Use consistent units
One cubic yard equals 27 cubic feet. For a rectangular area measured in feet, multiply length by width and depth in feet, then divide by 27. If depth is in inches, divide by 12 first.
A convenient equivalent is: cubic yards = area in square feet × depth in inches ÷ 324. Measure separate zones separately when their required depths differ.
A worked application example
For an illustrative 60-foot by 20-foot area at a specified 4-inch depth, the footprint is 1,200 square feet. The theoretical volume is 1,200 × 4 ÷ 324, or about 14.81 cubic yards. This is arithmetic for a uniform layer, not a measured customer project.
The calculator below uses your inputs and applies no waste, settlement or compaction allowance. Those depend on the material, installation specification and field conditions. Confirm the order quantity with the contractor or supplier.
Why this does not measure an irregular pile
Multiplying a pile’s maximum length, width and height treats the pile as a full rectangular box and usually includes empty space. A cone or wedge formula can also be misleading when the shape differs from that assumption.
For inventory, a reconstructed surface compared with an appropriate base can represent an irregular visible shape. Hidden sides, connected piles and an unknown base still need review.
Check what the supplier is selling
Some suppliers price in cubic yards; others use weight. A volume-to-weight conversion requires the correct bulk density for the actual product and condition. Loose material, compacted material and wet material should not be treated as interchangeable.
Keep the measured area, specified depth, theoretical quantity and purchasing allowance as separate entries. That makes the estimate easy to adjust when the scope changes.
- Confirm feet versus yards and inches versus feet.
- Separate different material zones and depths.
- Ask whether quoted volume refers to loose or installed material.
- Record the source of any density or allowance.
Area and depth to cubic yards
Theoretical uniform-layer volume. No waste, settlement or compaction allowance is included. This does not measure an irregular pile.
Landscape material takeoffs
A documented starting point for ordering mulch, soil, gravel or other landscape materials.
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