Free online length conversion Calculators

Our free online length converter calculators are equipped with providing quick conversion between the units of length and provide you with the results within a matter of seconds.

Enter the length in one of the text boxes and press the Convert button:



Online Length Conversion Calculators

Online Length conversion calculators are tools available for helping people from different countries convert their required value in the scale that is common in their region. However, let us first explore in this article what length actually is and what sort of measuring units are used worldwide to calculate and denote length as a physical quantity.

What is Length?

Length is one of the mathematical dimensions shaping up an area longitudinally. It is the measurement of distance and is a scalar quantity defining dimension distance. It is called a scalar quantity because it gets measured in magnitude regardless of the direction. It is a physical quantity measuring up an object from end to end and counts as one of its 3 dimensions.

For example, if we measure the volume of a 3D form or area of a 2D square shape, the greatest of the three dimensions. i.e. length, breadth, and height, or greater of the two dimensions i.e. length and breadth respectively would be the length.

Across the world, several measurement systems are being used in scientific communities, and for length as well, we have various measuring units. Most of the systems select a base unit and other secondary units can be derived from that one. Sometimes, length is also perceived as a height of a three-dimensional object and is also called vertical length.

The Need for Length Measurement in a Standard Way

From a historical perspective, measurement was very important yet difficult due to no fixed scales or units. However, people used to solve these issues by manual measurement with hands, sticks, fingers, etc. At first, this was enough but when more trade and commerce opportunities rose and people started facing trouble in keeping up with the demand of businesses, the need for standard measurement units became stronger.

Thus, different units were introduced to measure both horizontal, vertical, and 3D length or depth of an object. As technology became more advanced, even the minute measurements were being calculated in a standard way. In most fields now accurate measurements are required and there is no room for error. For example, in aeronautical engineering and electronics, etc.


  • Concerning area and volume, we can say that length is a spatial dimension denoting one factor, while area represents two dimensions and volume represents three. That is why the area is measured as a square of the length (l2) and volume is measured as a cube of the length (l3). According to Einstein's theory of relativity, length is no longer understood as a set constant in one frame of reference. It varies according to the observer's frame of reference, how fast he is moving relative to the object, and other factors.
  • In Euclidean Geometry, length is measured along segmented lines and they are straight. Unless, specifically instructed to do otherwise, according to ancient mathematicians length was a dimension for straight objects. Measuring distance from point A to B on a straight line is considered its longitudinal dimension. Euclid even described the line as a breadthless length. In a triangle, however, length is equivalent to the altitude or height between the base and the vertex. According to the Pythagorean approach, the longer side of the right-angled triangle is called the hypotenuse.


  • As length has different scales and measuring units, the symbols for each scale vary according to the name it is given. For eg. Length is denoted by a simple "l" when referring to it in a mathematical or geometrical context. Such as, when talking about the length of a square.
  • Similarly, when talking about length in physical sciences and engineering, the quantity synonymous with distance is often denoted by "d" or "s".
  • Historically, length measurement was inspired by the length of body parts such as arms, hands, fingers distance, the distance between any two notable landmarks on the Earth, some paces or footsteps, etc. These sort of length measurements were arbitrary though. Now it is more standardized. Often the thickness of a slab is also measured as the length in linear thermal expansion and is denoted by L. Also, the radius of a cylinder and its height i.e. [r] or [h] is denoted by the capital "L" representing length as a dimension there.

Measuring Units

  • According to Wikipedia, a unit of length can be any arbitrary reference unit for measuring the length of an object. However, in the standard SI base unit system, the basic metric unit of length is "meter"denoted by "m". In contemporary times, length is measured in a more calculated and accurate manner and not in a random,  arbitrary way. Therefore, some set metric units are used for measuring lengths of different scales.

    For greater or shorter distances there are several smaller and larger units available in the SI system. These units are commonly used at a global level. In the U.S. a set of Customary units is most prevalent. Before the independence of the United States from the British empire, English units were used for measuring length. The Imperial units or Imperial system is still under use in the territories of England and some other regions.

