Length conversion chart

 Table of Contents:

• Length conversion table
• Length conversion chart
• Inch definition
• Feet definition
• Meter definition
• Imperial US measurement system. US measurement system
• Metric measurement system

A length converter is an application that permits quick change from length measurement units both imperial and in metric, and it's not just that. It's equipped with twenty different units of length measurement:

• anangstrom (A)
• Picometers (pm)
• Nanometers (nm)
• Micrometers (mm)
• millimeters (mm)
• centimeters (cm)
• decimeters (dm)
• meters (m)
• Centimeters and meters
• kilometers (km)

• Thousandths of an inch (mil / thou)
• inches (in)
• feet (ft)
• inches and feet
• yards (yd)
• miles (mi)

• mile nautical (nmi)
• Sun radii (R)
• the light year (ly)
• astronomical units (au)
• parsecs (pc)

This length conversion calculatorworks by typing units (up to 11 in the same calculation) into the tool. The length converter then returns your results for each unit , in real time. Click on the name of the unit when you'd like to do length conversion to an alternative unit to the ones that are defaulted from The Omni team. If you want to convert between various units of area, a different tool that we recommend is the

Length conversion table

To learn what conversion factors are among the most well-known length units take a look at the following length conversion table:

millimeter (mm)	centimeter (cm)	Meter (m)	kilometer (km)	inch (in)	foot or feet (ft)	yard (yd)	mile (mi)	the nautical mile (nmi)
1 millimeter (mm)	1	0.1	0.001	0.000001	0.03937	0.003281	0.0010936	0.0000006214	0.00000054
1 centimeter (cm)	10	1	0.01	0.00001	0.3937	0.03281	0.010936	0.000006214	0.0000054
1 meter (m)	1000	100	1	0.001	39.37	3.281	1.0936	0.0006214	0.00054
1 kilometer (km)	1000000	100000	1000	1	39370	3281	1093.6	0.6214	0.54
1.25 inches (in)	25.4	2.54	0.0254	0.0000254	1	0.08333	0.02778	0.000015783	0.000013715
1 foot / feet (ft)	304.8	30.48	0.3048	0.0003048	12	1	0.33333	0.0001894	0.00016458
1 yard (yd)	914.4	91.44	0.9144	0.0009144	36	3	1	0.0005682	0.0004937
1 Mile (mi)	1609344	160934	1609.3	1.6093	63360	5280	1760	1	0.869
1 nautical mile (nmi)	1852000	185200	1852	1.852	72913	6076	2025.4	1.1508	1

We've decided to round a few of the conversion rates to make them fit in this table. Thus, some of these numbers aren't exact, but they still have some degree of accuracy.

Length conversion chart

If you're trying to figure out how to quickly convert between different units of one system look into these two easy length conversion charts:

1. System of measurement in metric

As an example:

• 6 km = 6 * 1000 = 6000 m
• 180 cm = 180 / 100 = 1.8 m

1. Imperial / US measure system

For example:

• 5 yd = 5 * 3 = 15 ft
• 144 in = 144 / 12 = 12 ft

In addition, we've decided to make a list of the most commonly requested length conversions. The ones that you're often needing are:

1. meters to feet / feet-to-meters

If you're trying to figure out how many feet are in a meter here you are:

• 1 meter 3.281 feet which equals 3 feet 3 3/8 inches
• 1 foot = 0.3048 meter

1. cm to inches / inches in cm

Find out the number of centimeters in an inch:

• 1 centimeter 0.3937 inches
• 1 inch equals 2.54 centimeters

1. feet to inches / inches to feet

To convert between feet and inches use:

• 1 foot equals 12 inches
• 1 in 0.08333 feet 1/12 of one foot

1. feet to yards / yards to feet

How many feet in a yard? Three!

• 1 yard = 3 feet
• 1 foot 0.3333 yards, 1/3 of a yard

1. feet to miles / miles to feet

Have you ever thought about how many feet are in a mile?

• 1 foot 0.00018939 mile
• 1 yard = 5280 feet

Inch definition

The inch (abbreviate meaning "or ") can be described as a unit of length in Imperial or the US metric system. The name comes from - by some definitions - the width of the human thumb. In some other languages e.g. Norwegian, Afrikaans, Italian or French an inch originates from the word"thumb" or, in some cases it's the word. Since the 14th century onwards, an word "inch" was specified by the King of England as three grains of barley round and dry, laid from end to end, lengthwise. Inch definition varied through the centuries, but in the 1950's, an international standard was accepted, and ever since, the inch corresponds to precisely 2.54 centimeters.

1 in = 2.54 cm

One inch is also equal the equivalent of 1/36 yards, 1/12 of a foot or 1/63360 of a mile.

On a regular basis inches are commonly used in the US, UK, Canada as well as other nations that were previously members of the British Empire. The length, height, and width can be measured in in, also many sizes are expressed in units that are derived from inches (e.g. shoe size).

What can be measured in inches? And not just in the US and around the world?

