# How do I calculate the time with length

## Convert lengths

### Operating assistance

Enter the length to be converted and select from and to which unit of length this value is to be converted. The converter for lengths provides the common metric, the most common Anglo-American as well as nautical and astronomical length measures for the calculation. Further information on the various units of length can be found behind the help buttons on the calculator with question marks.

### Metric units of length

The metric system is the system of units with the meter as the base unit for the length of a distance. In contrast to other systems of units, it is easy to calculate with decimal multiples or decimal fractions. This includes the following units of length:

### Kilometers (km)

The unit kilometer belongs to the metric system and is derived from the base unit meter. 1 kilometer can be converted to 1,000 meters, or 1 meter is equivalent to 0.001 kilometers. The kilometer belongs to the international system of units (SI).

### Meter (m)

The meter is the base unit for length in the International System of Units (SI) and in other metric systems. Since 1983 it has been defined as the distance that light travels in 1 / 299.792.458 of a second in a vacuum. All other units of length in the metric system are derived from the meter (e.g. 1 km = 1,000 m, 1 m = 1,000 mm).

### Decimeter (dm)

The unit decimeter is derived from the base unit meter. 1 decimeter can be converted to 0.1 meters or 1 meter corresponds to 10 decimeters. The decimeter belongs to the international system of units (SI).

### Centimeter (cm)

The unit centimeter is also derived from the basic unit meter. 1 centimeter can be converted to 0.01 meters or 1 meter corresponds to 100 centimeters. Like the meter, the centimeter also belongs to the international system of units (SI).

### Millimeter (mm)

The unit millimeter is of course also derived from the base unit meter. 1 millimeter can be converted to 0.001 meters or 1 meter corresponds to 1000 millimeters. Again, the centimeter belongs to the international system of units (SI).

### Micrometer (μm)

The micrometer is also derived from the basic unit, the meter. 1 micrometer can be converted to 0.000001 meters or 1 meter corresponds to 1,000,000 micrometers.

### Nanometer (nm)

Last but not least, the nanometer is also derived from the base unit, the meter. 1 nanometer can be converted to 0.000000001 meters or 1 meter corresponds to 1,000,000,000 nanometers.

### Ångstrom (Å)

The unit Ångstrom belongs to the metric system and is derived from the base unit meter. 1 Ångstrom can be converted to 0.00000001 meters or 1 meter corresponds to the equivalent of 10,000,000,000 Ångstrom. This unit does not belong to the international system of units (SI), but is used for practical reasons, e.g. in chemistry or crystallography. For example, an Å is the typical order of magnitude of atomic radii.

### Other metric units

There are numerous other SI units of length that ultimately represent a multiple or a fraction of the meter. For this purpose, so-called unit prefixes, i.e. prefixes for the meter, are created as in the previous examples. The following table gives an overview:

symbol | Surname | value | |
---|---|---|---|

Ym | Yottameter | 10^{24} | Quadrillion meters |

Zm | Zettameter | 10^{21} | Trillion meters |

Em | Exameter | 10^{18} | Trillion meters |

Pm | Petameter | 10^{15} | Billiard meters |

Tm | Terameter | 10^{12} | Trillion meters |

Gm | Gigameter | 10^{9} | Billion meters |

Mm | Megameter | 10^{6} | Million meters |

km | kilometre | 10^{3} | A thousand meters |

Hm | Hectometer | 10^{2} | A hundred meters |

dam | Decameter | 10^{1} | Ten meters |

- | meter | 10^{0} | One meter |

dm | decimeter | 10^{-1} | Tenths of a meter |

cm | centimeter | 10^{-2} | Hundredths of a meter |

mm | millimeter | 10^{-3} | Thousands of a meter |

µm | Micrometer | 10^{-6} | Millionth of a meter |

nm | Nanometer | 10^{-9} | Billionths of a meter |

pm | Picometer | 10^{-12} | Trillionth of a meter |

fm | Femtometer | 10^{-15} | Billiardths of a meter |

at the | Attometer | 10^{-18} | Trillionth of a meter |

zm | Zeptometer | 10^{-21} | Trillionths of a meter |

ym | Yoctometer | 10^{-24} | Quadrillionth of a meter |

### Popular converters from practice

### Anglo-American units of length

The Anglo-American units of length originally come from medieval England. Many of them were sizes that can be measured with one's own body, such as the foot, hand, and cubit. In the course of time they were to a large extent unified and eventually the metric system was used as the standard for most Anglo-American units of length. However, they do not belong to the international system of units and are therefore not SI-compliant.

### Mile (mi)

Historically, the term mile originated in the Roman Empire as a sequence of 1,000 double steps, i.e. mille passus (thousand steps). A distinction is now made between the land mile described here and the nautical mile known from nautical science. 1 mile can be converted to 1.609344 kilometers or 1 kilometer is equivalent to 0.62137 miles.

### Yard / step (yd)

The yard or step length measure is officially approved in the Anglo-American countries and is used to describe average lengths. In the course of time there were various definitions in which the yard was defined, for example, as the length of three feet or as the distance from the tip of the nose to the tip of the thumb of the outstretched arm of Henry the First. In the meantime, the yard or step has been defined as follows since 1956: 1yard is converted to 3feet, which in turn corresponds to converted 0.9144 meters.

