Cubic inches (in³) are a unit of volume commonly used in the United States and other countries for measuring small volumes, particularly in engineering, manufacturing, and automotive contexts. One cubic inch is equivalent to the volume of a cube with sides that are each one inch long. Cubic inches are often used to measure engine displacement, the volume of containers, and the size of mechanical components. While cubic inches are less common in everyday use compared to other units like cubic centimeters or cubic meters, they remain important in specific industries and applications where precise measurements of small volumes are required.