Cubic Inches Calculator

A cubic inches calculator returns the volume of a rectangular object in cubic inches, from its length, width, and height in inches. It multiplies the three dimensions, then divides by 1,728 for cubic feet. A 12 in. cube holds 1,728 cubic inches, which is exactly 1 cubic foot.

Last reviewed September 2026Method & sources Report an error

Not to scale.

Volume

1,728.000 cu in

Breakdown
Volume	1,728.000 cu in
Volume	1.000 cu ft

How to Calculate Cubic Inches

Volume is length × width × height, all in inches. Dividing by 1,728 (12³) converts the result to cubic feet.

Example: 12 in. × 12 in. × 12 in. cube

A 12 in. × 12 in. × 12 in. cube: 1. Volume: 12 × 12 × 12 = 1,728 cu in. 2. In cubic feet: 1,728 ÷ 1,728 = 1 cu ft

What Is Cubic Inches?

A cubic inches calculator finds the volume of a small rectangular object measured in inches. It is useful for a box, a small container, a piece of material, or anything too small to comfortably work with in cubic feet.

Cubic Inches: Pros and Cons

Pros

Gives both cubic inches and cubic feet, since small objects are often specified in one unit and larger volumes in the other
Fine-grained input precision, appropriate for smaller, more precisely measured objects
A direct, exact conversion with no approximation

Cons

Only handles a rectangular (box-shaped) volume. A cylindrical or irregular shape needs a different formula
For a room or larger space, the Cubic Feet calculator's feet-based inputs are more practical
Assumes all three dimensions are measured in inches. Convert first if any dimension was measured in feet

Frequently Asked Questions

How do I calculate cubic inches?

Multiply length by width by height, all in inches. A 12 in. cube is 12 × 12 × 12 = 1,728 cu in.

How many cubic inches are in a cubic foot?

1,728. Since a foot is 12 inches, a cubic foot is 12 × 12 × 12 = 1,728 cu in.

How do I convert cubic inches to cubic feet?

Divide by 1,728. 3,456 cu in. is 3,456 ÷ 1,728 = 2 cu ft.

Why would I calculate volume in cubic inches instead of cubic feet?

Cubic inches is more practical for small objects, such as a small box, a piece of material, or a container where cubic feet would be an awkwardly small fraction.

Does this work for a cylindrical container?

No. A cylinder's volume is π × radius² × height, not length × width × height. Use a shape-specific calculator for a non-rectangular volume.

Measurement