Measure the length, width, and height of the object in inches
Multiply length × width × height
Use the formula: cubic inches = L × W × H
For irregular shapes, break the object into smaller rectangular sections and add the results
For cylinders, use the formula: cubic inches = π × radius² × height
For spheres, use the formula: cubic inches = 4/3 × π × radius³
Make sure all measurements are in inches before calculating
Round the final result if needed