Cubic Feet Calculator

Use this cubic feet calculator to multiply a space's length, width, and height, all in feet, into its volume. A 10 ft by 8 ft by 4 ft space holds 320 cubic feet. Convert inches to feet first by dividing by 12, so a 30 in. height becomes 2.5 ft.

Last reviewed September 2026Method & sources Report an error

Not to scale.

Volume

320.00 cu ft

Breakdown
Volume	320.00 cu ft

How to Calculate Cubic Feet

Volume of a rectangular space is simply length × width × height, all measured in feet.

Example: 10 ft × 8 ft × 4 ft space

A 10 ft × 8 ft × 4 ft space: Volume: 10 × 8 × 4 = 320 cu ft

What Is Cubic Feet?

A cubic feet calculator converts a rectangular space's three dimensions into its volume. It is useful for a storage space, a raised garden bed, a box or bin, or any rectangular container or area where you need volume, not only floor area. For a cylindrical volume (like a tube or drum), see the Cylinder Cubic Footage calculator instead.

Cubic Feet: Pros and Cons

Pros

Straightforward, direct application of the length × width × height formula with no hidden assumptions
Works for any rectangular volume, from a small storage bin to a large room
Complements the Cubic Yards calculator, which adds the conversion to cubic yards for bulk material purposes

Cons

Only handles a rectangular (box-shaped) volume. A cylindrical, irregular, or tapered shape needs a different formula
Doesn't convert to cubic yards. Use the Cubic Yards calculator if that's the unit you need
Assumes all three dimensions are measured in feet. Convert inches to feet first if that's how you measured

Frequently Asked Questions

How do I calculate cubic feet?

Multiply length by width by height, with all three dimensions measured in feet. A 10 ft × 8 ft × 4 ft space is 320 cubic feet.

How many cubic feet are in a cubic yard?

There are 27 cubic feet in a cubic yard, since a cubic yard is 3 ft × 3 ft × 3 ft. Divide a cubic feet figure by 27 to convert to cubic yards.

Does this work for a cylindrical container?

No. A cylinder's volume uses π × radius² × height instead of length × width × height. Use the Cylinder Cubic Footage calculator for that shape.

How do I convert inches to feet for this calculator?

Divide the inch measurement by 12. A 30 in. height, for example, is 30 ÷ 12 = 2.5 ft.

What is cubic feet used for?

It's a standard volume unit for anything from shipping and storage capacity to HVAC airflow calculations and the volume of a room or container. Use it when height or depth matters, since square feet only measures floor space.

Measurement