Length Converter
Convert distance and length measurements between Metric, US Customary, and Imperial systems. Convert between metric, US customary, and imperial units using documented conversion factors and high-precision decimal calculations.
Live Interactive Calculator
kilometer = meter ÷ 1000Popular Length Conversions
Explore dedicated guides with exact formulas, conversion factors, worked calculation steps, and quick reference tables.
Yards to Inches
Convert Yard to Inch with exact formula and quick lookup tables.
Yards to Feet
Convert Yard to Foot with exact formula and quick lookup tables.
Yards to Meters
Convert Yard to Meter with exact formula and quick lookup tables.
Yards to Centimeters
Convert Yard to Centimeter with exact formula and quick lookup tables.
Feet to Inches
Convert Foot to Inch with exact formula and quick lookup tables.
Feet to Yards
Convert Foot to Yard with exact formula and quick lookup tables.
Inches to Feet
Convert Inch to Foot with exact formula and quick lookup tables.
Inches to Yards
Convert Inch to Yard with exact formula and quick lookup tables.
Meters to Feet
Convert Meter to Foot with exact formula and quick lookup tables.
Feet to Meters
Convert Foot to Meter with exact formula and quick lookup tables.
Miles to Kilometers
Convert Mile to Kilometer with exact formula and quick lookup tables.
Kilometers to Miles
Convert Kilometer to Mile with exact formula and quick lookup tables.
Centimeters to Inches
Convert Centimeter to Inch with exact formula and quick lookup tables.
Inches to Centimeters
Convert Inch to Centimeter with exact formula and quick lookup tables.
Miles to Feet
Convert Mile to Foot with exact formula and quick lookup tables.
Feet to Miles
Convert Foot to Mile with exact formula and quick lookup tables.
Millimeters to Inches
Convert Millimeter to Inch with exact formula and quick lookup tables.
Inches to Millimeters
Convert Inch to Millimeter with exact formula and quick lookup tables.
Major Length Units & Definitions
Standard measurement units, measurement systems, and documented sources.
Meter
mThe meter is the SI base unit of length. Officially redefined in 1983 by the CGPM as the distance traveled by light in a vacuum in 1/299,792,458 of a second.
Kilometer
kmA metric unit equal to 1,000 meters. Commonly used worldwide for geographical distances and transportation speed limits.
Centimeter
cmA decimal fraction of the meter, equal to one-hundredth of a meter (0.01 m). Commonly used for everyday dimensions and human height.
Millimeter
mmA metric unit of length equal to one-thousandth of a meter (0.001 m). Extensively used in precision mechanical engineering and architecture blueprints.
Yard
ydAn English and US customary unit of length equal to 3 feet or 36 inches. Officially defined as exactly 0.9144 meters under the 1959 International Yard and Pound Agreement.
Foot
ftA unit of length in the imperial and US customary systems of measurement, equal to 12 inches or 1/3 yard. Defined as exactly 0.3048 meters.
Inch
inA customary unit of length equal to 1/12 of a foot or 1/36 of a yard. Defined as exactly 25.4 millimeters (0.0254 meters).
Mile
miThe statute mile is a US customary and British imperial unit equal to 5,280 feet or 1,760 yards. Exactly 1,609.344 meters.
Nautical Mile
nmiA non-SI unit of distance used in marine and air navigation, defined internationally in 1929 as exactly 1,852 meters (approximately one minute of latitude arc).