Length Converter

Length measurement is one of the most fundamental needs in science, engineering, construction, and everyday life. Different regions and disciplines use different unit systems, making a reliable converter essential. This tool supports both the metric system (SI) and the imperial/US customary system.

The metric system — based on powers of 10 — is the international standard. The meter (m) is the SI base unit. From there, the kilometer (1,000 m), centimeter (0.01 m), millimeter (0.001 m), micrometer (0.000001 m), and nanometer (0.000000001 m) are derived by simple scale factors.

The imperial system — used primarily in the United States and the United Kingdom — uses inches, feet, yards, and miles. These are exact: 1 inch = 25.4 mm, 1 foot = 12 inches, 1 yard = 3 feet, and 1 mile = 5,280 feet = 1,609.344 meters.

Common use cases include: converting running distances between kilometers and miles, construction measurements between feet and meters, fabric measurements between inches and centimeters, and scientific work with nanometers or micrometers. This converter handles all of them with precision up to 10 significant figures.

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