Length Converter
Convert between metres, kilometres, feet, inches, miles, yards, and more length units instantly.
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How to use this calculator
- 1
Type the number you want to convert in the "From" field.
- 2
Select the unit you are converting from using the dropdown below the first field.
- 3
Select the unit you want to convert to using the second dropdown.
- 4
The result updates instantly. Use the swap button (⇄) to reverse the conversion.
Frequently asked questions
How many centimetres are in an inch?
There are exactly 2.54 centimetres in one inch. This is the defined conversion factor used internationally.
How do I convert metres to feet?
Multiply the number of metres by 3.28084. For example, 5 metres = 5 × 3.28084 = 16.4042 feet.
What is the difference between a nautical mile and a regular mile?
A nautical mile is 1,852 metres (about 1.151 standard miles). It is used in aviation and maritime navigation and is based on one minute of arc of latitude.
How many feet are in a mile?
There are exactly 5,280 feet in one mile. This is a fixed definition in the US customary and imperial measurement systems.
What is a light year in kilometres?
One light year is approximately 9.461 × 10¹² kilometres (about 9.461 trillion km). It is the distance light travels in a vacuum in one year.
Length and distance conversion
The metric and imperial systems
Most of the world uses the metric system, where the base unit of length is the metre. The imperial system, used primarily in the United States, relies on inches, feet, yards, and miles. The exact relationship between them is defined: 1 inch = 2.54 cm. All other conversions (feet, miles, etc.) follow from this single definition.
Common length conversions at a glance
1 km = 0.621371 miles | 1 mile = 1.60934 km | 1 m = 3.28084 ft | 1 foot = 0.3048 m | 1 inch = 2.54 cm | 1 cm = 0.393701 inches | 1 yard = 0.9144 m | 1 nautical mile = 1.852 km.
When do you need length conversions?
Length conversions come up in construction and home improvement (blueprints in feet, materials in metres), international travel (road signs in km vs miles), science and engineering (working across SI and imperial specs), fitness tracking (running distances in miles or km), and online shopping (clothing sizes listed in cm vs inches).
Learn more from an authoritative source:
NISTInches to Feet Converter
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →