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Length Converter UPDATED
Convert between every length unit — from nanometers and inches to kilometers and light years. Ideal for science, astronomy, engineering, education, and daily use.
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How to Use Length Converter
1
Enter Value
Type the length value you want to convert in the input field
2
Select Units
Choose your input and output units from the dropdown menus
3
Get Results
View the converted result instantly - no button clicks needed
4
Copy & Reset
Copy the result or reset the converter for new calculations
Convert Length Units
Enter a value and select your units for instant conversion
Quick Conversions
Common reference between selected units
1 m = 3.28084 ft
1 ft = 0.3048 m
Metric System
International
Nanometer (nm)
Microscopic scale
Millimeter (mm)
Small measurements
Centimeter (cm)
Everyday use
Meter (m)
Base SI unit
Kilometer (km)
Long distances
Imperial System
US & UK
Inch (in)
Small measurements
Foot (ft)
Height, room sizes
Yard (yd)
Fabric, sports
Mile (mi)
Long distances
Nautical Mile (nmi)
Marine & aviation
Scientific Units
Astronomy & Physics
Light Year (ly)
Astronomical distances
Astronomical Unit (AU)
Solar system scale
Parsec (pc)
Stellar distances
Angstrom (Å)
Atomic scale
Micron (µm)
Microscopic scale
Real-time Conversion
Instant results as you type or change units. No page reloads needed.
25+ Length Units
Convert between metric, imperial, nautical, and scientific length units.
Mobile Friendly
Works perfectly on all devices - desktop, tablet, and mobile.
No Limits
Unlimited conversions for all users. Fast and accurate results.
About Length Converter
Perfect for engineers, scientists, students, and travelers — convert any length unit in seconds. Our tool supports all major length measurement systems used worldwide, from microscopic nanometers to astronomical light years.
Scientific Research
Engineering & Construction
Education & Learning
Travel & Navigation
Frequently Asked Questions
How accurate are the conversions?
Our conversions are highly accurate, using standardized conversion factors. Results are typically precise to 6 significant digits.
Which units are supported?
We support 25+ length units including nanometers, micrometers, millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles, light years, astronomical units, parsecs, and more.
What is the base unit for conversions?
Meters (m) is used as the base unit. All conversions are calculated relative to meters for maximum accuracy.
Do I need to refresh the page?
No! Conversions happen in real-time as you type or change units. No page refresh is needed.