Length & Distance Units

International System of Units (SI)

The basic unit of measurement of the distance in the metric system of SI measurements is the meter [m].

In metrological measurements and automation, the derived units are also used.

• Kilometer [km] = 1000 m.
• The decimeter [dm] = 0.1 m.
• Centimeter [cm] = 0.01 m.
• Millimeter [mm] = 0.001 m.
• Micrometer (micron) [μm] = 0.001 mm.
• Nanometer [nm] = 0.001 μm.
• Angstrom [A] = 0.1 nm.

Imperial and Customary units

• 1 League [lea] = 3 miles = 24 Furlongs = 4828.032 m.
• 1 mile [mi] = 8 furlongs = 1760 yards = 5280 feet = 1609344 m.
• 1 Furlong [fur] = 1/8 mi = 10 chains = 220 yards = 40 rods = 660 ft = 1000 links = 201.168 m.
• 1 Chain [ch] = 100 links = 1/10 furlong = 4 rods = 66 feet = 20.1168 m.
• 1 Rod [rd] = 25 links = 5.5 yards = 1/40 furlongs = 5.0292 m.
• 1 Yard [yd] = 3 feet = 36 inches = 0.9144 m.
• 1 foot [ft] = 12 inches = 0.3048 m.
• 1 Span [sp] = 3 Palm = 9 inches = 0.2286 m.
• 1 Hand [hd] = 4 inches = 0.1016 m.
• 1 Inch [in] = 0.0254 m
• 1 Line [ln] = 1/12 in = 0.0021666666666 m.
• 1 Caliber [cl] = 0.01 inches = 0.000254 m.

International Maritime Units

• 1 Sea League [nl] = 3 miles = 5556.0 m.
• 1 Nautical mile [nmi] = 1852.0 m.
• 1 Cable = 0.1 nautical mile = 185.2 m.
• 1 Fathom [ftm] = 6 feet = 1.8288 m.

US Maritime Units

• 1 Nautical mile of the USA [nmi] = 1853.248 m (before 1955).

British Navy Units

• 1 Nautical mile of Britain [nmi] = 1853.1848 m (before 1970).