    The metric system for measuring length can be categorized into two different sections. SI units and non-SI units. Common standard SI basic and derived units of length include:

  • Meter (m)
  • Kilometer (km)
  • Centimeter (cm)
  • Millimeter (mm)
  • Decimeter (dm)

Some common non-SI units of length are:

  • Inch (in)
  • Foot (ft)
  • Yard (yd)
  • Mile (mi)
  • Nautical Mile (nmi)


  • Length is one of the physical dimensions that represents an object's physical appearance and quality. In physics, length is one of the five fundamental properties of matter to define its structure and explain its shape to the observers.

    As various terms for an object's length are used, these references vary according to the particular context we are observing an object. Such as length as height, length as depth, length as the hypotenuse of a right-angled triangle, etc. However, length is not expressed as a surface dimension when talking about 3D systems due to its straight, one-dimensional property.

  • Most physicists define length as an extensive property. The sum of the ratio of an extensive property becomes intensive when we add further dimensions to the 2D systems such as a cube form where volume is v=l3.

    As an intensive property sometimes it is arbitrary as is defined as the unit length of a system. Such as in hollow shapes like spheres. The multiple of a unit length becomes an extensive property such as when the measuring length of a 5m rod. The unit remains the same even if the rod is halved and the distance is divided. Each half will be 2.5m in length.


  • Mostly length is used to define the size of an object linearly from one end to another. It is the largest dimension in 2D systems and the highest one in 3D systems. Most formulas in physics and mathematics are incomplete without length calculations. You cannot define an area or volume of a place or an object without figuring out its length first.
  • Travelers would be well aware of the distances they cover during their road trips and sea voyages. Distances are always defined in the metrics of length. From meters to kilometers and from kilometers to miles, you just cannot do without length measurements.

    Even the clothes we wear have to be calculatedly cut and sewn after accurate measurements in inches, feet, and yards to be transformed from the simple fabric into a beautiful, wearable dress. So, length is very significant in determining the right size of an object.


  • The length dimension has an extensive application in several fields of science and engineering. Whether it is general physical, applied physics, analytical geometry, trigonometry, mathematical sciences, or even graphic designing, etc. The use of length is common and its correct measurement is very important in conducting different error-free calculations.
  • In some branches of geometry such as spherical geometry, length is often measured along curved paths defying its standard, straight-line measurement definition. These curved paths are called geodesics. Length is also measured to calculate the distance along the great circles of a sphere. Arc length is often measured in radians denoted by s.
  • In graph theory, length is used to define the path or cycle along the vertices of a graph and is expressed as some edges on an unweighted graph (an unweighted graph is the one that has no set numerical value assigned to the graph edges.).

Equation / Formula

  • The length of a square can be calculated if you have a breadth value available. As each side is equal in a square, using the following formula for Area, you can derive length easily:


you can derive length, you will understand that length here is equal to the breadth and A is l2.

  • The length of a rectangle can be calculated using the same formula equation of Area except that all sides of the rectangle are not equal:


  • An arc length for a circular object is calculated by using the following formula equation:

s=r θ

Where s= arc length

r= radius of a circle

θ= measurement of the angle

  • A length of a hypotenuse in a right-angled triangle is calculated by applying the Pythagoras theorem:


Why is Length Conversion Important?

Length conversion is very crucial to determine the dimensions of 2D shapes and 3D forms. Distances are also calculated when we know how to calculate length and how to express it in appropriate units. The length conversion calculator helps us in converting our values to a proper scale that can be understood globally. JFT's length conversion calculator is very useful in converting your distance or longitudinal measurement values according to the most suitable metric unit as per your requirement and implementation.

