![]() 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. Centimeterĭefinition: A centimeter (symbol: cm) is a unit of length in the International System of Units (SI), the current form of the metric system. It is also sometimes used in Japan (as well as other countries) in relation to electronic parts, like the size of display screens. 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. Write the conversion as a fraction (that equals one) Multiply it out (leaving all units in the answer) Cancel any units that are both top and bottom. 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. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types.Definition: An inch (symbol: in) is a unit of length in the imperial and US customary systems of measurement. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Most users prefer to convert units using the most common definition, so this site uses the non-SI form.Ĭ provides an online conversion calculator for all types of measurement units. This means that a 500 GB hard disk drive would appear as "465 GB". The difference between units based on SI and binary prefixes increases exponentially - in other words, an SI kilobyte is nearly 98% as much as a kibibyte, but a megabyte is under 96% as much as a mebibyte, and a gigabyte is just over 93% as much as a gibibyte. ![]() ![]() ![]() Since 1999, the IEC recommends that this unit should instead be called a "gibibyte" (abbreviated GiB). SI Prefix symbols are featured in the chart and used to represent smaller or larger units by factors that are powers of 10. Microsoft uses this definition to display hard drive sizes, as do most other operating systems and programs by default. NIST SI Measurement System Chart (2021) is a colorful chart explaining the 7 base units of the SI, prefix symbols, and features the Measurement League: Guardians of the SI. This is the definition commonly used for computer memory and file sizes. However, most people have requested the more common usage, so the non-SI version is used on this site.Ī gigabyte is a unit of information or computer storage meaning approximately 1.07 billion bytes. The official SI definition uses the "mebibyte" or MiB unit to represent 2 20 bytes. GB to MB, or enter any two units below: Enter two units to convert From:Ī megabyte is a unit of information or computer storage equal to 1,048,576 bytes. You can do the reverse unit conversion from
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