📏 Length & Distance Converter

Convert between metric and imperial length units — millimeters, centimeters, meters, kilometers, inches, feet, yards and miles. All conversions use exact internationally agreed factors (1 inch = 25.4 mm exactly, since 1959).

From

1 mm = 0.1 cm

Precision

1 millimeters = 0.1 centimeters

1 × 0.1 = 0.1

1 mm equals 0.1 cm, so multiplying by 0.1 converts the value. The result describes the exact same quantity — only the measuring stick changes.

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All length & distance units

Unit	Symbol	Definition
Millimeter	mm	A millimeter (mm) is one thousandth of a meter, the SI base unit of length. It is commonly used for small measurements such as paper thickness, screw sizes and rainfall.
Centimeter	cm	A centimeter (cm) is one hundredth of a meter. It is the everyday metric unit for body measurements, clothing sizes and small objects; 2.54 cm equal exactly 1 inch.
Meter	m	The meter (m) is the SI base unit of length, defined by the distance light travels in a vacuum in 1/299,792,458 of a second. It underpins every other length unit in the metric system.
Kilometer	km	A kilometer (km) is 1,000 meters. It is the standard unit for road distances and geographic measurements in most countries; 1 km equals about 0.621 miles.
Inch	in	An inch (in) is an imperial and US customary unit defined as exactly 25.4 millimeters since 1959. Twelve inches make one foot; screens, wheels and paper sizes are commonly measured in inches.
Foot	ft	A foot (ft) is an imperial and US customary unit equal to 12 inches or exactly 0.3048 meters. It is widely used for human height, room dimensions and altitude.
Yard	yd	A yard (yd) equals 3 feet or exactly 0.9144 meters. It is used for fabric, sports fields (notably American football) and landscaping measurements.
Mile	mi	A mile (mi) is an imperial unit equal to 5,280 feet or exactly 1,609.344 meters. It remains the standard road-distance unit in the United States and the United Kingdom.
Nautical mile	nmi	A nautical mile (nmi) is exactly 1,852 meters, historically one minute of latitude. It is the standard distance unit in aviation and marine navigation; one knot is one nautical mile per hour.
Micrometer	µm	A micrometer (µm), also called a micron, is one millionth of a meter. It is used for cell sizes, fine particles and semiconductor manufacturing dimensions.