Measure pea-gravel areas
For rectangles, enter each area once and keep sections from overlapping. For a circular area, measure across its diameter. The calculator treats entered depth as a geometric loose-material depth; actual delivered or settled quantity can differ. An optional allowance changes the order estimate only and is not a universal waste or compaction factor.
Worked example
A 10 × 12 ft area at 3 inches deep with no allowance contains 30 ft³, or 1.11 yd³. At the selected planning density of 1.35 US short tons/yd³, that is approximately 1.50 US tons (3,000 lb). For illustration only, a 0.50 ft³ volume bag gives 60 bags; a 40 lb weight bag at the same assumed density gives 75 bags. The two counts differ because one is based on package volume and the other on package weight. These are editable examples, not universal bag specifications; use product labels and supplier density.