Measure the length, width, and height in feet
Multiply length × width × height
Use the formula: cubic feet = L × W × H
If measurements are in inches, divide each by 12 before multiplying
If measurements are in yards, multiply each by 3 before multiplying
For irregular shapes, break the space into smaller rectangular sections and add the results
For cylinders, use the formula: cubic feet = π × radius² × height
For spheres, use the formula: cubic feet = 4/3 × π × radius³