Measure the length (L) in feet
Measure the width (W) in feet
Measure the height (H) in feet
Multiply: cubic feet = L × W × H
For a rectangular box: cubic feet = length (ft) × width (ft) × height (ft)
For a cylinder: cubic feet = π × (radius (ft))² × height (ft)
For a sphere: cubic feet = (4/3) × π × (radius (ft))³
For a cone: cubic feet = (1/3) × π × (radius (ft))² × height (ft)
For irregular shapes: divide into smaller shapes, find each volume in cubic feet, then add
If measurements are in inches: convert to feet by dividing by 12 before multiplying
If measurements are in yards: convert to feet by multiplying by 3 before multiplying
If you have volume in other units: convert to cubic feet using the appropriate conversion factor before using the formula