Length Converter
Convert between metres, kilometres, miles, feet, inches, yards, nautical miles, light-years, angstroms, and more — all length and distance units in one place.
All Unit ConvertersAll conversions from 1 metre
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Length and Distance Units Explained
The metre (m) is the SI base unit of length. All other metric length units are powers of 10 multiples or fractions of it. The imperial and US customary systems use inches, feet, yards, and miles.
One inch is exactly 25.4 mm by international definition since 1959. One mile is 5280 feet = 1609.344 metres exactly. The nautical mile (1852 m) is used in aviation and maritime navigation, defined as one arcminute of latitude.
Metric (SI)
Nanometre → millimetre → centimetre → metre → kilometre — each a factor of 10.
Imperial / US
Inch (2.54 cm), foot (30.48 cm), yard (91.44 cm), mile (1609.344 m).
Navigation
Nautical mile (1852 m) = 1 arcminute of latitude. Fathom (1.8288 m) used for ocean depth.
Astronomical
AU (Earth–Sun distance ≈ 150M km), light-year (≈ 9.46 × 10¹⁵ m), parsec (≈ 3.086 × 10¹⁶ m).
Common Questions
FAQ: Length Converter
One metre equals exactly 3.28084 feet. Equivalently, 1 foot = 0.3048 metres (exact, by international definition). This means 1 metre is about 3 feet 3⅜ inches.
One mile equals exactly 1.609344 kilometres. A quick approximation: multiply miles by 1.6 to get kilometres, or multiply kilometres by 0.621 to get miles.
One centimetre = 0.393701 inches (about 0.4 inches). One inch = 2.54 cm exactly. This is the exact international definition established in 1959.
A nautical mile equals exactly 1852 metres (1.852 km or about 1.15078 statute miles). It is defined as one arcminute of latitude on Earth’s surface, making it naturally useful for navigation. Speed in nautical miles per hour is called a knot.