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Length Conversion Calculator

Convert any distance or length across millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles. All calculations u

Conversions
Distance or length to convert.
Starting unit of length.
Target unit of length.
Formula & Methodology
Target Length = Starting Length × (Factor_From ÷ Factor_To)

Length conversions convert the input value into base SI meters using exact defined multipliers (e.g., 0.0254 m per inch, 0.3048 m per foot, 1609.344 m per mile). The intermediate meter value is then divided by the target unit factor. Selecting identical from/to units returns the input value unchanged.

Feet Result

32.808399 ft

Overview

Convert any distance or length across millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles. All calculations use exact international conversion constants established under the 1959 International Yard and Pound Agreement, where 1 inch is defined as exactly 2.54 centimeters.

Worked Examples

Convert 10 Meters to Feet

Input 10 m converted to ft.

  1. 1 meter = 1.0 m base.
  2. Target foot factor = 0.3048 m.
  3. Compute: 10 m ÷ 0.3048 m/ft = 32.808399 ft.
Final Answer: 32.808399 ft

Convert 1 Mile to Kilometers

Input 1 mile converted to km.

  1. 1 international mile = 1609.344 m exactly.
  2. 1 kilometer = 1000 m.
  3. Compute: 1609.344 ÷ 1000 = 1.609344 km exactly.
Final Answer: 1.609344 km

Convert 50 Inches to Centimeters

Input 50 in converted to cm.

  1. 1 inch = 2.54 cm exactly.
  2. Compute: 50 × 2.54 = 127.0 cm exactly.
Final Answer: 127.0 cm

How to Use This Calculator

  1. Enter the length or distance measurement into the value field.
  2. Select the source unit in the "From Unit" dropdown.
  3. Select the desired destination unit in the "To Unit" dropdown.
  4. Read the exact converted length along with the SI meter baseline and conversion ratio.

Reference Table

UnitSymbolLength in MetersLength in Inches
Millimetermm0.001 m0.039370 in
Centimetercm0.01 m0.393701 in
Meterm1.0 m39.370079 in
Kilometerkm1000.0 m39,370.0787 in
Inchin0.0254 m1.0 in (exact)
Footft0.3048 m12.0 in (exact)
Yardyd0.9144 m36.0 in (exact)
Statute Milemi1609.344 m63,360.0 in (exact)
Nautical Milenmi1852.0 m72,913.386 in

Frequently Asked Questions

Are there exactly 2.54 centimeters in an inch?
Yes. Under the 1959 International Yard and Pound Agreement adopted by the United States, United Kingdom, Canada, Australia, New Zealand, and South Africa, the international inch was legally defined as exactly 25.4 millimeters (2.54 cm).
What is the difference between a statute mile and a nautical mile?
A standard land (statute) mile is 5,280 feet or 1,609.344 meters. A nautical mile is defined as exactly 1,852 meters (approx. 6,076.12 feet), historically derived from one minute of arc along a meridian of latitude.
How do I convert decimal feet to feet and inches?
Multiply the decimal portion by 12 to obtain remaining inches. For example, 5.5 feet is 5 whole feet plus (0.5 × 12 = 6) inches, equaling 5 ft 6 in.
What is the US Survey Foot and does it differ from the international foot?
The US Survey Foot was defined as 1200/3937 meters (approx. 0.30480061 m), differing by 2 parts per million. As of January 1, 2023, the National Institute of Standards and Technology (NIST) and NOAA officially deprecated the US survey foot in favor of the international foot (0.3048 m exact).
How many yards are in one statute mile?
There are exactly 1,760 yards in one statute mile (5,280 feet ÷ 3 feet per yard = 1,760 yards).

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Reviewed & Authored by: OnlineConvers Engineering Team · Last Updated: 2026-10-07
Conversions utilize exact constants defined by NIST Special Publication 811 and ISO 80000-3. Base conversions resolve through the international meter (1 in = 0.0254 m; 1 ft = 0.3048 m; 1 mi = 1609.344 m).