Length conversions
Length converter for metric and imperial units — meters, kilometers, centimeters, millimeters, miles, feet, inches, yards, nautical miles and scientific units. Conversion factors follow the 1959 international definition (1 inch = 25.4 mm exactly) and NIST reference values.
The base SI unit of length, defined by the speed of light
Meter to Kilometer
1 m = 0.001 km
Meter to Centimeter
1 m = 100 cm
Meter to Millimeter
1 m = 1,000 mm
Meter to Mile
1 m = 0.0006214 mi
Meter to Yard
1 m = 1.09361 yd
Meter to Foot
1 m = 3.28084 ft
Meter to Inch
1 m = 39.3701 in
Meter to Nautical Mile
1 m = 0.00054 nmi
Meter to Micrometer
1 m = 1,000,000 µm
Meter to Nanometer
1 m = 1,000,000,000 nm
Meter to Light Year
1 m = 1.0570e-16 ly
Meter to Furlong
1 m = 0.004971 fur
Meter to Fathom
1 m = 0.5468 ftm
Meter to Angstrom
1 m = 10,000,000,000 Å
The standard road-distance unit in 195 countries worldwide
Kilometer to Meter
1 km = 1,000 m
Kilometer to Centimeter
1 km = 100,000 cm
Kilometer to Millimeter
1 km = 1,000,000 mm
Kilometer to Mile
1 km = 0.6214 mi
Kilometer to Yard
1 km = 1,093.61 yd
Kilometer to Foot
1 km = 3,280.84 ft
Kilometer to Inch
1 km = 39,370.08 in
Kilometer to Nautical Mile
1 km = 0.54 nmi
Kilometer to Micrometer
1 km = 1,000,000,000 µm
Kilometer to Nanometer
1 km = 1,000,000,000,000 nm
Kilometer to Light Year
1 km = 1.0570e-13 ly
Kilometer to Furlong
1 km = 4.97097 fur
Kilometer to Fathom
1 km = 546.807 ftm
Kilometer to Angstrom
1 km = 10,000,000,000,000 Å
The everyday unit for body measurements, clothing and furniture
Centimeter to Meter
1 cm = 0.01 m
Centimeter to Kilometer
1 cm = 1.0000e-5 km
Centimeter to Millimeter
1 cm = 10 mm
Centimeter to Mile
1 cm = 6.2137e-6 mi
Centimeter to Yard
1 cm = 0.01094 yd
Centimeter to Foot
1 cm = 0.03281 ft
Centimeter to Inch
1 cm = 0.3937 in
Centimeter to Nautical Mile
1 cm = 5.3996e-6 nmi
Centimeter to Micrometer
1 cm = 10,000 µm
Centimeter to Nanometer
1 cm = 10,000,000 nm
Centimeter to Light Year
1 cm = 1.0570e-18 ly
Centimeter to Furlong
1 cm = 4.9710e-5 fur
Centimeter to Fathom
1 cm = 0.005468 ftm
Centimeter to Angstrom
1 cm = 100,000,000 Å
Used in precision engineering, manufacturing and rainfall reports
Millimeter to Meter
1 mm = 0.001 m
Millimeter to Kilometer
1 mm = 1.0000e-6 km
Millimeter to Centimeter
1 mm = 0.1 cm
Millimeter to Mile
1 mm = 6.2137e-7 mi
Millimeter to Yard
1 mm = 0.001094 yd
Millimeter to Foot
1 mm = 0.003281 ft
Millimeter to Inch
1 mm = 0.03937 in
Millimeter to Nautical Mile
1 mm = 5.3996e-7 nmi
Millimeter to Micrometer
1 mm = 1,000 µm
Millimeter to Nanometer
1 mm = 1,000,000 nm
Millimeter to Light Year
1 mm = 1.0570e-19 ly
Millimeter to Furlong
1 mm = 4.9710e-6 fur
Millimeter to Fathom
1 mm = 0.0005468 ftm
