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Free length converter to convert between meters, feet, inches, kilometers, miles, and more. Switch between metric and imperial length units instantly. Supports 20+ length units including nautical miles, light years, astronomical units, and parsecs. Perfect for construction, engineering, science, and everyday measurements.
Last updated: January 23, 2026
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Millimeters
100,000 mm
Centimeters
10,000 cm
Meters
100 m
Kilometers
0.1 km
Inches
3,937.0079 in
Feet
328.084 ft
Yards
109.3613 yd
Miles
0.062137 mi
Nautical Miles
0.053996 nmi
Conversion Tips:
Unit categories
Metric, Imperial, Astronomical
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles, light years, and more
Speed
Instant calculations
See results in all units immediately as you enter or change values
Precision
Based on international standards
Uses exact conversion factors from NIST and international standards
Use cases
Blueprints, Measurements, Planning
Convert measurements for construction plans, engineering drawings, and building projects
Astronomical units
Light Years, Parsecs, AU, Sun Radii
Convert astronomical distances for scientific calculations and space measurements
Applications
Height, Distance, Travel, DIY
Convert measurements for height, distance, travel planning, and home improvement projects
For a length of 100 meters:
Feet
328.1 ft
Inches
3,937 in
Our length converter uses meters as the base unit for all conversions. When you enter a length value in any unit, the calculator first converts it to meters, then displays the equivalent in all other supported units. This ensures accurate conversions across all measurement systems.
Meters to Feet:feet = meters × 3.281Inches to Centimeters:centimeters = inches × 2.54Kilometers to Miles:miles = kilometers × 0.6214All conversions are based on international standards. For example, 1 inch = 2.54 cm exactly, and 1 meter = 3.28084 feet (approximately 3.281 feet).
Length units are organized into three main categories:
Based on powers of 10. Common units: millimeters (mm), centimeters (cm), meters (m), kilometers (km).
1 km = 1,000 m = 100,000 cm
Used primarily in the United States. Common units: inches (in), feet (ft), yards (yd), miles (mi).
1 mi = 1,760 yd = 5,280 ft
Used for very large distances. Includes: light years (ly), parsecs (pc), astronomical units (au).
1 ly ≈ 9.461 × 10¹⁵ m
This converter is essential for various real-world applications:
Convert measurements for construction plans, blueprints, and building projects. Essential when working with both metric and imperial measurements in construction and engineering.
Convert distances for travel planning, navigation, and route calculations. Convert between kilometers and miles for road trips, or use nautical miles for maritime navigation.
Convert measurements for scientific calculations, research, and data analysis. Use astronomical units for space measurements or precise metric units for laboratory work.
Convert measurements for height, clothing sizes, furniture dimensions, and home improvement projects. Perfect for converting between metric and imperial measurements in daily life.
Need other conversion tools? Check out our area converter and feet to inches calculator.
Get Custom Calculator for Your PlatformResult: 5 meters = 16.405 feet = 196.85 inches
5 meters equals 16.405 feet, 196.85 inches, 5.468 yards, or 500 centimeters.
Result: 10 kilometers = 6.214 miles
10 kilometers equals 6.214 miles, 10,000 meters, 32,810 feet, or 5.4 nautical miles.
12 × 2.54 =
30.48 cm
3 × 0.3048 =
0.9144 m
1 × 1.609 =
1.609 km
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