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 a tool that enables quick change between length units in both imperial and metricunits, but it's not just that. It's also equipped with twenty different types of measurement units for length.

• anangstrom (A)
• Picometers (pm)
• nanometers (nm)
• micrometers (mm)
• millimeters (mm)
• centimeters (cm)
• decimeters (dm)
• meters (m)
• centimeters, meters and meters
• kilometers (km)

• 1,000ths of an inch (mil /thou)
• inches (in)
• feet (ft)
• feet and inches
• yards (yd)
• miles (mi)

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

The length conversion calculatorworks by typing units (up to 11 in the same calculation) into the tool. This length converter then returns your results for each unit in real time. Click on the name of the unit in case you wish to convert the length conversion to an alternative unit to the ones used from the Omni team. If you're trying to change between units of area, a different tool we recommend is the

Length conversion table

To learn what conversion factors are for nine length units that are popular, check out the following length conversion table:

millimeter (mm)	centimeter (cm)	meter (m)	kilometer (km)	inch (in)	foot / feet (ft)	yard (yd)	mile (mi)	miles nautical (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 " (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 that we'll round some of the conversion variables to make them fit in the table. Thus, some of these values may not be exact however they have reasonable accuracy.

Length conversion chart

If you're looking for a way to swiftly convert between various units from similar systems, look into these two simple length conversion charts:

1. Metric measurement system

To give an example:

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

1. Imperial US measurement system. US measuring system

For instance:

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

In addition, we've decided to make a list of the most requested length conversions. The most popular ones you're 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 is 3 feet and 3 3/4 inches
• 1 foot equals 0.3048 meters

1. cm to inches / inch to centimeter

Find out how many centimeters are in an inch:

• One centimeter 0.3937 inches
• 1 inch = 2.54 centimeters

1. feet to inches/ inches to feet

To convert between inches and feet you can use:

• 1 foot = 12 inches
• 1" 0.08333 feet 1/12 of a foot

1. feet to yards / yards to feet

How many feet can you fit in the yard? Three!

• 1 yard = 3 feet
• 1 foot 0.3333 yards 1/3 of one yard

1. feet to miles/ miles to miles

Have you ever wondered how many feet you can count in one 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 used in Imperial / the US metric system. The term is derived from - according to some definitions - the width of the thumb. In some languages, e.g. Norwegian, Afrikaans, Italian or French an inch originates from the word thumb or, in some cases it's the term. The 14th century saw the word "inch" was defined by the king of England as three grains of barley round and dry, placed in a row, from end to end. The definition of an inch changed through time, but by the 1950's, an international standard was accepted, and since then the inch is exactly 2.54 centimeters.

1 in = 2.54 cm

One inch is equal one-third of a yard. one-half of a meter or 1/6360 of one mile.

On a daily basis inches are utilized in US, UK, Canada as well as other nations that were previously included in the British Empire. In addition to width, length and height can be measured in in, also different sizes are reported in units that are derived from inches (e.g. shoe size).

What is the measurement in inches, not just in the US, but worldwide?

• screen sizes of monitors, smartphones TVs, and smartphones (specifically, the diagonals of rectangular screens)
• screen resolution - PPI (pixels per inch)
• tire sizes sizes e.g. car or bike wheels,
• different sizes of pipes and tools. sizes
• Certain sports equipment utilizes the figures in inches e.g. for archery
• in the field of science, e.g. in science, e.g. microphones as well as the diameters of loudspeakers

International inch is the equivalent of: international inch is the same as:

• 10,000 tenths
• 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 in the form of ft or ') can be described as a measurement unit in an Imperial / US measurement system called metric. It's a measurement made based to the human form too as the name suggests. The measurement has been standardized in the 50s, and has since been equal to 0.3048 meters exactly:

1 ft = 0.3048 m = 304.8 mm

The usage of feet has been in use since the time of ancient times by many different civilizations, but the actual length varied between these cultures. The foot was used, e.g. in:

• Ancient Rome: 1 foot = 11.6 inches (295.7 mm). This was the standard foot, however in certain provinces, it may be as large as 13.2 inches (334 millimeters)
• Greece: 1 foot = 10.6-13.8 inches (270 350 millimeters)
• Indus cities during 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 measurement of feet also changed over the ages . It began from Roman standards, and then Belgic Celts foot of 13.2 inches or Welsh foot was introduced and then gone. The definition of feet varied depending on the region and from city to city, later even the kings altered the measurement according to their desire - e.g., Henry I was believed to have ordered to establish a new standard on the basis of his arm. After that, Edward II of England introduced some kind of standardization through the introduction of the statute foot, which was 10/11 of the original foot. The finalization of the foot length came much later, in the year 1959, which was the year that the international yard and pound treaty was accepted. Since then yard across the United States and countries in the British Commonwealth is equal to exactly 0.9144 meters. In the definition of yard by the foot, it was determined as well. Therefore, it's equivalent to:

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

In the US two types of feet are utilized on a daily basis such as the international foot and the survey foot:

