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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: 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. 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 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. 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 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?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. Let’s start by looking at how to read a ruler in inches. If you’re American, this is the measurement you probably know better than centimeters, which are sometimes included on your standard 12-inch, or 1-foot, ruler (we’ll go over how to read a ruler in cm in the next section). This is especially important to know if you’re studying science (recall that science generally uses the metric system —not the imperial system). Knowing how to read a ruler in cm is also helpful for people who'd prefer to not work with fractions (which you must do with inches) and who'd like to work with other units instead (in this case, millimeters). Also, be aware that 30 cm does not directly equal 12 inches, even though they are often put on the same ruler!
The third-biggest lines on a ruler are the 1/4 inch lines, which appear midway between the 1/2 inch and whole inch lines: 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. There are two types of rulers you can use: the inch, or imperial, ruler and the centimeter, or metric, ruler. There have been huge advances in technology over the past decade, allowing for increasingly powerful assistive software to be created to help people overcome literacy difficulties. Sometimes however, the most effective tool that can be used is not complicated software, but instead something much simpler.Inches correspond to the imperial system, which is the main measuring system used in the US and a smattering of other countries. 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? You can tell that this is a metric ruler because it’s divided into 30 equally spaced sections and has "cm" written on it(ignore the inches below). There will always be 10 lines from one centimeter to the next centimeter. In total, there are three different lengths of lines on a metric ruler. 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.)
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