Online Length/Distance Converter

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Millimeter (mm)
Centimeter (cm)
Meter (m)
Kilometer (km)
Mile (mi)
Yard (yd)
Foot (ft)
Inch (in)
Nautical mile (nmi)

What is millimeter (mm, millimetre)?

A millimeter (abbreviated as mm and sometimes spelled as millimetre) is a small unit of displacement (length/distance) in the metric system. The metric system, sometimes considered synonymous with the International System of Units (SI), is used throughout the world in the sciences and is the standard of measurement for science engineering,technology and Mathematics (STEM).

The word meter is Greek for measure. Millimeters are used to measure very small but visible-scale distances and lengths. In terms of real-world comparisons, a millimeter is roughly the size of the wire used in a standard paper clip. The metric system is based on decimals: There are 10mm in a centimeter and 1000mm in a meter. The base of the Greek-rooted words indicates that they are hundredths (centi) and thousandths (milli) of meters.

Some fractions of meters:

  • A nanometer is one-billionth of a meter.
  • A micrometer is one-millionth of a meter.
  • A millimeter is one-thousandth of a meter.
  • A centimeter is one-hundredth of a meter.
  • A decimeter is one-tenth of a meter.

What is a Centimeter?

A measure of length. It is about the width of a fingernail.There are 100 centimeters in a meter.The abbreviation is cm

A typical ruler measures up to 30 cm, like the one shown below. It has cm along the top and inches (1 inch = 2.54 cm) along the bottom.

Whats is a meter?

The metre is defined as the length of the path travelled by monochromatic light in a vacuum in 1299 792 458 of a second. The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km.

The meter is the basic unit of length in the SI system of units. The meter is defined to be the distance light travels through a vacuum in exactly 1/299792458 seconds. An interesting effect of the definition of the meter this way is that it fixes the speed of light in a vacuum to the exact value of 299,792,458 m/s. The previous definition of the meter was one ten-millionth of the distance from the geographic north pole to the equator, measured over the earth's surface in a circle running through Paris, France. Meters are abbreviated using a lower case "m" in measurements.

1 m is about 39.37 inches. This is a bit more than one yard. There are 1609 meters in a statute mile. Prefix multipliers based on powers of 10 are used to convert meters to other SI units. For example, there are 100 centimeters in a meter. There are 1000 millimeters in a meter. There are 1000 meters in a kilometer.

What is kilometer used to measure?

The kilometre (SI symbol: km; /ˈkɪləmiːtər/ or /kɪˈlɒmɪtər/), spelt kilometer in American English, is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix for 1000).

The metric system is a system of measurement that uses the meter as the basis for measuring length. A kilometer is a metric unit of length that is equal to 1,000 meters. We abbreviate kilometers using the letters km. Usually people use kilometers to measure long distances!

kilometer. The definition of a kilometer is a unit of measurement equal to 1,000 meters or . 6214 miles. An example of a kilometer is how far a person will run if she wants to run for just over 1/2 of a mile.

How many Kilo is a mile?

The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959.

A noncompetitive, relatively in-shape runner usually completes one mile in about 9 to 10 minutes, on average. If you're new to running, you might run one mile in closer to 12 to 15 minutes as you build up endurance. Elite marathon runners average a mile in around 4 to 5 minutes.

This length converter can convert between different length units, you just need to enter a original value and select the original unit in combobox, converter will quickly calculate all the values of other length units.

How To Use:

1. Input a valid numeric.

2. Select an original Length unit, such as Millimeter, Centimeter, Meter or other.

3. Click button "Convert" to calculate.

4. The calculation results will be displayed in table.

Length Converter and Distance Converter Definitions


An Angstrom is a non-SI unit of length that is internationally recognized, equal to 0.1 nanometre (nm). It is sometimes used in expressing the sizes of atoms, lengths of chemical bonds and visible-light spectra, and dimensions of parts of integrated circuits. It is commonly applied in structural biology.

