How do I convert Inch (in) to Kilometer (km)?

1 in equals 2.5E-05 km using SI-based conversion and precise factors.

What is the formula to convert Inch (in) to Kilometer (km)?

This is a linear unit conversion using a constant factor between units.

Yes, it uses exact definitions or standardized constants (e.g., 1 in = 25.4 mm).

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Category: Length

Value From To Precision

2.5E-05 km

1 in = 2.5E-05 km

High-precision rounding: 6 decimals

We convert by pivoting through the SI base unit for Length and applying exact factors where applicable.

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Length measures distance. SI base is the meter; many legacy units survive in trade and navigation.

Inch (in)

Imperial/US customary unit of length; exactly 25.4 mm.

History: Fixed at exactly 25.4 mm by international agreement in 1959.

Kilometer (km)

1,000 meters. Common for road and geographic distances.

History: Adopted with the metric system during the 19th century.