Convert inches to kilometers
Converting inches to kilometers is a common length task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 in equals 0.0000254 km, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert inches to kilometers
To convert inches to kilometers, multiply the number of inches by 0.0000254. For example, 10 in × 0.0000254 = 0.000254 km.
km = in × 0.0000254
- Write down the value in inches you want to convert.
- Multiply it by 0.0000254 (the exact in→km factor).
- The result is your value in kilometers. Check it below with the converter or the table.
Conversion table
Common values of inches and their equivalents in kilometers:
| in | km |
|---|---|
| 1 | 0.0000254 |
| 2 | 0.0000508 |
| 3 | 0.0000762 |
| 4 | 0.0001016 |
| 5 | 0.000127 |
| 10 | 0.000254 |
| 20 | 0.000508 |
| 25 | 0.000635 |
| 50 | 0.00127 |
| 100 | 0.00254 |
| 250 | 0.00635 |
| 500 | 0.0127 |
About these units
Inch (in). An inch is a unit of the imperial and US customary systems, legally defined as exactly 25.4 millimeters since 1959. It is used for screen sizes, tools and construction in the United States.
Kilometer (km). A kilometer equals 1,000 meters and is the standard metric unit for road distances and geography. One kilometer is about 0.62 miles or a 12-minute walk.
Frequently asked questions
How do I convert inches to kilometers?
To convert inches to kilometers, multiply the number of inches by 0.0000254. For example, 10 in × 0.0000254 = 0.000254 km. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many kilometers are in 1 inch?
1 in = 0.0000254 km. That is the fixed relationship used by this converter and by international standards.
How many inches are in 1 kilometer?
1 km = 39,370.1 in. If you are converting in the opposite direction, use our Kilometer to Inch converter for the dedicated table and FAQ.
Is the inches to kilometers conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.0000254 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is inch used for?
An inch is a unit of the imperial and US customary systems, legally defined as exactly 25.4 millimeters since 1959. It is used for screen sizes, tools and construction in the United States.