Convert Inches to Kilometers

Enter the length in inches below to get the value converted to kilometers.

Results in Kilometers:
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1 in = 2.54E-5 km

How to Convert Inches to Kilometers

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

To convert a inch measurement to a kilometer measurement, multiply the length by the conversion ratio. One inch is equal to 2.54E-5 kilometers, so use this simple formula to convert:

kilometers = inches × 2.54E-5

The length in kilometers is equal to the inches multiplied by 2.54E-5.

For example, here's how to convert 5 inches to kilometers using the formula above.
5" = (5 × 2.54E-5) = 0.000127 km

Our inch fraction calculator can add inches and kilometers together and it also automatically converts the results to US customary, imperial and SI metric values.

Inches and kilometers are both units used to measure length. Keep reading to learn more about each unit of measure.


An inch is a unit of linear length measure equal to 1/12 of a foot or 1/36 of a yard. Because the international yard is legally defined to be equal to exactly 0.9144 meters, one inch is equal to 2.54 centimeters.

The inch is a US customary and imperial unit of length. Inches can be abbreviated as in, for example 1 inch can be written as 1 in.

Inches can also be denoted using the symbol, otherwise know as a double-prime. Often a double-quote (") is used instead of a double-prime for convenience. Using the double-prime, 1 in can be written as 1″.

A quarter is .955" in diameter, which is just smaller than 1"

The standard ruler has 12", and are a common measuring tool for measuring inches. They are also often measured using tape measures which commonly come in lengths from 6' - 35'. Other types of measuring devices include scales, calipers, measuring wheels, micrometers, yardsticks, and even lasers.


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.

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.

We recommend using a ruler or tape measure for measuring length, which can be found at a local retailer or home center. Rulers are available in imperial, metric, or combination with both values, so make sure you get the correct type for your needs.

If you need a ruler you can also download and print our free printable rulers, which include both imperial and metric measurements.

Inch Measurements and Equivalent Kilometer Conversions

Common inch values converted to the equivalent kilometer value
Inches Kilometers
1" 0.0000254 km
2" 0.0000508 km
3" 0.0000762 km
4" 0.000102 km
5" 0.000127 km
6" 0.000152 km
7" 0.000178 km
8" 0.000203 km
9" 0.000229 km
10" 0.000254 km
11" 0.000279 km
12" 0.000305 km
13" 0.00033 km
14" 0.000356 km
15" 0.000381 km
16" 0.000406 km
17" 0.000432 km
18" 0.000457 km
19" 0.000483 km
20" 0.000508 km
21" 0.000533 km
22" 0.000559 km
23" 0.000584 km
24" 0.00061 km
25" 0.000635 km
26" 0.00066 km
27" 0.000686 km
28" 0.000711 km
29" 0.000737 km
30" 0.000762 km
31" 0.000787 km
32" 0.000813 km
33" 0.000838 km
34" 0.000864 km
35" 0.000889 km
36" 0.000914 km
37" 0.00094 km
38" 0.000965 km
39" 0.000991 km
40" 0.001016 km

More Inch Length Conversions

US Customary & Imperial Units
Convert to Miles
1" is equal to 1.5783E-5 miles
Convert to Yards
1" is equal to 0.027778 yards
Convert to Feet
1" is equal to 0.083333 feet
SI Units
Convert to Meters
1" is equal to 0.0254 meters
Convert to Centimeters
1" is equal to 2.54 centimeters
Convert to Millimeters
1" is equal to 25.4 millimeters
Convert to Micrometers
1" is equal to 25,400 micrometers
Convert to Nanometers
1" is equal to 25,400,000 nanometers