Topsoil calculator
Estimate topsoil volume and whole bags from area, depth and your chosen allowance.
Formula
V = area × depth × (1 + extra/100); bags = ceil(V / bag volume).
Area: 200 ft² · Soil depth: 4 in · Volume per bag: 1 ft³ · Soil volume ≈ (200 ft² × 0.09290304 m²/ft²)×(4 in × 0.0254 m/in)×(1+(10)÷100) · Cubic yards ≈ (2.07656875)÷0.764554857984 · Whole bags ≈ ceil((2.07656875)×1000÷(1 ft³ × 28.31684659 L/ft³)×(1-8.881784197001252e-16))
How to use
- Enter the area and soil depth.
- Set an allowance and the volume printed on one bag.
- Read cubic meters, cubic yards and whole bags.
Examples
- 20 m² at 10 cm with 10% extra needs 2.2 m³, or 55 bags of 40 L.
Frequently asked questions
Does this calculate soil weight?
No. Moisture and bulk density vary; this calculator uses volume only.
Is 10% extra required?
No. It is an editable example, not a compaction or settlement factor.
How do I measure an irregular area?
Split it into simpler shapes and add their areas. Follow your supplier’s depth and volume guidance.
Sources
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