This approach keeps irregular geometry auditable. Measure rectangles, triangles and circles separately, then enter each section’s area rather than guessing one average length and width.
01 / Formula
How this is calculated
Cubic yards = (section 1 + section 2 + section 3) × depth in ÷ 32402 / Assumptions
What the estimate assumes
- ✓Each entered section area is measured independently.
- ✓Sections do not overlap.
- ✓Depth is uniform across the combined bed.
03 / Worked example
See the math in context
Sections of 120, 85 and 45 sq ft total 250 sq ft; at 3 inches deep that equals 2.31 cubic yards before allowance.
04 / Guidance
Avoid overlapping sections
Sketch boundaries and assign every part of the bed to one shape. Where shapes overlap, subtract the shared area once.
Questions
Frequently asked
How do I measure an irregular area?+
Split the bed or lawn into rectangles, circles, and triangles, calculate each area, then add them. Measure narrow curves in shorter sections for a better approximation.
Should I include extra material?+
Use a visible allowance for grade variation, settlement, compaction, spillage, cuts, or future repair as appropriate. The right percentage depends on the material and site.