• screen sizes of monitors, smartphones TVs, (specifically those with diagonals on rectangular screen)
• screen resolution PPI (pixels per inch)
• tire sizes sizes e.g. bicycle wheels or car wheels
• different sizes of pipes and tools. sizes
• certain sports equipments use the numbers of inches e.g. for archery
• in science, e.g. in science, e.g. microphones and the diameters of loudspeakers

International inch is the equivalent of: international inch is then equal to:

• 10,000 10ths
• 1,000 thou/mill
• 100 points or gries
• 72 PostScript points
• 6 computer picas
• 3 barleycorns
• 2.54 centimeters exactly
• 0.999998 US Survey inches
• 1/3 or 0.333 palms
• 1/4 to 0.25 hands
• 1/12, or 0.08333 feet
• 1/36 or 0.02777 yards

Feet definition

The foot (abbreviate to "ft," or ") is the name given to a length measurement used in the Imperial or US metric system. It's a measurement based in the human physique too, as the name indicates. The unit is standardized since the 1950s and has since been equal to 0.3048 meters precisely:

1 ft = 0.3048 m = 304.8 mm

The use of feet has been in use since the time of ancient times by many different civilizations, but the actual length differed among them. The foot was utilized e.g. in:

• Ancient Rome: 1 foot = 11.6 inches (295.7 mm). This was a standard foot, but in some provinces it could be up to 13.2 inches (334 mm)
• Greece: 1 foot equals 10.6-13.8 inches (270 - 350 mm)
• Indus cities in the Bronze Age: 1 foot equals 13.2 inches (333.5 mm)
• Egypt The equivalent of a foot is 12 inches (304.8 mm)

The public imperial measurement that is not officially recognized by the official standards, Greenwich

It was in England The foot measurement also changed throughout the centuries. It started from Roman standards, and then Belgic Celts foot of 13.2 inches or Welsh foot was introduced and then gone. The definition of the feet differed across regions, from city to city, and later the kings changed the measurements in accordance with their wishes - e.g., Henry I was said to have commanded to establish a new standard on the basis of his arm. Later, Edward II of England introduced an element of standardization through the introduction of the statute foot, which was 10/11 the size of the earlier foot. The finalization of the length of the foot was made much later, in the year 1959, when the world yard and pound treaty was signed. Since then, yard in the United States and countries in the British Commonwealth is equal to exactly 0.9144 meters. When yard was first defined, the foot could be determined as well. Thus, it's equal to:

1 foot = (1/3) * yard = (1/3) * 0.9144 m = 0.3048 m

In the US two types of feet are used in a regular basis including the international foot as well as the survey foot.

1. International footAlso named the standard foot; it's the one standardized in the 1950s. It is widely used in various applications, it's equal to 0.3048 millimeters: 1 international foot 0.3048 m in which we use the sign to emphasize it's equal to exactly the same value. The international foot measure is the equivalent of a human foot with a shoe size of 13 (UK) and fourteen (US male).
2. Survey foot It is the US survey foot is virtually identical in measurement to the international foot. But the word nearly is the key - the survey foot definition is precise 1200/3937 meters: 1 US survey foot = 1200/3937 m 0,30480060960121920243840487680975... m As you can see, it appears like a tiny difference - something changes at the 7th decimal place! It's the difference of just 0,609 mm 609 nmwhen comparing different types of feet to one that is different. What's the point? It's vital because the difference may be not significant if we're measuring small objects, but it gets more significant when we begin measuring hundreds of thousands of feet, as in mapping or using the state planar coordinate systems (SPCS). Additionally, the law governing the survey foot varies between each of the fifty states.
   • 24 states have passed laws that state that surveying methods should be based on those of the US surveys foot
   • 8 states have decided that the decision should be taken on the basis of an global foot
   • 18 states haven't specified the conversion factor from metric unitsBut do not fret too much If you require the conversion for everyday conveyances or surveying of land The difference is negligible for short distances (less than 1 mile) and it doesn't matter which definition you settle on.
   There's a different measurement for feet it's the Indian survey foot . It's described as precisely 0.3047996 m: 1. Indian survey foot = 0.3047996 m

Feet, and the entire imperial system - are used extensively within the US. Then, it's not just there. It's true that the US has the distinction of being the one industrialized nation in the world that hasn't officially accepted the International System of Units, also called the system of metric measurement. The other two countries using the imperial system are Liberia within Africa in Africa and Myanmar (also also known as Burma) located in Southeast Asia. Canadians and the British utilize a combination of both systems, imperial and metric (e.g. the height of a man is usually stated in feet , but inches are also used).

Feet aren't widely used outside of the English-speaking world. The only clear example is the measurement of altitude in international aviation.

Meter definition

Meter (British English: metre) is the primary length unit in several measurement systems, such as the International System of Units (SI).

The definition of meter has changed over time as technological methods for measuring progressed. It is now defined as an amount of time path traveled by light in 1/299,792,458 of a second.

However, how was it described prior to that?

• First trials to create the definition of meter started in 1790. At that time, The French National Assembly decided that the length of the new meter would be equal to the length of a pendulum with a half-period of one second. It is possible to determine the accuracy of this measurement using our pendulum calculator. Simply type 2 into the pendulum's time box and you'll get the length of the pendulum. Actually, it's very close to the one meter (0.993621 m).

