Length Converter

Convert between metric, imperial, and other length units. From nanometers to light years, get accurate conversions for any length measurement.

Convert Length

Category: Metric

Category: Imperial

Quick Values

Conversion Result

100 m = 328.08399 ft
From Unit
Meters (m)
1 m = 1 meters
To Unit
Feet (ft)
1 ft = 0.3048 meters

Unit Categories

Metric Units

Meters (m)1 m
Kilometers (km)1000 m
Centimeters (cm)0.01 m
Millimeters (mm)0.001 m
Micrometers (μm)0.000001 m
Nanometers (nm)1e-9 m

Imperial Units

Inches (in)0.0254 m
Feet (ft)0.3048 m
Yards (yd)0.9144 m
Miles (mi)1609.344 m
Nautical Miles (nmi)1852 m

Other Units

Angstroms (Å)1e-10 m
Light Years (ly)9460730472580800 m
Parsecs (pc)30856775814913670 m
Fathoms (fathom)1.8288 m
Cubits (cubit)0.4572 m
Hands (hand)0.1016 m

About Length Converter

Our comprehensive length converter helps professionals, students, and everyday users convert between different length measurement systems with precision and ease. This essential tool supports metric, imperial, and specialized units, providing accurate conversions for engineering, construction, science, and daily life applications.

What It Converts

  • Metric Units: Meters, centimeters, millimeters, kilometers
  • Imperial Units: Feet, inches, yards, miles
  • Specialized Units: Astronomical units, nautical miles, light years
  • Precision Conversions: Accurate to multiple decimal places
  • Bidirectional Conversion: Convert in both directions
  • Unit Categories: Organized by measurement system

Measurement Systems

Metric System
  • Base Unit: Meter (m)
  • Advantages: Decimal-based, internationally standardized
  • Common Units: km, m, cm, mm, μm, nm
  • Prefixes: Kilo, centi, milli, micro, nano
  • Global Use: Scientific and most countries
  • Precision: Easy decimal calculations
Imperial System
  • Base Units: Yard, foot, inch
  • Advantages: Familiar to many, practical divisions
  • Common Units: mile, yard, foot, inch
  • Conversions: 12 inches = 1 foot, 3 feet = 1 yard
  • Primary Use: United States, some other countries
  • Precision: Fractional divisions common

Understanding Your Results

Input Value

Original measurement

From Unit

Source unit

To Unit

Target unit

Result

Converted value

How to Use

Enter the length value you want to convert, select the source unit (from), choose the target unit (to), and click convert. The calculator will instantly provide the converted value with high precision. Use the swap button to reverse the conversion direction, and quick value buttons for common inputs.

Common Conversion Factors

Metric to Imperial:

  • 1 meter = 3.28084 feet
  • 1 kilometer = 0.621371 miles
  • 1 centimeter = 0.393701 inches
  • 1 millimeter = 0.0393701 inches

Imperial to Metric:

  • 1 foot = 0.3048 meters
  • 1 mile = 1.60934 kilometers
  • 1 inch = 2.54 centimeters
  • 1 yard = 0.9144 meters

Specialized Units

Astronomical Units
  • Light Year: Distance light travels in one year
  • Astronomical Unit: Average Earth-Sun distance
  • Parsec: 3.26 light years
  • Use Case: Astronomy and space science
  • Precision: Extremely large distances
  • Examples: Star distances, galaxy measurements
Nautical Units
  • Nautical Mile: 1.852 kilometers
  • Fathom: 6 feet or 1.8288 meters
  • Use Case: Maritime and aviation
  • Advantage: Based on Earth's circumference
  • Navigation: Chart and GPS compatibility
  • International: Standardized maritime use

Practical Applications

  • Engineering: Technical drawings and specifications
  • Construction: Building plans and measurements
  • Science: Laboratory measurements and research
  • Travel: Distance planning and navigation
  • Education: Math and science learning
  • International Trade: Product specifications and shipping

Conversion Accuracy

  • Precision: High decimal accuracy maintained
  • Rounding: Appropriate significant figures
  • Validation: Cross-checked conversion factors
  • Standards: Based on international definitions
  • Updates: Reflects current measurement standards
  • Reliability: Consistent and dependable results

Conversion Tips

  • Double-Check: Verify results with known conversions
  • Unit Selection: Choose appropriate precision units
  • Context Matters: Consider application requirements
  • Standard Units: Use common units for communication
  • Documentation: Keep conversion records for reference
  • Practice: Regular use improves estimation skills

Common Conversion Mistakes

  • Unit Confusion: Mixing up similar units
  • Decimal Errors: Incorrect decimal placement
  • Direction Errors: Converting in wrong direction
  • Precision Loss: Over-rounding results
  • Context Ignorance: Using wrong units for application
  • Formula Errors: Incorrect conversion factors
Pro Tip

When working with length conversions, always consider the context and required precision. For engineering and scientific applications, maintain high precision and use standard units. For everyday use, round to practical decimal places. Remember that different fields may prefer specific units - architects often use feet and inches, while scientists prefer meters. Keep a reference of common conversion factors for quick mental calculations and verification.

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