Length Converter

Convert between all common metric and imperial length units including meters, kilometers, feet, inches, miles, yards, nautical miles, and light years.

Length Converter 12 units

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Common Length Conversions

All Length Conversions

Browse all unit combinations — each page has a dedicated converter and conversion table.

Meters → Kilometers Meters → Centimeters Meters → Millimeters Meters → Micrometers Meters → Nanometers Meters → Miles Meters → Yards Meters → Feet Meters → Inches Meters → Nautical Miles Meters → Light Years Kilometers → Meters Kilometers → Centimeters Kilometers → Millimeters Kilometers → Micrometers Kilometers → Nanometers Kilometers → Miles Kilometers → Yards Kilometers → Feet Kilometers → Inches Kilometers → Nautical Miles Kilometers → Light Years Centimeters → Meters Centimeters → Kilometers Centimeters → Millimeters Centimeters → Micrometers Centimeters → Nanometers Centimeters → Miles Centimeters → Yards Centimeters → Feet Centimeters → Inches Centimeters → Nautical Miles Centimeters → Light Years Millimeters → Meters Millimeters → Kilometers Millimeters → Centimeters Millimeters → Micrometers Millimeters → Nanometers Millimeters → Miles Millimeters → Yards Millimeters → Feet Millimeters → Inches Millimeters → Nautical Miles Millimeters → Light Years Micrometers → Meters Micrometers → Kilometers Micrometers → Centimeters Micrometers → Millimeters Micrometers → Nanometers Micrometers → Miles Micrometers → Yards Micrometers → Feet Micrometers → Inches Micrometers → Nautical Miles Micrometers → Light Years Nanometers → Meters Nanometers → Kilometers Nanometers → Centimeters Nanometers → Millimeters Nanometers → Micrometers Nanometers → Miles Nanometers → Yards Nanometers → Feet Nanometers → Inches Nanometers → Nautical Miles Nanometers → Light Years Miles → Meters Miles → Kilometers Miles → Centimeters Miles → Millimeters Miles → Micrometers Miles → Nanometers Miles → Yards Miles → Feet Miles → Inches Miles → Nautical Miles Miles → Light Years Yards → Meters Yards → Kilometers Yards → Centimeters Yards → Millimeters Yards → Micrometers Yards → Nanometers Yards → Miles Yards → Feet Yards → Inches Yards → Nautical Miles Yards → Light Years Feet → Meters Feet → Kilometers Feet → Centimeters Feet → Millimeters Feet → Micrometers Feet → Nanometers Feet → Miles Feet → Yards Feet → Inches Feet → Nautical Miles Feet → Light Years Inches → Meters Inches → Kilometers Inches → Centimeters Inches → Millimeters Inches → Micrometers Inches → Nanometers Inches → Miles Inches → Yards Inches → Feet Inches → Nautical Miles Inches → Light Years Nautical Miles → Meters Nautical Miles → Kilometers Nautical Miles → Centimeters Nautical Miles → Millimeters Nautical Miles → Micrometers Nautical Miles → Nanometers Nautical Miles → Miles Nautical Miles → Yards Nautical Miles → Feet Nautical Miles → Inches Nautical Miles → Light Years Light Years → Meters Light Years → Kilometers Light Years → Centimeters Light Years → Millimeters Light Years → Micrometers Light Years → Nanometers Light Years → Miles Light Years → Yards Light Years → Feet Light Years → Inches Light Years → Nautical Miles

📐 How to Use

Pick the unit you are starting from in the From dropdown, then type your number into the field below it.
Pick the unit you want in the To dropdown; the result appears as you type, with the factor used shown underneath.
Press the swap button between the two columns to reverse the direction, turning meters to feet into feet to meters, then use Copy to take the result.
Click any card in the Common Length Conversions grid to load a popular pair, or open a pairing from the All Length Conversions list for its own page and conversion table.

❓ Frequently Asked Questions

QHow many centimeters are in an inch?

An inch is exactly 2.54 centimeters, or 25.4 millimeters. That is a definition rather than a measurement: the international yard and pound agreement of 1959 fixed the inch at 25.4 millimeters, so inch to metric conversions on this page carry no rounding error at all.

QWhat is 1 kilometer in miles?

One kilometer is 0.62137119 miles, and one mile is 1.609344 kilometers. The mile figure is exact, since a mile is defined as 1,760 yards of 0.9144 meters each. For mental math, multiply kilometers by 0.6 or miles by 1.6.

QHow many millimeters are in a meter?

A meter is 1,000 millimeters, and also 100 centimeters or 0.001 kilometers. Metric length prefixes are powers of ten, so converting between them moves the decimal point: meters to millimeters shifts it three places right, meters to kilometers three places left.

QIs a nautical mile the same as a mile?

No. A nautical mile is 1,852 meters, about 1.150779 statute miles. It was defined as one minute of latitude along a meridian, which is why ships and aircraft use it, while the statute mile of 1,609.344 meters descends from Roman and English land measure.

ℹ️ About Length Conversion

Length measures the distance between two points, and the units people use for it come from two unconnected traditions. Metric units step by powers of ten, while imperial measure runs 12 inches to a foot, 3 feet to a yard and 1,760 yards to a mile. The two systems were only tied together in 1959, when the inch was fixed at exactly 25.4 millimeters. The traps are the units whose names look alike: a nautical mile is 1,852 meters, one minute of latitude, not the 1,609.344 meters of a statute mile.

Twelve units are covered here, from nanometers to light years. Each conversion runs through the meter: your value is multiplied by the source unit's size in meters, then divided by the target unit's. Displayed results carry eight decimal places below 1, six below 10 and four above that, with trailing zeros dropped. The arithmetic happens in your browser.

📏 12 Supported Units

Meter (m), Kilometer (km), Centimeter (cm), Millimeter (mm), Micrometer (µm), Nanometer (nm), Mile (mi), Yard (yd), Foot (ft), Inch (in), Nautical Mile (nmi), Light Year (ly).