Length Converter

Convert any length or distance between metric, imperial, nautical and astronomical units. Enter a value, pick the two units and the result appears instantly.

How to use the Length Converter

  1. Type the value you want to convert in the first box.
  2. Choose the unit you are converting from and the unit you want to convert to.
  3. Read the result instantly. Use the swap button to reverse the direction, or copy the result with one click.

Popular length conversions

ConversionResultFormula
Centimeters to inches1 cm = 0.393701 ininches = centimeters ÷ 2.54
Inches to centimeters1 in = 2.54 cmcentimeters = inches × 2.54
Meters to feet1 m = 3.28084 ftfeet = meters × 3.2808399
Feet to meters1 ft = 0.3048 mmeters = feet × 0.3048
Kilometers to miles1 km = 0.621371 mimiles = kilometers × 0.62137119
Miles to kilometers1 mi = 1.60934 kmkilometers = miles × 1.609344
Millimeters to inches1 mm = 0.0393701 ininches = millimeters ÷ 25.4
Inches to millimeters1 in = 25.4 mmmillimeters = inches × 25.4
Feet to inches1 ft = 12 ininches = feet × 12
Inches to feet1 in = 0.0833333 ftfeet = inches ÷ 12
Centimeters to feet1 cm = 0.0328084 ftfeet = centimeters ÷ 30.48
Feet to centimeters1 ft = 30.48 cmcentimeters = feet × 30.48
Meters to yards1 m = 1.09361 ydyards = meters × 1.0936133
Yards to meters1 yd = 0.9144 mmeters = yards × 0.9144
Meters to centimeters1 m = 100 cmcentimeters = meters × 100
Centimeters to meters1 cm = 0.01 mmeters = centimeters ÷ 100
Millimeters to centimeters1 mm = 0.1 cmcentimeters = millimeters ÷ 10
Centimeters to millimeters1 cm = 10 mmmillimeters = centimeters × 10
Miles to feet1 mi = 5,280 ftfeet = miles × 5,280
Feet to miles1 ft = 0.000189394 mimiles = feet ÷ 5,280
Meters to inches1 m = 39.3701 ininches = meters × 39.370079
Inches to meters1 in = 0.0254 mmeters = inches × 0.0254
Nautical miles to kilometers1 nmi = 1.852 kmkilometers = nautical miles × 1.852
Kilometers to nautical miles1 km = 0.539957 nminautical miles = kilometers ÷ 1.852
Yards to feet1 yd = 3 ftfeet = yards × 3
Feet to yards1 ft = 0.333333 ydyards = feet ÷ 3
Meters to kilometers1 m = 0.001 kmkilometers = meters ÷ 1,000
Kilometers to meters1 km = 1,000 mmeters = kilometers × 1,000

Supported length units

UnitSymbolEqual to
Meterm1 m
Kilometerkm1,000 m
Centimetercm0.01 m
Millimetermm0.001 m
Micrometerµm0.000001 m
Nanometernm0.000000001 m
Decimeterdm0.1 m
Inchin0.0254 m
Footft0.3048 m
Yardyd0.9144 m
Milemi1,609.344 m
Nautical milenmi1,852 m
Fathomftm1.8288 m
Furlongfur201.168 m
Chainch20.1168 m
Rodrd5.0292 m
Leaguelea4,828.032 m
Handhh0.1016 m
Thou (mil)thou0.0000254 m
AngstromÅ1 × 10-10 m
Astronomical unitAU149,597,870,700 m
Light-yearly9.4607 × 1015 m
Parsecpc3.0857 × 1016 m

Metric and imperial length units

The metric system builds every length unit from the meter in steps of ten: 10 millimeters make a centimeter, 100 centimeters make a meter and 1,000 meters make a kilometer. Imperial and US customary units use fixed but irregular ratios: 12 inches in a foot, 3 feet in a yard and 5,280 feet in a mile.

Since 1959 the inch has been defined as exactly 2.54 centimeters, so conversions between the two systems are exact, not approximate. A foot is exactly 0.3048 m and a mile is exactly 1,609.344 m.

Quick mental conversions

  • 1 inch is about 2.5 cm; 4 inches is about 10 cm.
  • 1 meter is a little more than 3 feet 3 inches.
  • 1 kilometer is about 0.62 miles; 8 km is close to 5 miles.

Frequently asked questions

How many centimeters are in an inch?

One inch is exactly 2.54 centimeters. To convert inches to centimeters multiply by 2.54; to convert centimeters to inches divide by 2.54.

How many feet are in a meter?

One meter equals about 3.28084 feet. One foot is exactly 0.3048 meters.

How many kilometers are in a mile?

One mile is exactly 1.609344 kilometers, and one kilometer is about 0.621371 miles.

What is the difference between a mile and a nautical mile?

A statute mile is 1,609.344 m. A nautical mile is 1,852 m and is based on one minute of latitude, which is why it is used at sea and in aviation.

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