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Length Converter

Free web tool: Length Converter

Conversion Result

3.280839895 Feet

Full Conversion Table

Millimeter (mm)

1,000

Centimeter (cm)

100

Meter (m)

1

Kilometer (km)

0.001

Inch (in)

39.37007874

Feet (ft)

3.280839895

Yard (yd)

1.093613298

Mile (mi)

0.0006213711922

Nautical mile (nmi)

0.0005399568035

Chi (尺)

3.300330033

About Length Converter

The Length Converter is a free, browser-based tool that instantly converts a value from any of 10 supported length units to all other units simultaneously. The supported units span the metric system (millimeter, centimeter, meter, kilometer), the imperial and US customary systems (inch, feet, yard, mile), navigation (nautical mile), and the traditional East Asian unit chi (尺, approximately 0.303 m). All conversions use meter as the internal base unit, applying precise conversion factors for maximum accuracy.

Scientists, engineers, construction professionals, students, and travelers all encounter the need to convert between metric and imperial length units. This tool covers the complete set of everyday length units in one place. Enter a value once and see all conversions simultaneously in the full conversion table at the bottom of the page. The source unit is highlighted in blue for easy reference. A Swap Units button instantly exchanges the From and To units without retyping any values.

All computation is performed entirely within your browser using JavaScript. There is no server request, no account required, and no network activity after the page loads. The converter uses up to 10 significant figures for intermediate calculations and applies locale-aware number formatting for large values, ensuring accurate results from nanometer-scale to intercontinental distances.

Key Features

  • Converts between 10 length units: mm, cm, m, km, inch, feet, yard, mile, nautical mile, and chi (尺)
  • Full conversion table showing all 10 unit conversions simultaneously for the entered value
  • Primary conversion display: selected From/To pair shown prominently with the result
  • Swap Units button to instantly reverse the From and To unit selection
  • Meter as internal base unit with precise conversion factors (e.g. 1 nautical mile = 1852 m, 1 inch = 0.0254 m)
  • Up to 10 significant figures of precision with trailing zero trimming for clean display
  • Source unit highlighted in blue in the full conversion table for easy visual reference
  • Dark mode support and responsive grid layout for desktop, tablet, and mobile

Frequently Asked Questions

What length units does this converter support?

The converter supports millimeter (mm), centimeter (cm), meter (m), kilometer (km), inch (in), feet (ft), yard (yd), mile (mi), nautical mile (nmi), and chi/尺 (a traditional East Asian unit equal to approximately 0.303 m) — 10 units in total.

How many feet are in a meter?

One meter equals approximately 3.28084 feet. Conversely, one foot equals exactly 0.3048 meters. Enter 1 in the value field with the From unit set to meters and From set to feet to see the precise result.

What is a nautical mile and how does it differ from a statute mile?

A nautical mile (nmi) is a unit of distance used in aviation and maritime navigation, equal to exactly 1852 meters (approximately 1.151 statute miles). It is based on the length of one arc-minute of latitude along the Earth's meridian. A statute (land) mile is 1609.344 meters.

What is the chi (尺) unit?

Chi (尺) is a traditional East Asian unit of length. The modern standardized value used in this converter is 0.303 meters (approximately 30.3 cm). It is still used in some East Asian contexts for measuring fabric, traditional architecture, and clothing.

How do I convert kilometers to miles?

Select kilometers (km) as the From unit and miles (mi) as the To unit, then enter your value. For example, 1 km = 0.621371 miles. The conversion factor is 1 km = 1000/1609.344 mi.

How accurate are the conversions?

All conversions use the exact SI-defined conversion factors where available (e.g. 1 inch = 0.0254 m exactly, 1 foot = 0.3048 m exactly, 1 nautical mile = 1852 m exactly). Results are displayed to up to 10 significant figures, which is well within the precision needed for engineering and scientific applications.

Can I use the swap button to reverse conversion direction?

Yes. The Swap Units button instantly exchanges the From and To dropdown selections, so if you were converting meters to feet you immediately switch to converting feet to meters using the same numerical value. This saves time when you need bidirectional conversions.

How many inches are in a foot, and how many feet are in a yard?

There are exactly 12 inches in one foot, and exactly 3 feet (36 inches) in one yard. These are exact definitions under the international yard and pound agreement. The converter uses these exact values: 1 inch = 0.0254 m, 1 foot = 0.3048 m, 1 yard = 0.9144 m.