How to use this calculator
Select the shape you are measuring: rectangular (boxes, rooms, storage units), cylindrical (tanks, pipes, drums), or triangular prism (A-frame spaces, wedge shapes). Enter each dimension with its unit and get the volume in cubic feet plus conversions.
You can mix units freely. For example, enter length in feet, width in inches, and height in centimeters. The calculator converts everything to feet before computing volume.
Understanding cubic feet
A cubic foot is the volume of a cube that measures one foot on each side. It equals 1,728 cubic inches, roughly 28.3 liters, or about 7.48 US gallons. Cubic feet are commonly used in the United States for measuring storage space, shipping volume, refrigerator capacity, and material quantities.
When ordering landscaping materials like mulch, soil, or gravel, suppliers typically sell by the cubic yard (27 cubic feet). For international shipping, you may need cubic meters. This calculator shows all common conversions so you can order the right amount regardless of how the material is sold.
Frequently asked questions
How do you calculate cubic feet?
For a rectangular shape, multiply length times width times height, all in feet. If your measurements are in inches, multiply them together and divide by 1,728. For a cylinder, use pi times radius squared times height.
How many cubic feet is a 10x10 storage unit?
A 10x10 storage unit with standard 8 foot ceilings has 800 cubic feet of usable space. This is generally enough to store the contents of a one to two bedroom apartment.
How do you convert cubic feet to cubic yards?
Divide cubic feet by 27. There are 27 cubic feet in one cubic yard (3 x 3 x 3). This conversion is essential when ordering landscaping materials sold by the yard.
How many gallons are in a cubic foot?
One cubic foot holds approximately 7.48 US gallons. Multiply your cubic feet by 7.48 to find the gallon capacity of a tank, pool, or container.
What size moving truck do I need?
A 10 foot truck holds about 400 cubic feet (studio apartment). A 15 foot truck holds about 764 cubic feet (one bedroom). A 20 foot truck holds about 1,015 cubic feet (two to three bedrooms). A 26 foot truck holds roughly 1,682 cubic feet (three to four bedrooms).