A centimetre is approximately the width of the fingernail of an adult person.Ĭonversion calculator for all types of measurement units. However, it is practical unit of length for many everyday measurements. The centimetre is a now a non-standard factor, in that factors of 10 3 are often preferred. A corresponding unit of volume is the cubic centimetre. A corresponding unit of area is the square centimetre. It is the base unit in the centimetre-gram-second system of units. The international inch is defined to be equal to 25.4 millimeters.Ī centimetre (American spelling centimeter, symbol cm) is a unit of length that is equal to one hundreth of a metre, the current SI base unit of length. The inch is still commonly used informally, although somewhat less, in other Commonwealth nations such as Australia an example being the long standing tradition of measuring the height of newborn children in inches rather than centimetres. The inch is usually the universal unit of measurement in the United States, and is widely used in the United Kingdom, and Canada, despite the introduction of metric to the latter two in the 1960s and 1970s, respectively. There are 36 inches in a yard and 12 inches in a foot. It is also sometimes used in Japan (as well as other countries) in relation to electronic parts, like the size of display screens.Ĭentimeter to Inch Conversion Table Centimeter ġ5 cm = 15 × 0.3937007874 in = 5.You can do the reverse unit conversion fromĬm to inches, or enter any two units below: Enter two units to convert From:Īn inch is the name of a unit of length in a number of different systems, including Imperial units, and United States customary units. Another version of the inch is also believed to have been derived from the width of a human thumb, where the length was obtained from averaging the width of three thumbs: a small, a medium, and a large one.Ĭurrent use: The inch is mostly used in the United States, Canada, and the United Kingdom. One of the earliest definitions of the inch was based on barleycorns, where an inch was equal to the length of three grains of dry, round barley placed end-to-end. There have been a number of different standards for the inch in the past, with the current definition being based on the international yard. History/origin: The term "inch" was derived from the Latin unit "uncia" which equated to "one-twelfth" of a Roman foot. There are 12 inches in a foot and 36 inches in a yard. An inch was defined to be equivalent to exactly 25.4 millimeters in 1959. Inchĭefinition: An inch (symbol: in) is a unit of length in the imperial and US customary systems of measurement. Height is commonly measured in centimeters outside of countries like the United States. Learning some of the more commonly used metric prefixes, such as kilo-, mega-, giga-, tera-, centi-, milli-, micro-, and nano-, can be helpful for quickly navigating metric units.Ĭurrent use: The centimeter, like the meter, is used in all sorts of applications worldwide (in countries that have undergone metrication) in instances where a smaller denomination of the meter is required. Metric prefixes range from factors of 10 -18 to 10 18 based on a decimal system, with the base (in this case the meter) having no prefix and having a factor of 1. History/origin: A centimeter is based on the SI unit meter, and as the prefix "centi" indicates, is equal to one hundredth of a meter. Definition: A centimeter (symbol: cm) is a unit of length in the International System of Units (SI), the current form of the metric system.
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