Millimeter
A metric unit equal to one thousandth of a meter.
Length Conversion Directory
Browse a dedicated formula, worked example, table, and converter for every direction between eight widely used metric and imperial length units.
Open the full 20-unit Length ConverterMetric
Millimeter conversions
Convert from millimeters (mm) to seven core length units.
Metric
Centimeter conversions
Convert from centimeters (cm) to seven core length units.
Metric
Meter conversions
Convert from meters (m) to seven core length units.
Metric
Kilometer conversions
Convert from kilometers (km) to seven core length units.
Imperial
Inch conversions
Convert from inches (in) to seven core length units.
Imperial
Foot conversions
Convert from feet (ft) to seven core length units.
Imperial
Yard conversions
Convert from yards (yd) to seven core length units.
Imperial
Mile conversions
Convert from miles (mi) to seven core length units.
Popular length conversions
Start with commonly used metric, imperial, and cross-system directions.
Length unit definitions
The eight core units cover practical scales from small manufactured dimensions to road and geographic distances.
Centimeter
A metric unit equal to one hundredth of a meter.
Meter
The SI base unit of length, defined using the speed of light in vacuum.
Kilometer
A metric unit equal to exactly 1,000 meters.
Inch
An imperial and US customary unit defined as exactly 25.4 millimeters.
Foot
An imperial and US customary unit equal to exactly 0.3048 meter or 12 inches.
Yard
An imperial and US customary unit equal to exactly 0.9144 meter or 3 feet.
Mile
A statute mile equal to exactly 1,609.344 meters or 5,280 feet.
Frequently asked questions
Which length conversion pages are included?
The directory includes every direction between eight core units: millimeter, centimeter, meter, kilometer, inch, foot, yard, and mile.
Why are there 56 conversion pages?
Each of the eight source units can convert to seven different target units, producing 8 × 7 = 56 directional pages.
Can I convert other length units?
Yes. The full Length Converter supports 20 units, including nautical and scientific measurements. Those combinations remain available in the general tool.
Are metric and imperial conversions exact?
Core unit definitions are exact. A displayed decimal can still be rounded when the exact ratio has a non-terminating decimal expansion.
Why does each direction have its own page?
A focused page keeps the default units, formula direction, examples, table, questions, and related links aligned with one specific task.
Methodology and sources
Every conversion uses the meter as a shared baseline. Metric units follow decimal prefixes, while inches, feet, yards, and miles use their exact international definitions relative to the meter.