Length Converter: mm, cm, m, km, miles
Convert length units instantly — millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
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Length Converter: mm, cm, m, km, miles Length is the most commonly converted physical quantity. A carpenter reads plans in millimeters and builds in feet and inches; a runner trains in kilometers but races in miles; a sailor plots courses in nautical miles. Converting accurately and quickly — without mental arithmetic — is a practical skill across dozens of fields. --- What is the metric ladder? The metric system uses prefixes based on powers of 10. Every step up or down the ladder multiplies or divides by 10, 100, or 1,000: | Unit | Symbol | Relation to metre | |---|---|---| | Nanometre | nm | 0.000000001 m | | Micrometre (micron) | µm | 0.000001 m | | Millimetre | mm | 0.001 m | | Centimetre | cm | 0.01 m | | Decimetre | dm | 0.1 m | | Metre | m | 1 m | | Kilometre | km | 1,000 m | |…
Frequently Asked Questions
How do I convert meters to feet?
Multiply the number of meters by 3.28084. For example, 5 meters × 3.28084 = 16.4042 feet. The inverse is also useful: 1 foot = 0.3048 meters exactly (this is the defined relationship since 1959).
What is the formula for km to miles?
Multiply kilometers by 0.621371. So 10 km × 0.621371 = 6.21371 miles. A handy approximation for road distances: multiply km by 0.6, which gives a slight underestimate useful for mental math.
How many inches in a foot?
Exactly 12 inches. This definition is fixed: 1 international inch = exactly 25.4 mm, and 1 international foot = exactly 12 × 25.4 mm = 304.8 mm = 0.3048 m.
What is a nautical mile?
A nautical mile is 1,852 meters (1.852 km or 1.15078 statute miles). It was originally defined as one minute of arc along a meridian of the Earth — making it a natural unit for navigation. Speed at sea and in the air is measured in knots, where 1 knot = 1 nautical mile per hour.
How do I convert centimeters to inches?
Divide centimeters by 2.54. For example, 30 cm ÷ 2.54 = 11.811 inches. This works because 1 inch is defined as exactly 2.54 centimeters — the exact definition adopted internationally in 1959.
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