Length Unit Converter

Convert between metric, imperial, and other length units instantly. From millimeters to light years, get accurate conversions with detailed explanations and conversion history.

Real-time ConversionHigh PrecisionMultiple Unit Systems
Length Unit Converter
Convert between metric, imperial, and other length units instantly

Base unit of length in SI system

12 inches

Common Conversions
Quick access to frequently used conversions
All Unit Conversions
1 Meter equals:
Millimeter
One thousandth of a meter
0 mm
Centimeter
One hundredth of a meter
0 cm
Kilometer
One thousand meters
0 km
Understanding Length Units
Learn about different measurement systems

Metric System

The metric system is based on powers of 10, making conversions straightforward. The meter is the base unit.

  • • 1 kilometer = 1,000 meters
  • • 1 meter = 100 centimeters
  • • 1 centimeter = 10 millimeters

Imperial System

The imperial system is primarily used in the United States and has historical origins.

  • • 1 mile = 5,280 feet
  • • 1 yard = 3 feet
  • • 1 foot = 12 inches

Special Units

Some units are used for specific purposes or very large distances.

  • • Nautical mile: Used in aviation and marine navigation
  • • Light year: Distance light travels in one year (astronomy)
  • • Astronomical unit: Average Earth-Sun distance

Why Use Our Length Converter?

Professional-grade conversion tool with advanced features

Instant Conversion

Real-time calculations as you type with high precision results

Multiple Units

Support for metric, imperial, and specialized measurement units

Conversion History

Track and save your recent conversions for easy reference

Frequently Asked Questions

How accurate is the length converter?

Our converter uses precise conversion factors and can display results up to 8 decimal places. For scientific notation, we use exponential format for very large or small numbers.

What units can I convert between?

We support metric units (mm, cm, m, km), imperial units (in, ft, yd, mi), and specialized units like nautical miles, light years, and astronomical units.

How do I convert feet to meters?

Select "ft" as your input unit and "m" as your output unit, then enter your value. The conversion factor is 1 foot = 0.3048 meters.

Can I copy the conversion results?

Yes! Click the copy button next to any result to copy it to your clipboard. You can also save conversions to your history for later reference.