1. International footAlso known as the standard feet as it was the standard foot that was established from the early 1950s. Used widely in many applications, it's equal to 0.3048 meters: 1 international foot 0.3048 m and we've used the sign to emphasize it's equal to exactly this amount. The international measure corresponds to an average human foot that has the size 13 (UK) and 14. (US male).
2. Survey foot It is the US survey foot is close in comparison with the international foot. However, the word Nearly is the key . The survey foot definition is exactly 1200/3937 meters 1 US survey foot = 1200/3937 m 0,30480060960121920243840487680975... m As you will see, this appears like a really tiny difference there is something that changes in the seventh decimal point! Which is one difference of 0,609mm 609 nm. This is a difference of one kind of foot to one that is different. What's so important? important because the difference is minimal when we are measuring relatively tiny objects, but grows significantly if we begin measuring thousands of feet, as in mapping or using state plane coordinate systems (SPCS). Further, the law on the foot of a survey differs between the 50 states:
   • 24 states have adopted legislation that states that measures to survey the population be in line with those of the US feet of the survey
   • 8 states have voted that it should be created in accordance with the the international foot
   • 18 states do not have any specifics on the conversion rate in metric units. However, do not fret too much If you require the conversion in your routine land surveying or real estate transactions the difference will be negligible for short distances (< 1 mile), so it doesn't matter which definition you settle on.
   There's one other foot measurement that is the Indian survey foot . It's described as exactly 0.3047996 M: 1 Indian survey foot = 0.3047996 meters

Feet - and the whole imperial system - is used extensively across the US. Then, it's not just there. The US is the only industrialized country in the world that hasn't officially accepted the International System of Units, commonly referred to as the System of Measurement, also known as the. Two other countries that use the imperial system are Liberia within Africa in Africa and Myanmar (also called Burma) in Southeast Asia. Canadians as well as the British use a mix of both systems - metric and imperial (e.g. men's heights are usually expressed in feet , but inches are also used).

Feet aren't widely used outside of the English-speaking world. The most obvious illustration is the measurement of elevation in the international air travel industry.

Meter definition

Meter (British English: metre) is the basic measurement of length in a number of system of metric measurement, such as those of the International System of Units (SI).

The definition of meter has changed over time as scientific methods in measuring developed. Today, it's defined as what is the route traveled by light in 1/9999,792,458 of a second.

But how was it characterized in the past?

• The first attempts to develop the meter definition started in 1790. At the time, the French National Assembly decided that the length of a brand new meters should be equal to its length as a ping-pong ball with a half-period of 1 second. Check out the accuracy of this figure with our simple pendulum calculator. Simply type 2 in the pendulum's duration box, and you'll be able to calculate the pendulum length value. It's actually close to the one meter (0.993621 meters).

• In 1973 the circumference of Earth was chosen 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 = 1/10,000,000 the quarter meridional circumference of the Earth as it stretches along the Earth's meridian through Paris
• 1799-1889 between 1799 and 1889, brass, platinum and the alloy of platinum with 10% iridium-based meter bars were made, and still serve as the basis for the the length of Earth's meridian. This was when the 1st General Conference on Weights and Measures in 1889 established the meters as the distance between two parallel lines in a typical bar made of this type of alloy. This International Prototype Meter remains in the International Bureau of Weights and Measures in Sevres close to Paris. This definition of meter was in effect until 1960 and the 11th General Conference on Weights and Measures.
• Between 1960 and 1983, the measurement was again redefined from 1960 to 1983. 1,650,763.73 wavelengths of the orange-red radiation of Krypton86 under certain conditions.
• 17th Conference defined the meter as 1/299,792,458 of how far light travels in a second, and this measurement is still in use to this day.

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

Standard	Date	Absolute error	Relative uncertainty
1/10,000,000 of 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 points of the ice, atmospheric pressure with two rolling rollers (7th CGPM)	1927	n.a.	n.a.
Hyperfine atomic transformation; 1650763.73 spectrum of wavelengths that result from a specified transition in krypton-86 (11th CGPM)	1960	4 nm	4x10 -9
The length of the pathway traveled through a vacuum of light 1/299 792 458 seconds (17th CGPM)	1983	0.1 nm	10 -10

Imperial US measurement system. US measurement system

Imperial and US measurement systems aren't exactly the same thing, but in terms of length, they are the same (they are different in terms of volume, which means e.g. the cup may contain a different amounts of fl oz in the two systems). The only countries which didn't accept the metric units were US, Liberia and Myanmar.

Six of the most commonly used US / imperial length units were included in the length converter:

• 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 excluded them from this length converter on purpose: a furlong's conversion ratio is not generally defined or defined, and a league used to be the most popular measurement within Europe along with 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
Thou (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 measuring system in metric units, commonly called"the International System of Units (SI) is an international decimal system for weights and measurements. It's widely used around the world (apart from three countries that were mentioned earlier), it's easy to use, simple and efficient. Four basic units of measurements in the metric system are:

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

Additionally, 22 units derived from them with their own names exist. They can be classified into 5 categories:

1. Electromagnetism

• Volt, an unit of electrical potential,
• ohm, an ohm unit of electrical resistance,
• tesla is a measurement unit for magnetic flux density
• weber A unit of magnetic flux,
• farad is a measurement of electrical capacitance,
• Henry is a measurement unit for electrical inductance
• Siemens, a measurement of electrical conductance,
• coulomb, a unit of electrical charge.

1. Mechanics

• watt is a measurement of mechanical or electrical power,
• newton an element of mechanical force,
• Joule A unit of mechanical, electrical or thermodynamic energy
• pascal A unit of pressure.

1. Electromagnetic radiation

• becquerel, a unit of radioactive decay
• sievert an element of absorbed ionising radiation - find the dose of radiation you received in your flight with our flight radiation calculator,
• gray is a term used to describe ionizing radiation,
• lux, a unit of luminescent flux
• lumen is a measurement of luminous intensity.

1. Circular arcs as well as spherical surfaces

• radian is a unit of circular arc,
• Steradian, a unit of an area of spherical shape.

1. Other

• the degree Celsius, a unit for thermodynamics temperature. Use this temperature converter that converts this degree Celsius to Kelvins or Fahrenheit;
• katal, a unit of catalytic action,
• hertz A unit of seconds of cycle.