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 first

If measurements are in yards, multiply each by 3 first

For irregular shapes, break the object into smaller rectangular sections and add the cubic feet of each section

For cylinders, use the formula: cubic feet = π × radius² × height, with all measurements in feet

For spheres, use the formula: cubic feet = 4/3 × π × radius³, with the radius in feet

For cones, use the formula: cubic feet = 1/3 × π × radius² × height, with all measurements in feet