Millimeter to Angstrom
1 mm = 10,000,000 Å
The official road-distance unit in the US, UK and Myanmar
Mile to Meter
1 mi = 1,609.34 m
Mile to Kilometer
1 mi = 1.60934 km
Mile to Centimeter
1 mi = 160,934.4 cm
Mile to Millimeter
1 mi = 1,609,344 mm
Mile to Yard
1 mi = 1,760 yd
Mile to Foot
1 mi = 5,280 ft
Mile to Inch
1 mi = 63,360 in
Mile to Nautical Mile
1 mi = 0.869 nmi
Mile to Micrometer
1 mi = 1,609,344,000 µm
Mile to Nanometer
1 mi = 1,609,344,000,000 nm
Mile to Light Year
1 mi = 1.7011e-13 ly
Mile to Furlong
1 mi = 8 fur
Mile to Fathom
1 mi = 880 ftm
Mile to Angstrom
1 mi = 16,093,440,000,000 Å
Used in American football, British cricket and Anglo-Saxon textiles
Yard to Meter
1 yd = 0.9144 m
Yard to Kilometer
1 yd = 0.0009144 km
Yard to Centimeter
1 yd = 91.44 cm
Yard to Millimeter
1 yd = 914.4 mm
Yard to Mile
1 yd = 0.0005682 mi
Yard to Foot
1 yd = 3 ft
Yard to Inch
1 yd = 36 in
Yard to Nautical Mile
1 yd = 0.0004937 nmi
Yard to Micrometer
1 yd = 914,400 µm
Yard to Nanometer
1 yd = 914,400,000 nm
Yard to Light Year
1 yd = 9.6652e-17 ly
Yard to Furlong
1 yd = 0.004545 fur
Yard to Fathom
1 yd = 0.5 ftm
Yard to Angstrom
1 yd = 9,144,000,000 Å
The international aviation altitude standard and US building unit
Foot to Meter
1 ft = 0.3048 m
Foot to Kilometer
1 ft = 0.0003048 km
Foot to Centimeter
1 ft = 30.48 cm
Foot to Millimeter
1 ft = 304.8 mm
Foot to Mile
1 ft = 0.0001894 mi
Foot to Yard
1 ft = 0.3333 yd
Foot to Inch
1 ft = 12 in
Foot to Nautical Mile
1 ft = 0.0001646 nmi
Foot to Micrometer
1 ft = 304,800 µm
Foot to Nanometer
1 ft = 304,800,000 nm
Foot to Light Year
1 ft = 3.2217e-17 ly
Foot to Furlong
1 ft = 0.001515 fur
Foot to Fathom
1 ft = 0.1667 ftm
Foot to Angstrom
1 ft = 3,048,000,000 Å
The global standard for screen sizes, pipe diameters and Anglo-Saxon shoe sizes
Inch to Meter
1 in = 0.0254 m
Inch to Kilometer
1 in = 2.5400e-5 km
Inch to Centimeter
1 in = 2.54 cm
Inch to Millimeter
1 in = 25.4 mm
Inch to Mile
1 in = 1.5783e-5 mi
Inch to Yard
1 in = 0.02778 yd
Inch to Foot
1 in = 0.08333 ft
Inch to Nautical Mile
1 in = 1.3715e-5 nmi
Inch to Micrometer
1 in = 25,400 µm
Inch to Nanometer
1 in = 25,400,000 nm
Inch to Light Year
1 in = 2.6848e-18 ly
Inch to Furlong
1 in = 0.0001263 fur
Inch to Fathom
1 in = 0.01389 ftm
Inch to Angstrom
1 in = 254,000,000 Å
The international unit for marine and air navigation — 1 minute of latitude
Nautical Mile to Meter
1 nmi = 1,852 m
Nautical Mile to Kilometer
1 nmi = 1.852 km
Nautical Mile to Centimeter
1 nmi = 185,200 cm
Nautical Mile to Millimeter
1 nmi = 1,852,000 mm
Nautical Mile to Mile
1 nmi = 1.15078 mi
Nautical Mile to Yard
1 nmi = 2,025.37 yd
Nautical Mile to Foot
1 nmi = 6,076.12 ft
Nautical Mile to Inch
1 nmi = 72,913.39 in
Nautical Mile to Micrometer
