Kilometers Conversion

Tape measures can be used to measure units of length, and a calculator can be used to convert to another unit

The kilometer is a unit used to measure length. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about kilometers.

Kilometer Conversion Calculators

Choose a unit of length to convert to.

US Customary & Imperial Units

Convert kilometers to miles: 1 kilometer is equal to 0.621371 miles
Convert kilometers to yards: 1 kilometer is equal to 1,094 yards
Convert kilometers to feet: 1 kilometer is equal to 3,281 feet
Convert kilometers to inches: 1 kilometer is equal to 39,370 inches

SI Units

Convert kilometers to meters: 1 kilometer is equal to 1,000 meters
Convert kilometers to centimeters: 1 kilometer is equal to 100,000 centimeters
Convert kilometers to millimeters: 1 kilometer is equal to 1,000,000 millimeters
Convert kilometers to micrometers: 1 kilometer is equal to 1,000,000,000 micrometers
Convert kilometers to nanometers: 1 kilometer is equal to 1,000,000,000,000 nanometers

Kilometer Definition and Usage

One kilometer is equal to 1,000 meters, which are defined as the distance light travels in a vacuum in a ¹/_299,792,458 second time interval.^[1]

The kilometer, or kilometre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "kilo" is the prefix for 10³. Kilometers can be abbreviated as km, for example 1 kilometer can be written as 1 km.

Uses

The kilometer is officially used for expressing distance between geographical places around the world, with the exception of the United States, which uses the mile. In the US, it is actually prohibited to use federal highway funding to purchase road signs using kilometers or other metric units.

Kilometers Measurement Conversion Table

Common kilometer values and equivalent imperial and metric length measurements
kilometers	miles	yards	feet	inches	meters	centimeters	millimeters	micrometers	nanometers
1 km	0.621371 mi	1,094 yd	3,281'	39,370"	1,000 m	100,000 cm	1,000,000 mm	1,000,000,000 µm	1,000,000,000,000 nm
2 km	1.242742 mi	2,187 yd	6,562'	78,740"	2,000 m	200,000 cm	2,000,000 mm	2,000,000,000 µm	2,000,000,000,000 nm
3 km	1.864114 mi	3,281 yd	9,843'	118,110"	3,000 m	300,000 cm	3,000,000 mm	3,000,000,000 µm	3,000,000,000,000 nm
4 km	2.485485 mi	4,374 yd	13,123'	157,480"	4,000 m	400,000 cm	4,000,000 mm	4,000,000,000 µm	4,000,000,000,000 nm
5 km	3.106856 mi	5,468 yd	16,404'	196,850"	5,000 m	500,000 cm	5,000,000 mm	5,000,000,000 µm	5,000,000,000,000 nm
6 km	3.728227 mi	6,562 yd	19,685'	236,220"	6,000 m	600,000 cm	6,000,000 mm	6,000,000,000 µm	6,000,000,000,000 nm
7 km	4.349598 mi	7,655 yd	22,966'	275,591"	7,000 m	700,000 cm	7,000,000 mm	7,000,000,000 µm	7,000,000,000,000 nm
8 km	4.97097 mi	8,749 yd	26,247'	314,961"	8,000 m	800,000 cm	8,000,000 mm	8,000,000,000 µm	8,000,000,000,000 nm
9 km	5.592341 mi	9,843 yd	29,528'	354,331"	9,000 m	900,000 cm	9,000,000 mm	9,000,000,000 µm	9,000,000,000,000 nm
10 km	6.213712 mi	10,936 yd	32,808'	393,701"	10,000 m	1,000,000 cm	10,000,000 mm	10,000,000,000 µm	10,000,000,000,000 nm
11 km	6.835083 mi	12,030 yd	36,089'	433,071"	11,000 m	1,100,000 cm	11,000,000 mm	11,000,000,000 µm	11,000,000,000,000 nm
12 km	7.456454 mi	13,123 yd	39,370'	472,441"	12,000 m	1,200,000 cm	12,000,000 mm	12,000,000,000 µm	12,000,000,000,000 nm
13 km	8.077825 mi	14,217 yd	42,651'	511,811"	13,000 m	1,300,000 cm	13,000,000 mm	13,000,000,000 µm	13,000,000,000,000 nm
14 km	8.699197 mi	15,311 yd	45,932'	551,181"	14,000 m	1,400,000 cm	14,000,000 mm	14,000,000,000 µm	14,000,000,000,000 nm
15 km	9.320568 mi	16,404 yd	49,213'	590,551"	15,000 m	1,500,000 cm	15,000,000 mm	15,000,000,000 µm	15,000,000,000,000 nm
16 km	9.941939 mi	17,498 yd	52,493'	629,921"	16,000 m	1,600,000 cm	16,000,000 mm	16,000,000,000 µm	16,000,000,000,000 nm
17 km	10.56331 mi	18,591 yd	55,774'	669,291"	17,000 m	1,700,000 cm	17,000,000 mm	17,000,000,000 µm	17,000,000,000,000 nm
18 km	11.184681 mi	19,685 yd	59,055'	708,661"	18,000 m	1,800,000 cm	18,000,000 mm	18,000,000,000 µm	18,000,000,000,000 nm
19 km	11.806053 mi	20,779 yd	62,336'	748,031"	19,000 m	1,900,000 cm	19,000,000 mm	19,000,000,000 µm	19,000,000,000,000 nm
20 km	12.427424 mi	21,872 yd	65,617'	787,402"	20,000 m	2,000,000 cm	20,000,000 mm	20,000,000,000 µm	20,000,000,000,000 nm

References

Ambler Thompson and Barry N. Taylor, Guide for the Use of the International System of Units (SI), National Institute of Standards and Technology, https://physics.nist.gov/cuu/pdf/sp811.pdf

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