Across the globe, there are various scientific fields and several purposes for which you may require length conversion from one metric unit to another. It proves to be quite tiresome at the end of the day to run manual calculations whenever you need to convert your length values. Additionally, the chances of error may bother you, in the long run, more than the clumsy calculation itself. That is why referring to an online length conversion calculator makes your work conveniently easy.

  • There will be instances when a value of length in meters may not suffice for long-distance calculations and you would need to convert it to kilometers or miles.
  • Similarly, an arbitrary value of length measured by random body parts such as hand or pace measurement may become troublesome in getting the correct figures for cutting a wallpaper for your room renovation. You may require to convert them into inches or feet.
  • As a carpenter, length conversions become part and parcel of your occupation. In a daily job, people seek easy, practical, and quick solutions to acquire accurate results. So, the need for switching from meters to inches, from inches to feet, and from centimeters to feet again, etc. cannot be denied.
  • Just like that, in your smaller calculations such as when designing an intricate graphical pattern, you may require values in precise centimeters frequently and would love to resort to an easy length conversion calculator to provide you with the correct values.

Centimeter to Meter Conversion

A centimeter is the hundredth part of a meter which is the basic unit of length. A meter is equal to 100 centimeters. A centimeter value is expressed by "cm". For eg:

1m = 100 cms


1 cm = 0.01 m

Meter is a larger unit and a centimeter is the smaller one. To convert the centimeter value to a meter, we will use the division method. The following equation can be used to convert values from centimeter to meter:

L (m) = L (cm) ÷ 100

For instance, length = 200 in

So, m= 200/100

L(m)= 2 m

For automatic calculation, just use our centimeter to meter conversion calculator.

Decimeter to Meter Conversion

A decimeter is the 10th part of a meter. It means that a meter is equal to 10 decimeters as deci refers to 10. To convert decimeter to meter, divide the value in decimeter by 10.

For eg.

30 dc = 30/10 m

30 dc = 3 m

To get the converted values automatically use our online length conversion calculator here.

Centimeter to Decimeter Conversion

To convert centimeter to decimeter just divide the length value by 10.

For eg. 500 cm =? DC

500 cm = 5/10 dc

500 cm = 0.05 DC

To convert the value from centimeter to decimeter instantly using our online length conversion tool, click here.

Meter to Centimeter Conversion

The meter is a larger scale as discussed earlier so when converting it to centimeters which is a smaller scale, we will use the multiplication method. Whatever value in centimeters you have, just multiply it by a hundred to get the value in meters.

1 m = 100 cm


 5m = 5×100 cm

5m = 500 cm

To convert meter to centimeter online, use our automatic length conversion calculator here.

Inch to Centimeter Conversion

A centimeter is converted to an inch by following the reference equation:

1 inch = 2.54 centimeters

By multiplying the value in inches by 2.54 you will get the value in centimeters.

For eg. 50 inches = 2.54 × 50 centimeters

50 in = 127 cm

For automatic calculation of length from inches to centimeters, use our inches to centimeter conversion calculator.

Centimeter to Inch Conversion

To convert centimeters to inches, the multiplication method would be reciprocated. As a centimeter is smaller than an inch, instead of multiplication, we will divide the length value in centimeters by 2.54 to get the value in inches.

For eg.

127 cm = 127/2.54 in

127 cm = 50 in

For simple and instant conversion in a hassle-free manner, use our online centimeters to inches converter.

Inch to Feet Conversion

To convert inches to feet, remember the fact that a foot is equal to 12 inches. Therefore, to convert from inches to feet divide the length value in inches by 12. Following the equation below you will get your value from inches to feet.

12 inches = 1 foot

60 inches = 60/12 feet

60 in = 5 ft

For converting any value from inch to feet using our online inch to feet conversion.

Feet to Inch Conversion

To convert from feet to inches the formula will be reciprocated and we will apply the multiplication method instead of division.

5 ft = 5×12 in

5 ft = 60 in

To use our automatic feet to inches length conversion tool, click here.