1 nmi = 1,852,000,000 µm
Nautical Mile to Nanometer
1 nmi = 1,852,000,000,000 nm
Nautical Mile to Light Year
1 nmi = 1.9576e-13 ly
Nautical Mile to Furlong
1 nmi = 9.20624 fur
Nautical Mile to Fathom
1 nmi = 1,012.69 ftm
Nautical Mile to Angstrom
1 nmi = 18,520,000,000,000 Å
Used for particle size, air quality (PM2.5) and microscopic biology
Micrometer to Meter
1 µm = 1.0000e-6 m
Micrometer to Kilometer
1 µm = 1.0000e-9 km
Micrometer to Centimeter
1 µm = 1.0000e-4 cm
Micrometer to Millimeter
1 µm = 0.001 mm
Micrometer to Mile
1 µm = 6.2137e-10 mi
Micrometer to Yard
1 µm = 1.0936e-6 yd
Micrometer to Foot
1 µm = 3.2808e-6 ft
Micrometer to Inch
1 µm = 3.9370e-5 in
Micrometer to Nautical Mile
1 µm = 5.3996e-10 nmi
Micrometer to Nanometer
1 µm = 1,000 nm
Micrometer to Light Year
1 µm = 1.0570e-22 ly
Micrometer to Furlong
1 µm = 4.9710e-9 fur
Micrometer to Fathom
1 µm = 5.4681e-7 ftm
Micrometer to Angstrom
1 µm = 10,000 Å
Used in semiconductor manufacturing and visible light wavelengths
Nanometer to Meter
1 nm = 1.0000e-9 m
Nanometer to Kilometer
1 nm = 1.0000e-12 km
Nanometer to Centimeter
1 nm = 1.0000e-7 cm
Nanometer to Millimeter
1 nm = 1.0000e-6 mm
Nanometer to Mile
1 nm = 6.2137e-13 mi
Nanometer to Yard
1 nm = 1.0936e-9 yd
Nanometer to Foot
1 nm = 3.2808e-9 ft
Nanometer to Inch
1 nm = 3.9370e-8 in
Nanometer to Nautical Mile
1 nm = 5.3996e-13 nmi
Nanometer to Micrometer
1 nm = 0.001 µm
Nanometer to Light Year
1 nm = 1.0570e-25 ly
Nanometer to Furlong
1 nm = 4.9710e-12 fur
Nanometer to Fathom
1 nm = 5.4681e-10 ftm
Nanometer to Angstrom
1 nm = 10 Å
Astronomical distance unit — 9.461 × 10¹⁵ metres
Light Year to Meter
1 ly = 9.4607e15 m
Light Year to Kilometer
1 ly = 9,460,700,000,000 km
Light Year to Centimeter
1 ly = 9.4607e17 cm
Light Year to Millimeter
1 ly = 9.4607e18 mm
Light Year to Mile
1 ly = 5,878,606,438,399.75 mi
Light Year to Yard
1 ly = 1.0346e16 yd
Light Year to Foot
1 ly = 3.1039e16 ft
Light Year to Inch
1 ly = 3.7247e17 in
Light Year to Nautical Mile
1 ly = 5,108,369,330,453.56 nmi
Light Year to Micrometer
1 ly = 9.4607e21 µm
Light Year to Nanometer
1 ly = 9.4607e24 nm
Light Year to Furlong
1 ly = 47,028,851,507,197.96 fur
Light Year to Fathom
1 ly = 5.1732e15 ftm
Light Year to Angstrom
1 ly = 9.4607e25 Å
Used in UK, Irish and North American horse racing (1/8 mile)
Furlong to Meter
1 fur = 201.168 m
Furlong to Kilometer
1 fur = 0.2012 km
Furlong to Centimeter
1 fur = 20,116.8 cm
Furlong to Millimeter
1 fur = 201,168 mm
Furlong to Mile
1 fur = 0.125 mi
Furlong to Yard
1 fur = 220 yd
Furlong to Foot
1 fur = 660 ft
Furlong to Inch
1 fur = 7,920 in
Furlong to Nautical Mile
1 fur = 0.1086 nmi
Furlong to Micrometer
1 fur = 201,168,000 µm
Furlong to Nanometer
1 fur = 201,168,000,000 nm
