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Rulers are an essential tool to have, but if you’re struggling with how to read a ruler, you're not alone. There are so many lines on a ruler, it can get confusing to figure out what they all mean. While we will be providing pictures you can use to follow our instructions, we recommend getting out your own ruler or measuring tape so you can follow along in real time. The 1/2-inch line is located midway between every inch on a ruler. The midpoint between 7 and 8 inches, for instance, would be 7 1/2 (or 7.5) inches. 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.
Example: If you were to measure the length of a sheet of computer paper, the piece of paper would come up to the 11-inch mark on your ruler, indicating that it's exactly 11 inches long. Each inch is divided into 16 lines, meaning that the space between each line is 1/16 inch long —this is the smallest length you can measure with a ruler. (Note that some rulers only go down to 1/8 inch lines, whereas others go down to 1/32 inch lines.) 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’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. Got questions about decimals and fractions?Our expert guides will teach you how to convert decimals to fractions and how to add and subtract fractions.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. The longest line represents the biggest unit on the ruler: 1 cm. Each centimeter is labeled on the ruler (1-30).
Finally, the smallest unit on a ruler is 1/16 inch.These tiny lines that represent 1/16 inch come between all 1/8-inch lines: 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. You’re measuring a pair of glasses, from the end of one lens to the far end of the other lens. Your ruler reaches the seventh line past 12 cm. How long is the pair of glasses? Next is 1/8 inch, which is the second-smallest unit of a ruler. The 1/8 lines are found midway between each 1/4-inch line: 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!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. 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.
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. If you want any extra assistance with learning how to read a ruler in cm or inches, videos and worksheets can be excellent resources. The standard metric ruler is 30 cm long. Each centimeter is labeled with a number to show the measurement it's referring to. You might see inches on the other side of your metric ruler. In this case, refer to the instructions above to learn how to read a ruler in inches.Also, be aware that 30 cm does not directly equal 12 inches, even though they are often put on the same ruler! 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.
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