Astronomical Unit

The astronomical unit (AU or au or a.u. or sometimes ua) is a unit of length that is approximately equal to the distance from the Earth to the Sun. The currently accepted value of the AU is 149,597,870,691 +/- 30 metres (nearly 150 million kilometres or 93 million miles).

Conversion units for the Length and Distance Converter

Angstroms (A), Astronomical Units (AU, UA), Centimeters (cm), Chains (ch), Decimeters (dm), Dekameters (dam), Fathoms (fath), Feet (ft), Furlongs (fur), Gigameters (Gm), Hands, Hectometers (hm), Inches (in), Kilometers (km), Light years (ly), Meters (m), Micrometers (µm), Microns (µ), Miles (mi), Milli-inches (mil), Millimeters (mm), Millimicrons (mµ), Nanometers (nm), Nautical Miles, Parsecs (pc), Picas, Points, Statute Miles (mi), Twips, Yards (yd),

How to calculate

Conversions of length and distance are performed by using a conversion factor. By knowing the conversion factor, converting between units can become a simple multiplication problem:

S * C = E

Where S is our starting value, C is our conversion factor, and E is our end converted result.

To simply convert from any unit into meters, for example, from 50 centimeters, just multiply by the conversion value in the right column in the table.

50 cm * 0.01 [ (m) / (cm) ] = 0.5 m

To convert from meters into units in the left column divide by the value in the right column or, multiply by the reciprocal, 1/x.

0.5 m / 0.01[ (m) / (cm) ] = 50 cm

To convert among any units in the left column, say from A to B, you can multiply by the factor for A to convert A into m then divide by the factor for B to convert out of m. Or, you can find the single factor you need by dividing the A factor by the B factor.

For example, to convert from centimeters to inches you would multiply by 0.01 then divide by 0.0254. Or, multiply by 0.01/0.0254 = 0.3937007. So, to convert directly from cm to in you multiply by 0.3937007.

Another way to look at it is that conversions are performed by multiplying the value to convert by the ratio of 1 input unit in meters to 1 output unit in meters. For example, to convert inch to mile: 1 inch = 0.0254 meters; 1 mile = 1609.344 meters. The ratio of 0.0254 (meter/inch)/ 1609.344 (meter/mile) = 1.5783e-5 mile/inch. The formula for converting 2345 inches to miles is [ 2345 inches * 1.5783e-5 mile/inch = 0.037011 miles ].

Measuring Length and Distance Units

The basic unit for length and distance in the International System of Units (SI) is a meter. Derivatives of the meter, such as kilometers and centimeters, are also used in the metric system. Units such as inch, foot, and mile are used where the metric system is not accepted, such as in the USA and the UK.

Distances in Science

Sciences like Biology and Physics work with very small distances, therefore additional units are used. A micrometer is 1×10⁻⁶ of a meter. It is commonly used in biology to measure microorganisms, as well as for measuring infrared radiation wavelengths. It is also known as micron and is represented by the sign µ. Nanometer (1×10⁻⁹ of a meter), picometer (1×10⁻¹² of a meter), femtometer (1×10⁻¹⁵ of a meter), and attometer (1×10⁻¹⁸ of a meter) are also used.

Distances in Navigation

Navigation uses nautical miles. One nautical mile equals 1852 meters. Historically it was defined as one minute of arc along the meridian or 1/(60×180) of a meridian. This allowed for simplified calculations of latitude because every 60 nautical miles were one degree of latitude. When calculating speed using nautical miles, often knots are used as units. One knot equals the speed of one nautical mile per hour.

Distances in Astronomy

In astronomy, because of the great distances under consideration, additional units are used for convenience.

An astronomical unit (AU, au, a.u., or ua) equals 149,597,870,700 meters. There is a constant, the unit distance, of the value of one astronomical unit. It is denoted as A. Earth is about 1.00 AU from the Sun.

A light-year (ly) equals 10,000,000,000,000 km, or 10¹³ km. It represents the distance that light travels in one Julian year in a vacuum. It is used more often in popular culture than in astronomical calculations.

Online Length Calculators

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