Length Converter

How to Use the Length Converter

The Length Converter transforms measurements between all common units of length and distance. Whether you are converting architectural blueprints from metric to imperial, measuring materials for a project, or understanding international measurements, this tool handles every conversion instantly.

Supported Units

The converter supports millimeters (mm), centimeters (cm), meters (m), kilometers (km), inches (in), feet (ft), yards (yd), miles (mi), nautical miles (nmi), and micrometers. Enter a value in any unit and see all other conversions simultaneously.

How to Convert

Enter a numeric value, select the source unit, and choose the target unit. The result appears instantly. For example, entering 5 feet converts to 60 inches, 1.524 meters, 152.4 centimeters, and 1,524 millimeters. You can also see all conversions at once in the comprehensive table view.

Key Conversion Factors

1 inch = 2.54 centimeters (exact). 1 foot = 12 inches = 30.48 cm. 1 yard = 3 feet = 0.9144 meters. 1 mile = 5,280 feet = 1.60934 km. 1 meter = 100 cm = 39.3701 inches. 1 kilometer = 1,000 meters = 0.62137 miles. These relationships form the foundation of all length conversions.

Common Conversions

Height conversions are among the most frequent: 5 foot 10 inches = 177.8 cm. Travelers often convert kilometers to miles: 100 km ≈ 62 miles. Construction workers convert between feet and meters regularly. Scientists work primarily in metric, while many trades in the U.S. use imperial measurements.

Metric vs. Imperial

Most countries use the metric system (SI units), which is based on powers of 10: 10 mm = 1 cm, 100 cm = 1 m, 1000 m = 1 km. The imperial system used in the U.S. has less intuitive relationships: 12 inches = 1 foot, 3 feet = 1 yard, 5,280 feet = 1 mile.

Frequently Asked Questions

Q: How do I convert height from feet and inches to centimeters?

A: First convert to inches only (feet × 12 + inches), then multiply by 2.54. For 5 ft 8 in: (5 × 12 + 8) = 68 inches × 2.54 = 172.72 cm. The converter handles this automatically when you enter the combined measurement.

Q: What is the difference between a mile and a nautical mile?

A: A statute mile is 5,280 feet (1.609 km), used for land distances. A nautical mile is 6,076 feet (1.852 km), used in aviation and maritime navigation. One nautical mile equals one minute of latitude.

Q: Why does the U.S. still use the imperial system?

A: The U.S. is one of only three countries that have not officially adopted the metric system. While metric is used in science and medicine, the imperial system persists in everyday life due to the high cost of transitioning infrastructure, manufacturing standards, and public familiarity.