How do I convert Inch (in) to Centimeter (cm)?

1 in equals 2.54 cm using SI-based conversion and precise factors.

What is the formula to convert Inch (in) to Centimeter (cm)?

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

2.54 cm

1 in = 2.54 cm

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.

Centimeter (cm)

1/100 of a meter. Common in technical drawings and everyday measurements.

History: Spread globally with metrication in the 19th–20th centuries.