Length Converter — Meters, Feet, Inches, Miles & More
Convert between meters, feet, inches, centimeters, kilometers, miles, nautical miles, and more. Free online length unit converter for construction, travel, and engineering.
Length Converter
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The Formula
Length conversion uses linear scaling factors relative to the meter (the SI base unit). Each unit has a fixed conversion factor to meters. To convert from unit A to unit B, multiply the input value by the ratio of the two factors.
Variable Definitions
Meter
The SI base unit of length. Defined as the distance light travels in a vacuum in 1/299,792,458 of a second. The foundation of the metric system.
Foot
The imperial/US customary unit of length. 1 foot = 12 inches. Originally based on the length of a human foot. The standard unit for US construction and aviation altitude.
Mile & Kilometer
Mile (1,609.344 m): the primary distance unit in the US and UK for road travel. Kilometer (1,000 m): used by the rest of the world for road distances.
Nautical Mile
One nautical mile = 1,852 meters exactly. Defined as one minute of latitude along any meridian. Used in aviation, shipping, and GPS navigation.
How to Use This Calculator
- 1
Enter the length value you want to convert.
- 2
Select the current length unit from the "From" dropdown.
- 3
Select the desired length unit from the "To" dropdown.
- 4
The converted value is displayed instantly with the formula. Use this for construction, travel planning, engineering, or science homework.
Quick Reference
| From | To |
|---|---|
| 1 m | 3.281 ft / 1.094 yd / 39.37 in |
| 1 ft | 30.48 cm / 0.3048 m / 12 in |
| 1 in | 2.54 cm / 25.4 mm |
| 1 mi | 1.609 km / 1,760 yd / 5,280 ft |
| 1 km | 0.621 mi / 1,093.6 yd |
| 1 nmi | 1.852 km / 1.151 mi / 6,076 ft |
| 1 yd | 0.9144 m / 3 ft / 36 in |
| 1 cm | 0.394 in / 10 mm |
Common Applications
- Construction: converting blueprint measurements between imperial and metric for international projects
- Travel: understanding distances in foreign countries that use different measurement systems
- Aviation: altitudes in feet worldwide, but runway lengths in meters in most countries
- Shipping: container dimensions in feet/inches in the US, meters elsewhere
- Manufacturing: precision machining using millimeters (metric) or thousandths of an inch (imperial)
- GPS navigation: coordinates in degrees/minutes/seconds, distances in nautical miles or kilometers
Metric and imperial length units compared visually. The meter is the SI standard; the foot, inch, and yard are US customary units.
Understanding the Concept
Length measurement is one of humanity's oldest quantified concepts, dating back to the cubit (the length of a forearm) in ancient Egypt and Mesopotamia. Today, the world is split between two major systems: the metric system (SI) and the US customary / imperial system. The metric system, established in France in 1795 and now adopted by every country except the United States, Liberia, and Myanmar, is based on the meter — originally defined as 1/10,000,000 of the distance from the equator to the North Pole along the Paris meridian. Today, the meter is defined with extreme precision by the speed of light: exactly 1/299,792,458 of a light-second. The imperial system uses the foot (12 inches), yard (3 feet), and mile (5,280 feet), with origins in Roman and Anglo-Saxon measurement. The inch is now formally defined as exactly 25.4 mm by international agreement (1959). Nautical miles (1,852 m) are used in aviation and maritime navigation because they correspond to one minute of latitude, making map calculations straightforward. Understanding both systems is essential for international trade, engineering, construction, and travel.
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