Centimeter to Feet Conversion

A centimeter can be converted to feet by using this equation:

1 ft = 30.48 cm

So, 500 cm = 500/30.48 ft

500 cm = 16.4 ft

To convert your length value from centimeters to feet use our handy Centimeter to feet converter.

Feet to Centimeter Conversion

To convert the length value from feet to centimeters you can reverse the above equation and apply the multiplication method instead. Follow this equation:

1 ft = 30.48 cm

15 ft = 15×30.48 cm

15 ft = 457.2 cm

For an error-free conversion use our online feet to centimeters length conversion calculator.

Meter to Kilometer Conversion

A kilometer equals 100 meters as kilo means 100. To convert meters to kilometers we have to use the division method as obviously the meter scale is smaller than the kilometers scale. Just divide the length value in meters by 100 to get the value in kilometers.

1 km = 100 m

1m = 1 / 100 km

600 m = 600/100 km

600 m = 6 km

To convert it faster instead of doing it in a slow, manual way, use our online meter to kilometer converter.

Kilometer to Meter Conversion

To convert kilometers to meters we can multiply the length value in kilometers by 100. Following the same equation:

1 km = 100 m

6 km = 6×100 m

6 km = 600 m

You can easily access our online kilometer to meter conversion tool for quick length conversions.

Meter to Millimeter Conversion

A millimeter equals 1000 meters and milli means 1000. To convert the meter to millimeters again use the division method. By dividing the length value in meters by 1000 you will get the value in millimeters.

1 mm = 1000 m

80 mm = 80/1000 m

80 mm = 0.08 m

To convert and cross-check use our online meter to millimeter converter.

Millimeter to Meter Conversion

By reversing the above equation you will get the converted value from millimeter to meter. Reversing the division will lead you to a multiplication of the length value in millimeters by 1000.

1 m = 1× 1000 mm

5 m = 5× 1000 mm

5 m = 5000 mm

To convert from millimeter to meter using our online length conversion calculator you can visit this link. You can also run simultaneous conversions through this link.

Centimeter to Millimeter Conversion

A centimeter equals 10 millimeters. To convert the length value from centimeter to millimeter, multiply the value by 10.

1 cm = 10mm

50 cm = 50×10 mm

50 cm = 500 mm

To convert from centimeter to millimeter use our online centimeters to millimeters converter from our range of length conversion calculators.

Millimeter to Centimeter Conversion

To convert millimeters to centimeters the process would be reversed of course. Instead of multiplying the length value by 10, now you will divide it.

1 cm = 10 mm

1 mm = 1/10 cm

500 mm = 500/ 10 cm

500 mm = 50 cm

For ease of conversion, you can access our online millimeters to centimeters conversion from our range of online length converter calculators.

Kilometer to Mile Conversion

A kilometer is a little bit greater than a mile. To convert distance from kilometers to miles, consider this equation:

1 km = 0.621 mile

By multiplying the value in kilometers by 0.621 you will get the distance in miles.

For eg.

10 km = 10×0.621 miles

10 km = 6.21 miles

For converting from kilometers to miles using JFT's handy length conversion calculator, click here.

Mile to Kilometer Conversion

To convert from miles to kilometers you can reverse the method and divide the length value by 0.621.

For eg.

6 mi = 6/0.621 km

6 mi = 9.66 km

Using our online miles to kilometers converter you don't have to go through tedious, manual calculations though. Just access the mentioned link and let the automatic calculator do the rest.

Nautical Mile to Mile Conversion

Specifically used in marine navigation and aeronautical sciences, a nautical mile is a unit of length representing the meridian arc length. It is a non-SI unit and is equal to 1,852 meters. Used to measure mostly distance underwater, the nautical mile is different from the other commonly-used unit called mile and is slightly longer in comparison.

1 nautical mile or nmi = 1.1508 mi approx

By multiplying the value in nmi by 1.15 you will get the value in mi.

For eg.

