Convert Inches to Kilometers
1 inch (in) equals 0.0000254 kilometers (km).
1 in = 0.0000254 km
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk inch to kilometer converter to paste a column from Excel.
How to Convert Inch to Kilometer
- 1 in = 0.0000254 km
- 1 km = 39370.07874 in
- Example: convert 15 in to km: 15 in = 15 × 0.0000254 km = 0.000381 km
Reference conditions. in: The international yard and pound agreement (1959) fixed 1 yard = 0.9144 m exactly, so the inch, foot and mile are exact.
Formula
km = in × 0.0000254
or km = in ÷ 39370.07874016
Derivation from SI units:
- 1 in = 2.54 cm = 0.0254 m (exact)
- 1 km = 10³ m
- 1 in = 0.0254 m ÷ 1000 m per km = 0.0000254 km
Both units are defined exactly, so the factor is exact. Inch definition: inch; Kilometer definition: kilometer.
Worked examples
- A reading of 4 in converts to 0.0001016 km.
4 in × 0.0000254 = 0.0001016 km - A value of 24 in is 0.0006096 km.
24 in × 0.0000254 = 0.0006096 km
Inch to Kilometer conversion table
| Inches (in) | Kilometers (km) |
|---|---|
| 0.125 in | 0.000003175 km |
| 0.25 in | 0.00000635 km |
| 0.5 in | 0.0000127 km |
| 0.75 in | 0.00001905 km |
| 1 in | 0.0000254 km |
| 1.5 in | 0.0000381 km |
| 2 in | 0.0000508 km |
| 3 in | 0.0000762 km |
| 4 in | 0.0001016 km |
| 5 in | 0.000127 km |
| 6 in | 0.0001524 km |
| 8 in | 0.0002032 km |
| 10 in | 0.000254 km |
| 12 in | 0.0003048 km |
| 15 in | 0.000381 km |
| 20 in | 0.000508 km |
| 24 in | 0.0006096 km |
| 27 in | 0.0006858 km |
| 32 in | 0.0008128 km |
| 36 in | 0.0009144 km |
| 48 in | 0.0012192 km |
| 55 in | 0.001397 km |
| 65 in | 0.001651 km |
| 72 in | 0.0018288 km |
Where it's used
Inches are used for screen and TV sizes (diagonal), while kilometers appear in road distances and speed (km/h). Both measure length and distance, so the conversion is a fixed factor.
Inch to other length units
| Conversion | 1 in equals |
|---|---|
| inch to meter | 0.0254 m |
| inch to kilometer | 0.0000254 km |
| inch to centimeter | 2.54 cm |
| inch to millimeter | 25.4 mm |
| inch to micrometer | 25400 µm |
| inch to nanometer | 25400000 nm |
| inch to angstrom | 254000000 Å |
| inch to mile | 0.00001578282828 mi |
| inch to yard | 0.02777777778 yd |
| inch to foot | 0.08333333333 ft |
| inch to mil | 1000 mil |
| inch to nautical mile | 0.00001371490281 nmi |
Frequently asked questions
How many kilometers are in 1 inch?
1 in = 0.0000254 km.
How do I convert inches to kilometers?
Multiply the value in in by 0.0000254, or divide it by 39370.07874. For example, 15 in × 0.0000254 = 0.000381 km.
Is the in to km conversion exact?
Yes. Both units are defined exactly, and 1 in is exactly 0.0000254 km.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "inch (in)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Inches to Kilometers. Retrieved October 17, 2026, from https://scientificconverters.com/length/inches-to-kilometers/
IEEE
Scientific Converters, "Convert Inches to Kilometers," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/inches-to-kilometers/