Length Converter
Our Length Converter instantly converts between all common length and distance units — metric, imperial, nautical, and astronomical. Enter a value in any unit and instantly see the equivalent in every other unit simultaneously. This eliminates manual calculations and the risk of conversion errors in engineering, construction, science, travel, and everyday measurements.
The tool covers units from nanometers (billionths of a meter, used in nanosecond-scale electronics) to light-years (distances in astronomy), with the full range of practical everyday units in between. All conversions use precise decimal conversion factors and display up to 10 significant figures.
Supported Length Units
- Metric: nanometer, micrometer, millimeter, centimeter, decimeter, meter, kilometer.
- Imperial/US: inch, foot, yard, mile, nautical mile.
- Astronomical: light-year, astronomical unit (AU), parsec.
- Typographic: point, pica, em.
- Historical: cubit, furlong, fathom, league.
- All units displayed simultaneously — enter one value, see all conversions at once.
How to Convert Length Units
- Enter the length value you want to convert.
- Select the source unit from the dropdown (or just start typing in any unit's field).
- All equivalent values in other units are displayed instantly.
- Copy any individual result by clicking the copy icon next to it.
Essential Length Conversion Reference
1 inch = 2.54 centimeters. 1 foot = 0.3048 meters = 12 inches. 1 yard = 0.9144 meters = 3 feet. 1 mile = 1.60934 kilometers = 5,280 feet. 1 nautical mile = 1.852 kilometers. 1 meter = 3.28084 feet = 39.3701 inches. 1 kilometer = 0.621371 miles. These conversions are used daily by engineers, architects, travellers, and students worldwide.
Frequently Asked Questions
What is the difference between mile and nautical mile?
A standard (statute) mile is 1,609.34 meters. A nautical mile is 1,852 meters, based on one minute of latitude on Earth's surface. Nautical miles are used in aviation and navigation.
How many centimeters in an inch?
Exactly 2.54 centimeters in one inch. This is an exact definition — the inch is defined in terms of the meter.
How do I convert feet and inches to meters?
Convert feet to inches (multiply by 12), add the remaining inches, then multiply the total inches by 0.0254. Example: 5'11" = (5×12)+11 = 71 inches × 0.0254 = 1.8034 meters.
What is an astronomical unit (AU)?
One AU is the average distance from Earth to the Sun: approximately 149.6 million kilometers (93 million miles). It's used to express distances within our solar system.
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