# Kilometer Conversion Calculator

Enter a value in kilometers below to convert to another unit of length.

## Results:

Do you want to convert kilometers to miles?

## What Is a Kilometer?

A kilometer is a unit used to measure length.

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 thousands, or 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.

## How Long Is a Kilometer?

One kilometer is equal to 1,000 meters, which are defined as the distance light travels in a vacuum in 1/299,792,458 of a second.[1] One kilometer is equal to 0.621371 miles.

## How to Convert Kilometers

To convert kilometers to another unit of length, you need to multiply the value by a conversion factor. A conversion factor is a numerical value used to change the units of a measurement without changing the value.[2]

You can find the conversion factors for kilometers in the conversion table below.

Then, multiply the length measurement by the conversion factor to find the equivalent value in the desired unit of measurement.

kilometers × conversion factor = result

You can also use a calculator, such as one of the converters below, for the conversion.

## Kilometer 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

## Kilometer Conversion Calculators

You can also convert length using one of our kilometer converters below.

US Customary & Imperial Units
SI Units

Try our other measurement calculators.

## References

1. 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
2. National Institute of Standards & Technology, Unit Conversion, https://www.nist.gov/pml/owm/metric-si/unit-conversion

## Other Length Units

US Customary & Imperial Units
SI Units