Length Converter

Free online length converter with 130+ units. Convert metric, imperial, nautical, astronomical, ancient, Asian, surveying, and typography lengths instantly.

👆Enter a value and select your units to convert

How to Use the Length Converter

Enter a length value, select the source unit from any of the 11 categories (Metric, Imperial, Nautical, Astronomical, Scientific, Surveying, Typography, Ancient, Asian, European Historical, Miscellaneous), and select the target unit. Results and a full grouped conversion table appear instantly. Use the search box to filter the 130+ units by name.

About This Tool

The most comprehensive free length converter online, featuring over 130 units across 11 categories. Convert everyday metric and imperial units, nautical distances, astronomical scales (light-years, parsecs, AU), ancient measures (Greek stadia, Roman miles, Egyptian cubits, Biblical reeds), Asian units (Chinese lǐ, Japanese shaku, Indian gaz), European historical measures (Russian verst, French toise, German elle), surveying units (chains, links, varas), typography (points, picas, pixels), and fun units like smoots and football fields. Pair with the Weight Converter and Speed Converter for complete unit coverage.

Quick Reference Table

Category	Example Units
Metric	km, m, cm, mm, µm, nm, Ångström
Imperial / US	mile, furlong, chain, rod, fathom, yard, foot, inch
Nautical	nautical mile, cable, shackle
Astronomical	parsec, light-year, AU, solar radius
Scientific	Planck length, Bohr radius, fermi
Surveying	Gunter’s chain/link, vara (TX/CA/Spanish)
Typography	point, pica, cicero, pixel, em
Ancient	stadion, Roman mile, Egyptian cubit, Biblical span
Asian	lǐ, shaku, ken, wa, gaz, yojana
European Historical	verst, toise, elle, legua, arshín
Miscellaneous	smoot, football field, marathon, hair’s breadth

Frequently Asked Questions

How many units does this length converter support?

Over 130 length and distance units across 11 categories: Metric, Imperial/US, Nautical, Astronomical, Scientific, Surveying, Typography, Ancient, Asian, European Historical, and Miscellaneous.

How do I convert kilometers to miles?

Multiply the number of kilometers by 0.621371. For example, 10 km = 6.21 miles. This converter handles the calculation automatically.

What is a furlong and how long is it?

A furlong is 201.168 meters (1/8 of a mile or 220 yards). Originally the length of a plowed furrow in medieval English farming, it’s still used in horse racing today.

Are the ancient length conversions accurate?

Ancient units are based on the best available archaeological and historical evidence. Values like the Greek stadion (~185 m), Roman pes (~0.296 m), and Egyptian royal cubit (~0.524 m) are widely accepted by historians.

Can I convert astronomical distances?

Yes. The Astronomical category includes light-years, parsecs, astronomical units, lunar distances, and stellar radii — perfect for astronomy enthusiasts and students.

Do I need to sign up to use this tool?

No. It is completely free with no account or signup required.