Measure the length, width, and height in feet
Multiply length × width × height to get cubic feet
Divide the cubic feet by 27 to get cubic yards
Use this formula: cubic yards = (length × width × height) ÷ 27
For irregular shapes, break the space into smaller rectangles or boxes, find each volume, then add them together
If measurements are in inches, convert to feet first by dividing by 12
If measurements are in yards, convert to feet first by multiplying by 3