Length Converter

Convert between metric (mm, cm, m, km) and imperial (inches, feet, yards, miles) length units with precise calculations.

📏 Length Conversion

📊 Common Examples

📚 Length Units Guide

Millimeter (mm)

1/1000 of a meter. Used for small measurements.

Examples: Thickness of paper, small electronic components

Centimeter (cm)

1/100 of a meter. Common for everyday measurements.

Examples: Height measurements, ruler markings

Meter (m)

Base unit of length in the metric system.

Examples: Height of people, room dimensions

Kilometer (km)

1000 meters. Used for long distances.

Examples: City distances, travel measurements

Inch (in)

1/12 of a foot. Traditional imperial unit.

Examples: Screen sizes, small measurements in US

Foot (ft)

12 inches. Common imperial unit.

Examples: Height of people, room dimensions in US

Yard (yd)

3 feet or 36 inches. Used in sports and fabric.

Examples: Football field measurements, fabric lengths

Mile (mi)

5,280 feet. Used for long distances in imperial.

Examples: Road distances, running distances in US

🌍 Length Facts

Human Scale

Average human height is about 1.7 meters (5.6 feet), and arm span roughly equals height.

Speed of Light

Light travels 299,792,458 meters per second - this defines the meter since 1983.

Earth Circumference

Earth's circumference is about 40,075 km (24,901 miles) at the equator.

Imperial Origins

The foot was originally based on the length of a human foot, varying by region.

🔄 Quick Reference

Common Metric Conversions

  • 1 m = 100 cm = 1,000 mm
  • 1 km = 1,000 m
  • 1 cm = 10 mm

Common Imperial Conversions

  • 1 ft = 12 inches
  • 1 yard = 3 ft = 36 inches
  • 1 mile = 5,280 ft = 1,760 yards

Metric ↔ Imperial

  • 1 inch = 2.54 cm
  • 1 ft = 30.48 cm
  • 1 mile = 1.609 km
  • 1 m = 3.281 ft