Cubic inch

The cubic inch (in³) is a unit of volume primarily used in the United States for measuring the capacity of small objects and the displacement of internal combustion engines. While the metric system has gained global prominence, the cubic inch remains significant in specific industries and applications, especially in the field of automotive engineering.

Definition and Usage

The cubic inch is defined as the volume of a cube with sides measuring one inch (1 in) in length. It is equal to 16.3871 cubic centimeters (cm³) or approximately 0.0005787 cubic feet (ft³). This unit is often used for measuring the engine displacement of automobiles, motorcycles, and other vehicles, as well as for quantifying the capacity of small containers and objects.

Applications of Cubic Inch

The cubic inch serves specific purposes in various fields:

  • Automotive Engineering: Engine displacement, especially in American vehicles, is expressed in cubic inches to indicate the size and power of an engine.
  • Machining: Machinists and manufacturers use cubic inches to measure the volume of materials they work with, such as metal and plastic.
  • Customary Units: In the United States, some industries and individuals prefer using customary units like cubic inches alongside the metric system.

Conversions and Equivalents

Converting cubic inches to other units of volume is useful for a range of applications:

  • 1 Cubic Inch (in³) ≈ 16.3871 Cubic Centimeters (cm³)
  • 1 Cubic Inch (in³) ≈ 0.0005787 Cubic Feet (ft³)
  • 1 Cubic Inch (in³) ≈ 0.0000164 Cubic Yards (yd³)
  • 1 Cubic Inch (in³) ≈ 0.0000000243 Cubic Meters (m³)


While the metric system is the global standard for measurement, the cubic inch (in³) remains relevant in specific American industries and contexts. Whether you're dealing with engine specifications, manufacturing, or custom projects, understanding and using cubic inches can be essential for precise measurements and calculations.

Keywords: Cubic Inch, in³, volume unit, engine displacement, customary units, cubic inch conversions