Outline each bed
Sketch the area you intend to cover. For a rectangle, measure length and width. Divide irregular outlines into smaller sections and calculate each separately.
Record the dimensions
Measure length and width in feet. Multiply them to find surface area in square feet. Estimates for curved boundaries are approximate.
Choose your added depth
Enter the depth of new material in inches. Consider what is already there and confirm a suitable depth for your planting and material. The default is an example, not plant-care advice.
Check the bag or bulk unit
Use the cubic-foot volume printed on your bag. The calculator also shows cubic yards for bulk orders. Confirm the supplier’s units and delivery quantities before ordering.
A 12 × 10 ft bed at an illustrative depth of 3 inches needs 120 × (3 ÷ 12) = 30 cu ft, or about 1.11 cu yd, before any additional allowance.
Keep in mind
This geometric volume estimate does not account for settling, compaction, weight or delivery limits. It does not select a suitable depth for your plants.
Planning guidance only. Confirm measurements and product requirements before buying. Read the calculator disclaimer.