you didn’t accurately read the measurement of a piece of string you cut? Also, be aware that 30 cm does not directly equal 12 inches, even though they are often put on the same ruler! The second-biggest unit on a ruler is the 1/2 inch, which is represented by the second-longest line. These typically aren't labeled but might be on some rulers (in which case you'd see numbers such as 1 1/2 in, 2 1/2 in, etc.).
In this guide, we’ll explain why you should know how to read a ruler and give you step-by-step instructions on how to read a ruler in inches and cm. We’ll also provide you with some helpful resources you can use to keep honing your ruler-reading skills. The longest line represents the biggest unit on the ruler: 1 cm. Each centimeter is labeled on the ruler (1-30). Example: Say you decide to measure the length of a corn on the cob. You find that your ruler comes to the second line after the 6-inch mark. This would mean that the corn is 6 1/8 inches long.Now, notice the lines between each inch, with some longer and some shorter than others. Each of these tiny lines represents a fraction of an inch. There are five different lengths of lines in total.
Metric rulers usually have only centimeters and millimeters on them. But did you know there's an even tinier unit called nanometers? Learn how to convert nanometers to metersand other measurements with our in-depth guide. The smallest unit a metric ruler can measure is 1 mm, or 0.1 cm. These are the smallest lines on the ruler, that is, the ones that come between the whole centimeter and 1/2 centimeters:
How to Read a Ruler in Inches
Right away, you should be able to tell that this ruler uses inches, as it’s divided into 12 equally spaced areas (labeled 1-12), and we know there are 12 inches in a foot (ignore the cm below). Example: You’re trying to measure the length of your pointer finger. The ruler comes to the seventh line past 3 inches. This would mean that your finger is 3 7/16 inches long. Example: If you were to measure the width (instead of length) of a piece of computer paper, the piece should come up exactly to the 1/2 inch line between 8 and 9 inches, indicating that the width is 8 1/2 (8.5) inches. The Eye Level Reading Ruler is a coloured overlay filter and text highlighter about the size of an eight-inch ruler. It is discreet and professional-looking and can be kept in a book as a bookmark for easy storage. This Dyslexia Friendly resource helps relieve the symptoms of Visual Stress. For example, if you wanted to make something out of construction paper, you'd likely need to use a ruler to measure out how much of the material you would need. Or what if you wanted to frame a photo you have? In this case, you might have to measure the picture to see what kind of frame it would fit in.
These reading rulers are made of transparent plastic that both underlines the text by the use of an opaque line and highlights it in a coloured tint. One side of the ruler is gloss and the other matt. Example: You take out a ruler to measure the width of your fingernail. The ruler stops at 1 cm, meaning that your nail is precisely 1 cm wide. Example: Say you're measuring the width of your smartphone, and it comes up to the fifth line after 4 cm on your ruler. This would mean that the phone is 4.5 cm (45 mm) wide.
All of these resources, in addition to the handful of practice questions we gave you above, should be enough to get you reading a ruler in no time at all! A sufficiently wide range of colors to meet the needs of all children who will benefit from using a colored overlay product
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