Cubic Feet Calculator

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cubic feet calculator
Rectangular Prism (Box)Cylinder (Pipe/Tank)
Feet (ft)Inches (in)Yards (yd)Meters (m)Centimeters (cm)
Result:
ft³
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Equivalent to '+yards.toLocaleString(undefined,{maximumFractionDigits:4})+' Cubic Yards (yd³)';}document.getElementById('extraResult').innerHTML=extra;document.getElementById('answer').style.display='block';}

How to Use the Cubic Feet Calculator

A cubic feet calculator is an essential tool for anyone needing to measure the volume of a space or an object. Whether you are shipping a package, calculating soil for a garden bed, or determining the storage capacity of a room, knowing the volume in cubic feet (ft³) is the industry standard for logistics and construction in many regions.

To use this tool effectively, simply follow these steps:

1. Choose Your Shape
Select "Rectangular Prism" for boxes, rooms, or holes, or "Cylinder" for pipes, tanks, and circular pillars.
2. Enter Dimensions
Input the length, width, and height. If you are calculating a cylinder, you only need the radius and the height.
3. Select Units
You don't need to convert measurements to feet beforehand. Select your current unit (inches, yards, meters, etc.), and the calculator will handle the conversion automatically.

The Formula for Cubic Feet

The math behind volume depends on the geometric shape of the object. Our cubic feet calculator utilizes two primary formulas:

Rectangular Prism (Box) Formula

Volume (ft³) = Length × Width × Height

All dimensions must be in feet. If you measure in inches, divide each dimension by 12 before multiplying, or divide the total cubic inches by 1,728 (which is 12x12x12).

Cylindrical Shape Formula

Volume (ft³) = π × Radius² × Height

Where π (Pi) is approximately 3.14159. The radius is exactly half of the diameter of the circular face.

Calculation Examples

Example 1: Shipping a Box
Suppose you have a shipping container that measures 24 inches long, 18 inches wide, and 12 inches high. What is the volume in cubic feet?

  1. Convert inches to feet: Length = 2ft, Width = 1.5ft, Height = 1ft.
  2. Multiply: 2 × 1.5 × 1 = 3.
  3. Result: 3 Cubic Feet.

Example 2: Landscaping Mulch
You need to fill a circular garden bed that has a radius of 5 feet and you want the mulch to be 0.5 feet (6 inches) deep.

  1. Use Cylinder Formula: π × 5² × 0.5
  2. Calculation: 3.14159 × 25 × 0.5
  3. Result: ~39.27 Cubic Feet.

Frequently Asked Questions

How many cubic feet are in a cubic yard?

There are exactly 27 cubic feet in one cubic yard. To convert cubic feet to cubic yards, simply divide your result by 27. This is common when ordering bulk materials like topsoil or concrete.

How do I calculate cubic feet from inches?

Multiply length × width × height in inches to get cubic inches, then divide the result by 1,728. Alternatively, you can use our cubic feet calculator and select "Inches" from the dropdown menu to get the answer instantly.

Is cubic feet the same as square feet?

No. Square feet (ft²) measures area (2D), while cubic feet (ft³) measures volume (3D). To get cubic feet from square feet, you must multiply the surface area by the height or depth of the object.

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