Length Converter Calculator Free Download

Use this Conversion Calculator to convert between commonly used units. Select the current unit in the left column, the desired unit in the right column, and enter a value in the left column to generate the resulting conversion. A full list of unit conversions is available at unitconverters.net.

Historically, many different systems of units have been used, where a system of units is defined as a collection of units of measurement with rules that relate them to each other. A unit of measurement is a defined magnitude of a quantity that it used as a standard for measurement for the same kind of quantity, such as measurements of length, weight, and volume.

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In the past, many systems of measurement were defined on a local level, and could be based on factors as arbitrary as the length of a king's thumb. While this may work on a local level, when considering trade, as well as science, having systems of units based on units that others may not be able to relate to or understand makes interaction difficult. As such, the development of more universal and consistent systems developed over time. Today, some of the systems of units in use include the metric system, the imperial system, and the United States customary units.

The International System of Units (SI) is the standard metric system that is currently used, and consists of seven SI base units of length, mass, time, temperature, electric current, luminous intensity, and amount of substance. Although SI is used almost universally in science (including in the US), some countries such as the United States still use their own system of units. This is partly due to the substantial financial and cultural costs involved in changing a measurement system compared to the potential benefit of using a standardized system. Since US customary units (USC) are so entrenched in the United States, and SI is already used in most applications where standardization is important, everyday use of USC is still prevalent in the United States, and is unlikely to change. As such, many unit converters including this Conversion Calculator exist, and will continue to do so to ensure that people globally are able to communicate different measurements effectively.

In 1668, John Wilkins proposed a decimal system in which length, area, volume, and mass were linked to each other based on a pendulum that had a beat of one second as a base unit of length. In 1670, Gabriel Mouton proposed a decimal system that was instead based on the circumference of the earth, an idea supported by other prominent scientists of the time such as Jean Picard and Christiaan Huygens, but that did not take hold for approximately another 100 years.

By the mid-eighteenth century, it was clear to nations who traded and exchanged scientific ideas that standardization of weights and measures was necessary. In 1790, Charles Maurice de Talleyrand-Perigord, the Prince of Talleyrand, approached the British (represented by John Riggs-Miller) and the Americans (represented by Thomas Jefferson) with proposals to define a common standard of length based on the length of a pendulum. In that same year, Thomas Jefferson, presented the "Plan for Establishing Uniformity in the Coinage, Weights, and Measures of the United States," which advocated for a decimal system in which units were related to each other by powers of ten. A committee that was formed in France comprised of some of the most prominent scientists of the day came to a similar conclusion, and also proposed a decimal system for all weights and measures. Although Congress considered Jefferson's report, it was not adopted. In Great Britain, John Riggs-Miller lost his British Parliamentary seat in the 1790 election. As such, the measurement system was only implemented in France, and in 1795, the metric system was formally defined in French law. It was not until 1799, however, that the metric system was officially adopted in France, though it was still not universally observed across the country.

This length conversion calculator works by typing units (up to 11 in the same calculation) into the tool. The length converter then returns your results in each unit in real time. Click on the unit name if you want to perform length conversion to a different unit than the default ones chosen by the Omni team.

Once you've mastered lengths and their conversion, you can apply that knowledge to circles in our circle length calculator. If you are looking to convert between units of area, another tool we would recommend is the square footage calculator.

The inch (abbreviate as in or ") is a unit of length in Imperial / the US metric system. The measure comes from - by some definitions - the width of a human thumb. In some languages, e.g. Norwegian, Afrikaans, Italian or French, an inch is derived from the word for thumb or, in some cases, it's the same word. In the 14th century, the inch was defined by the king of England as three grains of barley, dry and round, placed end to end, lengthwise.

Inch definition varied through the ages but during the 1950's an international standard was accepted, and since then the inch is equal to exactly 2.54 centimeters.

On a daily basis, inches are used in US, UK, Canada and other countries which were formerly part of the British Empire. Height, length, width may be measured in inches, also many sizes are expressed in units derived from inches (e.g. shoe size).

The foot (abbreviate as ft or ') is a unit of length in an Imperial / US metric system. It's a measurement based on the human body as well, as the name indicates. The unit was standardized in the 1950s, and since then it's equal to 0.3048 meters exactly:

1799 - 1889, brass, platinum, and the alloy of platinum with 10% iridium meter bars were constructed, still as a basis having Earth's meridian length. The 1st General Conference on Weights and Measures in 1889 defined the meter as the distance between two lines on a standard bar of the latter type of alloy. This International Prototype Meter is still kept in the International Bureau of Weights and Measures in Svres, near Paris. That meter definition was in force till 1960 and the 11th General Conference on Weights and Measures.

Imperial and US measurement system are not the same thing, but for length measures they are the same (they are non-identical in volume measures, so e.g. the cup can contain different amount of fl oz from both systems). The only countries which didn't accept the metric units are US, Liberia and Myanmar.

There are two other length units, but we excluded them from this length converter on purpose: a furlong's conversion ratio is not uniformly defined, and a league used to be a popular measure in Europe and Latin America but is no longer an official unit anywhere. However, you can find them below, with the most often used values:

Metric measurements of length are widely used around the world due to their simplicity and consistency. The base unit of length in the metric system is the meter (m), which is defined as the distance traveled by light in a vacuum in 1/299,792,458 second. This fundamental unit can be easily converted into smaller or larger units by using prefixes.

For smaller measurements, the most commonly used metric units are the centimeter (cm) and the millimeter (mm). A centimeter is equal to one-hundredth of a meter, while a millimeter is one-thousandth of a meter. These units are often used for precise measurements, such as the length of objects or the thickness of materials.

Larger measurements of length are expressed in kilometers (km) or meters (m). A kilometer is equal to one thousand meters, making it suitable for measuring longer distances, such as the length of roads or the size of countries. Meters are commonly used for everyday measurements, such as the height of a person or the width of a room.

The metric system's decimal-based nature makes it easy to convert between different units of length by simply moving the decimal point. This simplicity, along with its widespread adoption, has made the metric system the preferred choice for scientific, industrial, and everyday measurements across the globe.

Imperial or American measurements of length are commonly used in the United States and a few other countries that have not adopted the metric system. These measurements are based on historical units that were used in the British Empire and have since been standardized.

The most commonly used unit of length in the Imperial system is the inch, which is equivalent to 2.54 centimeters. Twelve inches make up a foot, and three feet make up a yard. The yard is often used for measuring longer distances, such as in construction or landscaping.

Meters, as a unit of measurement, are widely recognized and used for measuring length in the metric system. The meter is defined as the distance traveled by light in a vacuum in 0.000000003335641 seconds. This definition provides a precise and consistent standard for measuring length, making the meter a fundamental unit in the International System of Units (SI).

The meter is commonly used in various fields, including science, engineering, and everyday life. It provides a convenient and easily understandable way to quantify distances, whether it's measuring the length of a room, the height of a building, or the distance between two cities. The use of meters allows for accurate and standardized measurements across different countries and disciplines, promoting consistency and facilitating international communication and trade.

The meter is part of a decimal-based system, making it easy to convert between different units of length within the metric system. For example, there are 1,000 millimeters in a meter, and 100 centimeters in a meter. This simplicity and flexibility make the meter a versatile unit of measurement, suitable for a wide range of applications. Whether it's measuring small objects or vast distances, the meter provides a reliable and universally accepted standard for length measurement. 2351a5e196