Find cubic yards from a rectangle, circle, triangle, known area, or existing volume. Add quantity and waste, select a material density, and estimate weight, bags, truck loads, and cost.
Formula
rectangle area = length × width
circle area = π × (diameter ÷ 2)²
triangle area = base × height ÷ 2
cubic feet = area in ft² × depth in ft × quantity
cubic yards = cubic feet ÷ 27
order amount = cubic yards × (1 + waste% ÷ 100)
Weight is order volume × the selected bulk density. Bag count always rounds up to a whole bag; truck loads remain fractional so you can discuss delivery size with the supplier.
Measure depth at several points when the ground is uneven.
The average compacted depth is more useful than the deepest measurement.
Examples
20 × 10 feet at 6 inches
The base volume is 100 ft³, or 3.704 yd³. With 10% waste, order about 4.07 cubic yards.
10-foot circle at 4 inches
The volume is about 0.970 cubic yards before waste.