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Length converter

Pick any two length units. Every factor is exact by definition, from the 1959 yard (0.9144 m) to the light-year.

2.54

1 in = 2.54 cmcm = in × 2.54 · shown to 6 significant figures

Precision

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Popular conversions

Centimeters to inchesTier 01 centimeter = 0.3937007874 inches. Type in either box; the other updates as you go.Millimeters to inchesTier 01 millimeter = 0.03937007874 inches. Type in either box; the other updates as you go.Inches to centimetersTier 01 inch = 2.54 centimeters exactly. Type in either box; the other updates as you go.Km to milesTier 0Divide by the exact factor 1.609344 to turn kilometres into international miles. Type in either box; the other updates instantly.Meters to feetTier 01 meter = 3.280839895 feet. Type in either box; the other updates as you go.Miles to kmTier 0Exact conversion by the international definition: 1 mile = 1.609344 km. Type in either box; the other updates as you go.Feet to metersTier 01 foot = 0.3048 meters exactly. Type in either box; the other updates as you go.Inches to millimetersTier 01 inch = 25.4 millimeters exactly. Type in either box; the other updates as you go.Centimeters to feetTier 01 centimeter = 0.03280839895 feet. Type in either box; the other updates as you go.Inches to feetTier 01 inch = 0.08333333333 feet. Type in either box; the other updates as you go.Centimeters to millimetersTier 01 centimeter = 10 millimeters exactly. Type in either box; the other updates as you go.Millimeters to centimetersTier 01 millimeter = 0.1 centimeters exactly. Type in either box; the other updates as you go.Centimeters to metersTier 01 centimeter = 0.01 meters exactly. Type in either box; the other updates as you go.Feet to inchesTier 01 foot = 12 inches exactly. Type in either box; the other updates as you go.Feet to milesTier 01 foot = 0.0001893939394 miles. Type in either box; the other updates as you go.Meters to centimetersTier 01 meter = 100 centimeters exactly. Type in either box; the other updates as you go.Feet to centimetersTier 01 foot = 30.48 centimeters exactly. Type in either box; the other updates as you go.Meters to yardsTier 01 meter = 1.093613298 yards. Type in either box; the other updates as you go.Miles to feetTier 01 mile = 5,280 feet exactly. Type in either box; the other updates as you go.Yards to metersTier 01 yard = 0.9144 meters exactly. Type in either box; the other updates as you go.Nautical miles to milesTier 01 nautical mile = 1.150779448 miles. Type in either box; the other updates as you go.Light-years to milesTier 01 light-year = 5,878,625,373,000 miles. Type in either box; the other updates as you go.Micrometers to millimetersTier 01 micrometer = 0.001 millimeters exactly. Type in either box; the other updates as you go.

Length is the most converted quantity there is: recipes, furniture, screens, tires, running routes and building plans all mix metric and US or imperial units. Since 1959 the inch, foot, yard and mile have been defined from the meter (1 in = 25.4 mm exactly), so every conversion on this page is an exact multiplication with no measured constant involved.

Use the converter above for any pair, including rare ones such as nanometers to inches. The most searched pairs also have their own pages with worked examples, a reference table and mental-math tips; they are listed above.