Define the surfacing footprint
Use the required use-zone footprint for the equipment layout, not just the equipment footprint.
Subtract only areas that truly do not receive the surfacing system.
Use the required depth
Convert the specified installed depth to feet before calculating volume.
Safety standards and product test data control the required system depth.
Convert volume
Cubic feet = area × depth; cubic yards = cubic feet ÷ 27.
For unitary systems, follow manufacturer quantity and installation data instead of loose-fill volume assumptions.
Plan maintenance separately
Loose-fill surfacing can displace or compact in service and requires maintenance.
Initial quantity does not replace inspection and maintenance requirements.