• In 1973, the circumference of the Earth was selected as a neutral standard. The Meter was defined as one-ten millionth of the distance from the equator up to North Pole. North Pole: 1 meter is 1/10,000,000 of the quarter meridional radius of the Earth as it stretches along the meridian between the Earth and Paris
• 1799 - 1889, brass, platinum, and the alloy of platinum with 10% iridium-based meter bars were made, and still serve as an alloy with Earth's meridian length. This was when the 1st General Conference on Weights and Measures in 1889, defined the meter as the distance of two straight lines of a typical bar of the latter type of alloy. The International Prototype Meter is still kept in the International Bureau of Weights and Measures located in Sevres close to Paris. The definition of meter was up to date until 1960, and the 11th General Conference on Weights and Measures.
• From 1960 to 1983 the meters were redefined from 1960 to 1983. 1,650,763.73 wavelengths of the red-orange radiation of the krypton-86 atom under certain conditions.
• 17th Conference defined"meters" as 1/299,792,458 of the distance light travels in a vacuum in a second, and this meter definition is actual up to the present.

The table below summarizes the chronology of a meter definition (by Cardarelli, 2003).

Standard	Date	Absolute error	Relative uncertainty
1/10,000,000 in the quadrant that runs along the meridian	1795	500-100 mm	10 -4
First prototype of platinum bar standard	1799	50-10 mm	10 -5
Platinum-iridium bars at melting point of ice (1st CGPM)	1889	200-100 nm	10 -7
Platinum-iridium bar at melting point of the ice, atmospheric pressure with two rolling rollers (7th CGPM)	1927	n.a.	n.a.
Hyperfine atomic transformation; 1650763.73 the wavelengths coming from a specified transition in krypton-86 (11th CGPM)	1960	4 nm	4x10 -9
Length of the path traveled when light is in vacuum 1:597 792 458 seconds (17th CGPM)	1983	0.1 nm	10 -10

Imperial American measurement system. US measurement system

Imperial the US measurement system as well as US measurement systems aren't the same , however for length measures , they are similar (they differ in volume measures, so e.g. the cup may contain a an amount of floz that differs from the two systems). The only countries which didn't accept metric units were the US, Liberia and Myanmar.

Six of the most frequently used US imperial length units were included in our length converter:

• the thousandth of an inch (mil / thou),
• Inches (in),
• feet (ft),
• feet and inches,
• yards (yd),
• miles (mi).

There are two other length units, however we have excluded them from this length converter on purpose: a furlong's conversion ratio isn't widely defined, and the term league was widely used throughout Europe and Latin America but is no longer an official unit anywhere. However, you can find them in the following table, including the most frequently-used values:

Unit	In relation to the past	Feet	Millimeters	Meters
Then (th)		1/12000	0.0254	0.0000254
inch (in)	1000 thou	1/12	25.4	0.0254
foot (ft)	12 inches	1	304.8	0.3048
yard (yd)	3 feet	3	914.4	0.9144
chain (ch)	22 yards	66	20116.8	20.1168
furlong (fur)	10 chains	660	201168	201.168
mile (mi)	8 furlongs	5280	1609344	1609.344
league (lea)	3 miles	15840	4828032	4828.032

Metric measurement system

The Metric measurement system, also known as"the International System of Units (SI) can be described as an internationally accepted decimal system for measures and weights. It is widely used throughout the globe (apart from the three countries mentioned earlier) It is simple to understand, practical and easy to use. The four base units of the metric measurement system are:

• meter ( m) for length,
• kilogram ( kg) for mass (check out this converter for weight),
• Second ( s) for time,
• ampere (A) for electromagnetism.

In addition, 22 derivative units with special names exist. We can split them into five categories:

1. Electromagnetism

• volt, a unit of electrical potential
• Ohm, an ohm unit of electrical resistance
• Tesla, a measure of magnetic flux density,
• weber, a unit of magnetic flux
• farad, a unit of capacitance in electrical circuits,
• henry, a unit of electrical inductance,
• Siemens, a measurement of electrical conductance,
• coulomb A unit of electric charge.

1. Mechanics

• Watt watt, a measure of mechanical or electrical power
• newton A unit of mechanical force,
• Jourle A unit of mechanical, electrical or thermodynamic energy
• pascal is a measurement unit for pressure.

1. Radiofrequency

• becquerel an element of radioactive decay
• sievert an element of Ionising radiation that is absorbed. Find the radiation dose you experienced in your flight with our radiation calculator for flights,
• gray, a unit of ionizing radiation,
• lux, a unit of luminescent flux
• lumen, a unit of luminous intensity.

1. Circular arcs and Spherical surfaces

• radian, a unit of circular arc,
• Sterandian, a unit of the spherical surface area.

1. Other

• degree Celsius is a measurement in thermodynamic temperature. Check out this temperature converter which can convert this degree Celsius into Kelvins or Fahrenheit;
• Katal, a unit of catalytic action,
• hertz is a unit that measures seconds of cycle.