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Length/Distance

Convert between different units of length and distance for construction, woodworking, and engineering projects

Length/Distance Converter

Convert between different units of length and distance for construction, woodworking, and engineering projects

Conversion Result

1km
Kilometer
=
0m
Meter

Fun Facts

Planck Length (~1.6e-35 m – smallest measurable length)
If you were as tall as the observable universe, a single one of your hair follicles would still be 1,000,000,000,000,000,000,000 Planck lengths wide. Bring a microscope.

About Length/Distance

Learn about the history and standards of length measurement systems used around the world

Historical Context

Length units have evolved over centuries, with different civilizations developing their own measurement systems. Ancient Egyptians used cubits based on forearm length, while Romans introduced the mile (mille passus or 'thousand paces').

Modern Standards

Today's length measurements are standardized internationally through the SI system, though different regions may prefer different units. The United States still primarily uses imperial units like feet and inches, while most of the world uses metric units like meters and centimeters.

Did you know?

Select a unit to see interesting facts about it.

Conversion Reference

Quick reference for common length/distance conversions

Metric System

Kilometer

Meter

Decimeter

Centimeter

Imperial/US Customary

Mile

Yard

Foot

Inch

Nautical

Nautical Mile

Fathom

Cable

Astronomy

Light-Year

Parsec

Astronomical Unit

Lunar Distance

Historical

Cubit

League

Hand

Span