Cubic Feet Calculator

Find the volume of boxes, rooms, tanks or anything shaped like a box. Measure in any unit, add several items and get the total in cubic feet, yards, gallons and liters.

LengthWidthHeightQtyft³
Total cubic feet–
Cubic yards–
Cubic meters–
US gallons–
Liters–

Cubic feet formula

Cubic feet = length (ft) × width (ft) × height (ft)
From inches: L × W × H ÷ 1,728
Cubic yards = cubic feet ÷ 27 · Gallons = cubic feet × 7.48

Worked example

A moving box that is 18 × 18 × 16 inches holds 18 × 18 × 16 = 5,184 cubic inches. Dividing by 1,728 gives 3 cubic feet. Ten of those boxes take up 30 cubic feet.

Common sizes in cubic feet

ItemTypical sizeVolume
Small moving box16 × 12 × 12 in1.3 ft³
Medium moving box18 × 18 × 16 in3.0 ft³
Large moving box18 × 18 × 24 in4.5 ft³
Standard pallet load48 × 40 × 48 in53.3 ft³
5 × 10 storage unit (8 ft high)5 × 10 × 8 ft400 ft³
10 × 10 storage unit (8 ft high)10 × 10 × 8 ft800 ft³

Ordering landscape material? The cubic yard calculator works in yards directly. Shipping a pallet? Check its freight class. For round tanks and other shapes, use the volume calculator.

Last reviewed October 2026.

Frequently asked questions

How do I calculate cubic feet?

Multiply length × width × height, with all three measured in feet. If you measure in inches, multiply the three numbers and divide by 1,728 (because 12 × 12 × 12 = 1,728 cubic inches in a cubic foot).

How many cubic feet are in a cubic yard?

There are 27 cubic feet in a cubic yard (3 ft × 3 ft × 3 ft). Divide cubic feet by 27 to get cubic yards, which is how soil, mulch and concrete are often sold.

How many gallons are in a cubic foot?

One cubic foot holds about 7.48 US gallons, or 28.3 liters. That is useful for fish tanks, ponds and water tanks.

Can I add several boxes or items?

Yes. Add a row for each item, set the quantity, and the calculator totals them. That works well for moving boxes, storage units and shipping.

How big a moving truck or storage unit do I need?

A rough guide is 150 to 200 cubic feet of belongings per furnished room. A 10 × 10 storage unit with 8 ft walls holds about 800 cubic feet, though you can never pack it perfectly full.