Cubic Inch

Cubic Inch (in³)

The cubic inch is a unit of volume particularly important in the automotive industry for measuring engine displacement. It’s the volume of a cube measuring one inch on each side.

Characteristics

• Imperial volume unit
• 1 in³ = 16.3871 milliliters
• 1 in³ ≈ 16.3871 cm³ (effectively equal)
• 1,728 in³ = 1 cubic foot
• Common in: engine displacement, small containers, precision manufacturing

Applications

• Engine displacement and cylinder volume (e.g., “350 cubic inch V8”)
• Small container and package volumes
• Precision manufacturing and machining
• Fluid capacity in small systems
• Dental and medical equipment

Conversions

• 1 in³ = 16.3871 mL
• 1 in³ = 16.3871 cm³
• 1 in³ = 0.000578704 ft³
• 1 in³ = 0.554113 fl oz (US)
• 1 in³ = 0.0163871 L

Note

Cubic inches are often written as “ci” in automotive contexts (e.g., “350 ci engine”).