Length Converter

Welcome to our Length Unit Converter, one of the best and most efficient tools for quickly converting between various units of length. Whether you're working on a school project, engineering task, or just need a quick conversion, this calculator lets you seamlessly switch between metric and imperial units, including meters, kilometers, miles, feet, inches, and more.

Simply enter a value, select the units you'd like to convert from and to, and let our Length Unit Converter handle the rest. Make everyday tasks easier with accurate and convenient length conversions!

US / Imperial

Quarter mile
Pole
Ell
Span
Link [li]
Handbreadth
Palm
Nail
Fingerbreadth
Barleycorn
Line
Centiinch [cin]

Metric (SI)

Yottameter [Ym]
Zettameter [Zm]
Exameter [Em]
Petameter [Pm]
Terameter [Tm]
Gigameter [Gm]
Hectometer [hm]
Decameter [dam]
Attometer [am]
Zeptometer [zm]
Yoctometer [ym]

Scientific

X unit [xu]
Angstrom star [Å*]
Atomic unit [a.u.]
Bohr radius [a0]
Planck length [lp]
Electron radius [re]
Fermi [fm]

Nautical Measure

Nautical league (int.)
Nautical league (UK)
Nautical Mile (UK)
Cable (Int.)
Cable (UK)
Cable (US)

US Survey

Mile (US Survey) [mi]
Furlong (US Survey) [fur]
Chain (US Survey) [ch]
Rod (US Survey) [rd]
Fathom (US Survey) [fath]
Link (US Survey) [li]
Inch (US Survey) [in]

Astronomical

Light day [ld]
Light hour [lh]
Light minute [lm]
Light second [ls]
Jupiter Radius [RJ]
Earth Polar Radius [RE]

Historical

Arpent
Famn (Swedish)
Aln, alen (Swedish)
Arshin, arsheen (Russia)
Paris inch (French)
Ligne (French)

Asian Measures

Li (China)
Zhang (China)
Chi (China)
Ken (Japan)
Shaku (Japan)

Typographical

Cicero (French)
Em
Didot point (French)
Twip
Rounding decimals
Decimal separator
Thousands separator
Keyboard
Input size
Share result link
Click to copy all results
 

Features:

Instant Conversions – Input a value and instantly see the result.

High Precision – Our converter ensures high accuracy in every calculation, even when working with large or small values.

Extended Numerical Capability – One of the few converters that can handle extended numerical values, allowing for conversions of both very large and very small measurements.

Customizable Rounding – Choose the number of decimal places to round your results for precise control over displayed values.

Decimal and Thousands Separators – Select your preferred format with decimal and thousands separators to match regional settings.

Optimized Mobile Keyboards – Choose from multiple keyboard layouts for an enhanced mobile experience, or use your standard keyboard.

One-Tap Copying – Copy your results instantly with a single tap.

Shareable Results – Easily share conversion results with others for seamless communication and collaboration.

FAQs

Why do different countries use different measurement systems?

Different measurement systems evolved based on historical trade, science, and local standards. Over time, most countries adopted the metric system because of its simplicity and consistency, while others, such as the United States, have continued using the imperial system for historical and practical reasons.

How do I convert between metric and imperial units?

Conversions between metric and imperial units require specific conversion factors. For example, 1 inch equals 2.54 centimeters, and 1 mile is about 1.609 kilometers. Online converters, like our Length Unit Converter, allow you to easily convert values without needing to remember conversion factors.

What is the difference between the US customary system and the British imperial system?

While the US customary system and the British imperial system share similar roots, they have some differences. For instance, in the US system, a gallon is smaller than an imperial gallon, and there are slight differences in units like pints and quarts. However, both systems use inches, feet, and miles for length.

Which measurement system is more accurate?

Both metric and imperial systems are accurate, but the metric system is generally considered more precise for scientific calculations because it is based on multiples of ten, making it easier to calculate and convert.

Where do the exact conversion values come from?

All conversion values on this page are based on official data provided by the National Institute of Standards and Technology (NIST) and the International Bureau of Weights and Measures (BIPM). NIST publishes exact and internationally accepted definitions for both SI and non-SI units, including inches, feet, miles, nautical miles, meters, and more.

View the full list of conversion factors: NIST Guide to the SI, Appendix B: Conversion Factors.

For official SI definitions: BIPM – The International System of Units (SI), 9th Edition.

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