Cubic Feet Calculator: Boxes, Cylinders
This cubic feet calculator finds the volume of a box, room, cylinder, sphere or cone and shows the result in cubic feet, cubic yards, cubic inches, gallons, liters and cubic meters. Choose a shape, enter the dimensions in inches, feet, yards, centimeters or meters, and add a quantity if you have several of the same item. Use it to size a freezer, a moving box, a storage unit, a planter, a water tank or the air volume of a room. It is quick, runs offline in your browser, and uses US units alongside metric.
Cubic Feet Calculator
Calculate volume in cubic feet from a box, cylinder, sphere, cone or room.
How to use the Cubic Feet Calculator
- Choose the shape: box, cylinder, sphere or cone.
- Pick the unit for your measurements.
- Enter the dimensions and the quantity.
- Read the volume in cubic feet and other units.
- Copy the result for your plan or shopping list.
Volume formulas
Box: length × width × height. Cylinder: ฯ × (diameter ÷ 2)² × height. Sphere: ฯ × diameter³ ÷ 6. Cone: one third of the cylinder volume. All dimensions are first converted to feet.
Features
- Box, cylinder, sphere and cone
- Inches, feet, yards, centimeters and meters
- Cubic feet, cubic yards, gallons and liters
- Quantity multiplier
- Instant results
- Copy and print
Frequently asked questions
How do I calculate cubic feet?
Multiply length by width by height in feet. A box 4 ft long, 3 ft wide and 2 ft high is 24 cubic feet.
How do I convert inches to cubic feet?
Multiply length, width and height in inches, then divide by 1,728, because one cubic foot is 12 × 12 × 12 cubic inches.
How many gallons are in a cubic foot?
One cubic foot holds about 7.48 US gallons of liquid.
How do I find the cubic feet of a cylinder?
Use ฯ × radius² × height with everything in feet. A cylinder 2 ft across and 3 ft tall is about 9.42 cubic feet.
How many cubic feet are in a cubic yard?
There are 27 cubic feet in one cubic yard.