Length Unit Converter.

*To convert multiple values, separate them using spaces.

Text Topics

1 - Length Units Converter.2 - Meter (m).3 - Millimeter (mm), Centimeter (cm), and Decimeter (dm).4 - Decameter (dam), Hectometer (hm), and Kilometer (km).5 - Inch (in).6 - Feet (ft).7 - Yard (yd).8 - Mile (mi).9 - Land League.10 - Imperial or Ocean Fathom Brace (FTM).11 - Nautical (or international sea) mile.12 - Lunar Distance (LD).13 - Astronomical Unit (AU).14 - Light year (LY).15 - Parsec (pc).16 - Chain, Rod, and Brace (Portuguese).

Easily convert multiple values and automate your work with our tool.

Length Units Converter.

Automate your work using our completely free online tool to convert between various length units. It includes the main methods of measuring distances used in our society, and we intend to add others. In our app, you can easily:
 • Convert multiple values at once, simultaneously;
 • Select what will be the decimal separator;
 • Choose the number of decimals you want;
 • Select the values separator converted;
 • You can quickly switch units;
 • And quickly copy the result.
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Meter (m).

It was developed by a commission of 5 mathematicians - around the year 1790 in France. Thought to be an international unit of measurement, to improve communication between nations, because, at the time, different units of measurement were used, which caused confusion. It underwent two reformulations, one in 1875 - to correct a calculation error and the other is 1983, which started to base it on the speed of propagation of light in a vacuum. It is used as the official unit of measurement by the International System of Units (SI). Furthermore, it has several multiples: kilometer (km), hectometer etc. In addition, submultiples: centimeters (cm), millimeters (mm) and so on.

Millimeter (mm), Centimeter (cm), and Decimeter (dm).

They are submultiples of a meter, equivalent to a thousandth, a hundredth, and a tenth of a meter, respectively.

Decameter (dam), Hectometer (hm), and Kilometer (km).

They are multiples of the meter, equivalent to 10, 100, and 1000 meters, respectively.

Inch (in).

It was created by King Edward I of England in the mid-16th century, consisting of the width of the thumb of the hand, measured at the base of the nail, which is equivalent to 2.54 cm. However, before the English, the Romans also used this technique to measure. It is widely used in the USA, UK, Canada, and other countries and is the standard measurement used to measure the size of screens on electronic devices.

Feet (ft).

The foot has been used as a unit of length since Ancient Greece and is widespread in the UK, USA, Canada, and other English-speaking countries. Currently, one foot is equivalent to 30.48 cm - this value may have been based on the foot of King Henry I of England, but it was probably derived from inches. It has the symbol ft (feet) or an apostrophe (').

Yard (yd).

It is the base length of the measures used in the USA and in the UK, having been created by King Henry I of England, in the 12th century, as the measure between the tip of his nose and his thumb, with the arm extended. Until 1959 its value was equivalent to 91.43975 cm, from that year on the value was unified and became accepted as 91.44 cm, in the International System of Measures (SI), the value is converted to meters, being 0.9144 m.

Mile (mi).

The first reports of its use date back to Ancient Rome, where a mile was 1000 steps taken by a centurion - in Latin mille passus. Throughout its, history it was represented by several values until it was standardized in 1959 as 1,609.344 meters.

Land League.

It was based on the distance a person can cover in one hour of walking, since the Middle Ages it has been given various values, and even today there is no standard, so it is usually given a different value in each country.

Imperial or Ocean Fathom Brace (FTM).

It is an unofficial unit of the International System but widely used in various parts of the world to measure sea depths. It originated in the British Empire, as the distance between the tips of the middle fingers of a man's hands, with his arms extended (open horizontally). During its history, it has had several values, but in 1959 it was standardized at 1.8288 m.

Nautical (or international sea) mile.

It was initially defined as a value corresponding to one minute of a meridian arc (north-south). In 1929, aiming for a clearer definition, it was defined in 1852 meters, a value obtained from the distance of each minute of latitude or longitude from the earth, some calculations validate this statement, but they will not be explained here. Since then, it has been called an international nautical mile, which means that it has the same value anywhere on the planet. Its main advantage is that it can be measured from maps and nautical charts.

Lunar Distance (LD).

This is the average distance between the Earth and the Moon, equivalent to 384398 km. Thanks to the mirrors installed during the Apollo 11, 12, and 15 missions, this value can be measured extremely accurately using a laser. To perform the calculation, first, a laser beam is emitted into one of the mirrors present on the surface, then the time it takes for the light to return to the starting point is counted.

Astronomical Unit (AU).

This is a unit commonly used in measuring distances within a solar system, for example in measurements within our solar system. It has been defined as the average distance between the Sun and Earth, so the Earth is exactly one AU away from its star or 499 light seconds. In 2012, a revision of this unit occurred, in which it became worth exactly 149,597,870,700 meters.

Light year (LY).

It is the interval traveled by light in a vacuum in one year; a very common misconception is to confuse it with a unit of time measurement. It is used, mainly, to determine astronomical longitudes, either between celestial bodies or other objects. Equivalent to 9.461×10¹⁵ meters, its use is quite popular, but in the professional astronomical environment, it is more common to use the parsec.

Parsec (pc).

This is the unit for measuring the great distances between astronomical objects within the Milky Way, most commonly used by astronomers in scientific work. Equivalent to 3.26 light-years, it has some multiples that are used for larger distances - especially - those outside our galaxies, such as megaparsecs (MPC) and gigaparsecs (GPC). The calculation of a parsec can be done from relatively easy observational data and by the use of parallax and trigonometry.

Chain, Rod, and Brace (Portuguese).

The chain is a widely used unit for measuring land, equivalent to approximately 20.1168 meters. The rod is both an English (5.0292 meters) and Portuguese (2.96 meters) measure, it originated during the Roman Empire. A Portuguese fathom is a unit widely used in rural areas of Portuguese-speaking countries, comprising 2.20 meters.

Author: OnliTools



1 - SI Units – Length2 - Units for Measuring Length3 - Metric units of length review (mm, cm, m, & km)4 - Units of Length5 - Physical Quantities and Their Units6 - Imperial Measures of Length
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