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Length Converter

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Length Converter — Convert Any Unit of Length Instantly

Our free online Length Converter lets you instantly convert between 90+ units of length and distance — from everyday metric and imperial units to scientific and historical measurements. Whether you need to convert meters to feet, kilometers to miles, inches to centimeters, or even parsecs to light years, this tool delivers fast and highly accurate results with no installation required.

Length is a fundamental physical quantity that describes the size or distance of an object from one point to another. It is measured in different unit systems depending on the country, field, or industry:

  • Metric system (SI): meter (m), kilometer (km), centimeter (cm), millimeter (mm), micrometer (µm), nanometer (nm)
  • Imperial / US customary: mile (mi), yard (yd), foot (ft), inch (in)
  • Nautical: nautical mile, fathom, league
  • Astronomical: light year (ly), astronomical unit (AU), parsec (pc)
  • Typography: point, pica, twip
  • Historic & regional: cubit, furlong, chain, rod, ell, hand, span

All conversions are based on internationally recognized SI factors and use high-precision arithmetic, making this tool reliable for science, engineering, construction, education, and everyday tasks.

Common Length Conversion Reference

Here are the most frequently used length conversions for quick reference:

  • 1 meter = 3.28084 feet = 39.3701 inches = 100 centimeters = 1000 millimeters
  • 1 kilometer = 1000 meters = 0.621371 miles = 1093.61 yards
  • 1 mile = 1609.344 meters = 1.60934 kilometers = 5280 feet = 1760 yards
  • 1 foot = 0.3048 meters = 30.48 centimeters = 12 inches
  • 1 inch = 2.54 centimeters = 25.4 millimeters = 0.0254 meters
  • 1 yard = 0.9144 meters = 3 feet = 36 inches
  • 1 nautical mile = 1852 meters = 1.15078 miles
  • 1 light year = 9.461 × 10¹⁵ meters ≈ 5.879 trillion miles

Frequently Asked Questions — Length Converter

Question: How do I use the Length Converter?

Answer: Simply select the unit you are converting from in the left list and the unit you are converting to in the right list, then type the value in the input box. The result appears instantly — no need to click a button.

Question: How many centimeters are in an inch?

Answer: There are exactly 2.54 centimeters in one inch. This is the internationally agreed definition used in science, engineering, and manufacturing worldwide since 1959.

Question: How do I convert kilometers to miles?

Answer: Multiply the number of kilometers by 0.621371 to get miles. For example, 10 km × 0.621371 = 6.21371 miles. You can also use the converter above to get an instant, precise result.

Question: How many feet are in a mile?

Answer: There are exactly 5,280 feet in one statute mile (the standard land mile used in the US and UK). One mile is also equal to 1,760 yards or 1,609.344 meters.

Question: What is the difference between a meter and a yard?

Answer: A meter is the base unit of length in the metric (SI) system and equals approximately 3.28084 feet. A yard is used in the imperial and US customary systems and equals exactly 0.9144 meters (or 3 feet). A meter is about 9.36% longer than a yard.

Question: How many meters are in a light year?

Answer: One light year is approximately 9.461 × 10¹⁵ meters (about 9.461 quadrillion meters or 5.879 trillion miles). It is the distance light travels in one year through a vacuum.

Question: What is the difference between a nautical mile and a regular mile?

Answer: A nautical mile equals exactly 1,852 meters (approximately 1.15078 statute miles). It is based on the circumference of the Earth and is used in aviation and maritime navigation. A standard (statute) mile is 1,609.344 meters.

Question: What units of length are used in the metric system?

Answer: The metric system uses meter (m) as the base unit. Common multiples and subdivisions include kilometer (km = 1,000 m), decimeter (dm = 0.1 m), centimeter (cm = 0.01 m), millimeter (mm = 0.001 m), micrometer (µm = 10⁻⁶ m), and nanometer (nm = 10⁻⁹ m).

Question: How accurate are the conversions in this tool?

Answer: All conversions use internationally standardized conversion factors and high-precision arithmetic with up to 12 significant digits, making results reliable for scientific, engineering, academic, and everyday use.

Question: Can I convert between imperial and metric units of length?

Answer: Yes. The converter supports full cross-system conversion between metric units (meter, kilometer, centimeter, etc.) and imperial/US customary units (mile, yard, foot, inch), as well as nautical, astronomical, and historical units.