Furlong to Light Year
1 fur = 2.1264e-14 ly
Furlong to Fathom
1 fur = 110 ftm
Furlong to Angstrom
1 fur = 2,011,680,000,000 Å
Traditional marine depth unit — 6 feet exactly
Fathom to Meter
1 ftm = 1.8288 m
Fathom to Kilometer
1 ftm = 0.001829 km
Fathom to Centimeter
1 ftm = 182.88 cm
Fathom to Millimeter
1 ftm = 1,828.8 mm
Fathom to Mile
1 ftm = 0.001136 mi
Fathom to Yard
1 ftm = 2 yd
Fathom to Foot
1 ftm = 6 ft
Fathom to Inch
1 ftm = 72 in
Fathom to Nautical Mile
1 ftm = 0.0009875 nmi
Fathom to Micrometer
1 ftm = 1,828,800 µm
Fathom to Nanometer
1 ftm = 1,828,800,000 nm
Fathom to Light Year
1 ftm = 1.9330e-16 ly
Fathom to Furlong
1 ftm = 0.009091 fur
Fathom to Angstrom
1 ftm = 18,288,000,000 Å
Used in chemistry and crystallography for atomic dimensions
Angstrom to Meter
1 Å = 1.0000e-10 m
Angstrom to Kilometer
1 Å = 1.0000e-13 km
Angstrom to Centimeter
1 Å = 1.0000e-8 cm
Angstrom to Millimeter
1 Å = 1.0000e-7 mm
Angstrom to Mile
1 Å = 6.2137e-14 mi
Angstrom to Yard
1 Å = 1.0936e-10 yd
Angstrom to Foot
1 Å = 3.2808e-10 ft
Angstrom to Inch
1 Å = 3.9370e-9 in
Angstrom to Nautical Mile
1 Å = 5.3996e-14 nmi
Angstrom to Micrometer
1 Å = 0.0001 µm
Angstrom to Nanometer
1 Å = 0.1 nm
Angstrom to Light Year
1 Å = 1.0570e-26 ly
Angstrom to Furlong
1 Å = 4.9710e-13 fur
Angstrom to Fathom
1 Å = 5.4681e-11 ftm
Tips for length conversions
Most countries use the metric system for everyday distances. The US and UK still use miles on road signs, while the UK uses metres for smaller measurements.
One metre is roughly the distance from your nose to the tip of your outstretched hand — a useful body-based estimate when no ruler is available.
Screen sizes (TV, monitor, phone) are always given in inches diagonally, even in metric countries.
1 metre = 100 cm = 1000 mm — these three metric relationships are the foundation of construction and design drawings.
Common mistakes to avoid
Confusing the statute mile (1.609 km) with the nautical mile (1.852 km) — the difference matters for aviation and marine navigation.
Reading a TV size as width instead of diagonal — a 55-inch screen is 139.7 cm diagonally, not wide.
Rounding too early in a chain of conversions. Keep decimals until the final step.
Mixing up km and miles on a US car speedometer — a reading of 60 mph is 96 km/h, not 60.
Learn about each unit
Full encyclopedia page for every length unit — definition, history, uses, tips.
What is a meter?
m
What is a kilometer?
km
What is a centimeter?
cm
What is a millimeter?
mm
What is a mile?
mi
What is a yard?
yd
What is a foot?
ft
What is a inch?
in
What is a nautical mile?
nmi
What is a micrometer?
µm
What is a nanometer?
nm
What is a light year?
ly
What is a furlong?
fur
What is a fathom?
ftm
What is a angstrom?
Å