How to measure this project
Measure the finished footprint and use an average compacted or installed depth that matches the project specification. For sloped or variable-depth areas, split the project or use a conservative average only when appropriate. Sand density changes with material type and moisture, so record the source of the density value you enter.
Before you buy materials
Order units depend on the supplier: some sell sand by cubic yard, others by ton. Use the volume result for yard-based ordering and the density-based result for weight-based ordering. Compaction, moisture, delivery minimums and site loss are outside the simple geometry, so verify supplier recommendations before placing the order.