Length Converter
Convert between Metric and Imperial length units (km, m, miles, feet, inches).
Distance and length are the most common measurements in daily life. Whether you are buying lumber (feet), driving (miles/kilometers), or designing a microchip (nanometers), this tool converts all units instantly. It serves as a bridge between the Imperial System (US, Liberia, Myanmar) and the Metric System (Rest of the World).
Length Conversion
Convert length conversion instantly.
Common Conversions
- 1 inch = 2.54 cm
- 1 foot = 12 inches
- 1 yard = 3 feet (0.9144 m)
- 1 mile = 1.609 km (5280 feet)
- 10 km ≈ 6.2 miles
- 1 meter ≈ 3.28 feet
Frequently Asked Questions
Measurement Facts
1. The Definition of a Meter
Originally defined as 1/10,000,000th of the distance from the Equator to the North Pole. Today, it is defined by the speed of light: the distance light travels in vacuum in 1/299,792,458 of a second.
2. Why does the US use Feet?
The "Foot" was originally based on the actual human foot size. King Henry I of England reportedly standardized the "Yard" as the distance from his nose to his thumb. These anthropomorphic units persist in the US for construction and daily use because they are relatable human scales.