50 nmi = 50 × 1.1508 mi

50 nmi = 57.54 mi approx

For easy, online length conversion from a nautical mile to Mile, use our tool here.

Mile to Nautical Mile Conversion

To convert a value from mile to nautical mile reverse the formula by using division instead of multiplication.

1 mi = 1/1.15 nmi

75 mi = 75/1.15 nmi

75 mi = 65.17 nmi

Use our online length conversion calculator for more accurate and faster results.

Meter to Yard Conversion

Meters and yards are most often used in the context of the clothing and textile industry. A meter equals 1.09 yards. So it is slightly larger than a yard.

To convert from meters to yards, consider this equation:

1 m = 1.09 yd

60 m = 60×1.09 yd

60 m = 65.4 yd

By multiplying the length value in meters by 1.09 you will get the value in yards. The major difference between meter and yard is that the former is a base unit of length in the SI metric system while the yard is a non-SI, English unit used historically for arrow length and cloth measurement. According to the U.S. customary system of units, a cloth-yard that is used to measure cloths is normally 37 in long.

For error-free meter-to-yard conversion, you can access our online length conversion calculators.

Yard to Meter Conversion

In contrast, to convert the value from meters to yards reverse the equation above. By applying the division method instead of multiplication, you can divide the length value in yards by 1.09 to convert it to meters.

1 yd = 1/1.09 m

65 yd = 65/ 1.09 m

65 yd = 59.6 m

By accessing our online length conversion calculators, you can convert your length value from yards to meters easily and efficiently.

How does Length Conversion work?

Length conversion just like any other scientific value conversion is not rocket science. However, as there are certain formulae to follow and units to remember due to the varying scales according to the field of application, region, and purpose, the manual conversion becomes quite bothersome and time-consuming.

Especially, if you have to do it frequently in your line of work, studies, or routine job. This is why an online length conversion calculator has been introduced to help you convert your values easily.

Without having to download any mobile application or desktop conversion tool, you can just visit our site to calculate your length digitally. You don't even have to input any working formula or pay attention to the scientific principles or have to avail any background knowledge before performing the conversions.

The formula and scientific details are already incorporated into the system and the calculation code has been embedded as well. You just have to access the link for conversion. It is as simple and practical as it gets.

How Can Our Online Length Conversion Calculator Work for You?

JFT's online length conversion calculator presents a go-to solution for your length conversion needs. Whatever scientific field you belong to and whatever metric system and unit you seek to convert your value in, all your queries are answered here. If you are a seamstress, you would require constant fabric measurements to acquire precision in your craft. Fabrics are marketed with different measuring units according to the countries and frequent length conversions are required to let you relate to them.

Similarly, if you are associated with the automobile industry, car distances are often measured in kilometers per hour, however, some distances are measured in miles as well. Also, if you are a professor of astronomy, you may require quick conversions to let your students understand long distances between planets, stars, and other heavenly bodies measured in light-years.

Or even if you are a junior high schooler, assignments related to physics and mathematics require fast and accurate conversions to solve important numerical. For this reason, the length conversion calculator can be useful for people from every walk of life in one way or the other.

How to Use Our Online Length Conversion Calculator?

Using our length conversion calculator is easy. There are a few simple steps to follow while converting from one chosen unit to another. Some links have simultaneous conversion facilities to save you time and effort. Or you can access the specific links for your chosen unit conversion combination.

Follow these quick steps each time you want to use our length conversion calculator:

  • You will see the field boxes to enter your value. Each field corresponds to a specific length unit. Choose your unit of conversion and "enter your value".
  • Then click the "convert".
  • Your value will be calculated instantly and your targeted unit of conversion will be shown with your calculated value.
  • After your previous conversion, you can click on the "reset"button to start anew.
  • For switching the selected unit combination for conversion, you can just press the "swap"button to reverse the set conversion method.
  • For your enhanced understanding, we have a field for showing you the working calculation behind the conversion that is happening.

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