### Foot / foot (ft)

The foot was widely used as a measure of length very early and is still used today in Anglo-American countries. In the individual countries it usually corresponded to a length of 28-32cm. In the meantime only the English foot is used. 1 foot can be converted to 30.48 centimeters or 1 foot corresponds to the converted 12 inches / inch.

### Inch (in)

Historically, the inch was initially legally stipulated as 1/12 of a foot, and later also as the length of three barley grains strung together. Like foot, step (yard) and mile, it is one of the units of length that do not belong to the international system of units, but are widely used and officially approved in the Anglo-American region. In today's version, the inch is again set at 1/12 of a foot. This means that 1 inch can be converted to 2.54 centimeters or 1 centimeter is equivalent to 0.3937 inches.

### Other Anglo-American units of length

In 1959, after the standardization of the length measurements to the metric system, some length units were retained in order not to have to change the existing land and property measurements. These units of length have only been retained for this purpose and are called US survey measures of length. These include, for example, the link (chain link) with the equivalent of 0.2011684 m, another measure for the foot with 0.3048006 m, the chain (chain) with 20.11684 m or the furlong (furrow) with the equivalent of around 201.1684 m.

### Nautical units of length

Several units of measurement have traditionally become established in the maritime and aviation sectors. These include:

### Nautical mile (sm)

The nautical mile or nautical mile is an often used unit of measurement for length in shipping and aviation. Originally it was supposed to be 1/60 of a degree of latitude. The nautical mile was later precisely defined at 1,852.0 m.

### Fathom / thread (fth)

The fathom or thread traditionally describes the span between the outstretched arms of an adult male and was defined as 6 feet. (1.8288 meters). 1 Fathom is the equivalent of 1.8288 meters. In English-speaking shipping, this unit of length is often used to indicate depth.

### Astronomical units of length

These units of length are used to cope with the other proportions in astronomy. Although they do not belong to the international system of units, they are indispensable for the description of distances in astronomy.

### Light year (Lj)

A light year describes the distance that light (in a vacuum) travels within a year. Since there are different definitions for a year (Gregorian year, tropical year, Julian year etc.), the Julian year (365.25 days) was chosen as the basis for the definition of the light year. A light year is therefore the equivalent of 9,460,730,472,580.8 km, i.e. around 9.5 trillion km. For example, the extent of the Milky Way is 100,000 light years.

### Light minute (Lm)

A minute of light describes the distance that light (in a vacuum) travels within one minute. One light minute is the equivalent of 17,987,547.48 km, i.e. around 18,000,000 km. For example, the sun is on average about 8.3 light minutes away from the earth.

### Light second (Ls)

A light second describes the distance that light (in a vacuum) travels within one second. One light second corresponds to the equivalent of 299,792.458 km, i.e. around 300,000 km. For example, the mean distance between the earth and the moon is approximately 1.3 light seconds.

### Parsec (pc)

The parsec is an astronomical unit of length and corresponds to around 3.26 light years. It is very helpful when determining the distances between different stars, since the different angles between the stars are decisive. Viewed from Earth, a star seems to move back and forth a little over the course of the year. This is because the earth moves around the sun and lies relatively far "left" and once relatively far "right" of the sun in an interval of 6 months. The end points of this apparent star movement span an angle when viewed from the earth. The further away the star is, the smaller this angle becomes. Since the mean distance between the earth and the sun is known, trigonometric functions show that an imaginary celestial body that moves back and forth by 3600ths of a degree is around 3.26 light years away from earth. This distance is defined as a parsec.

The back and forth movement is called the parallax movement. A 3600th of a degree is called an arcsecond. The term parsec is made up of these two terms. Thanks to this definition, astronomical distances can be described very easily, as they result directly from the reciprocal of the parallax angle. For example, if the angle is one arc second, the distance is 1pc; if the angle is 0.5 arc seconds, the object is 2pc away.

### Astronomical Unit (AU)

The astronomical unit (AU) is a measure of length in astronomy. By definition, the AE has a length of 149,597,870,700 meters, which is almost the mean distance between the earth and the sun. In addition to the light year and the parsec, the astronomical unit is one of the most important astronomical units of measurement. Historically, the AE was of great importance, since most measurement methods provided AE and not meters as a result. Since the conversion between astronomical units and meters is now precisely known and was precisely defined in 2012, the AE no longer offers any further advantages. However, due to the more manageable values, distances in the solar system are still often given in AU.

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### Questions from our users and answers from the editorial team

### References

In particular, we used the information from the following sources for the topic "Length units":

### Last update on April 14th, 2021

The pages of the theme world "Units of Length" were last editorially checked on April 14th, 2021 by Stefan Banse. They are all up to date.

### Previous changes on 11/20/2020

- November 20, 2020: Extension to include advice articles on 55 inch TVs, 60 inch, 65 inch or even 75 inch TVs
- Editorial revision of all texts in this subject area

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