![]() The following table shows the conversion factors for the most common units of length. Some modern tools such as lasers, GPS, or lidar based imaging devices allow measuring without comparing a tool to a real-world measurement. Most tools offer a way to compare a scale on the tool to the real-world measurement to let you gauge the length. Rulers and tape measures are the most common measuring tools, but there are many ways to measure length, including without a tool. ![]() To correctly measure length you'll need a measuring device of some kind. The units most commonly used in the US customary system are the inch, foot, yard, and mile, but other units such as the furlong, rod, chain, league, survey foot, and survey mile are used for surveying. Today, US customary units are defined in terms of the SI metric units of length, which was formalized in 1958 in a conference of English-speaking nations. US customary units were derived from the old British imperial units before the United States became an independent country. The US customary system is mostly used in the United States, but it's also used in a few other countries as well. The most commonly used units of length are the meter, kilometer, decimeter, centimeter, millimeter, micrometer, and nanometer. The SI metric system defines a list of prefixes to define other units of length in terms of the meter.įor instance, the centimeter uses the prefix "centi," which indicates that the unit is equal to 1/100 of a meter. The SI metric system is the most commonly used measurement system around the world, and it defines the meter (or metre) as the base unit of length. There are various measurement systems used to measure length the most widely used today are the SI metric system and the US customary system. We have some similar measurement resources that you might also find interesting, such as our inch fraction calculator, printable tape measure, or our printable rulers. The length converter above along with our other unit conversion tools will help you easily convert a length measurement from one unit to another automatically. Learn more using our inches to cm conversion calculator. Thus, 18 inches is equal to 45.75 centimeters. Step Two: convert 0.4572 meters to centimeters. A measurement of distance between two places is defined as length. For example, let's convert 18 inches to centimeters. Use the calculator to convert length units for centimeter, inch, league, yard, point, etc.
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