Topsoil Calculator
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A topsoil calculator determines how many cubic yards of topsoil you need to cover a garden bed, lawn, or landscaping area. Topsoil is the upper 2–8 inches of soil — the biologically active layer where plants grow.
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Tip: Mix topsoil 50:50 with compost for garden beds — pure topsoil often compacts and drains poorly. Order from local suppliers; topsoil is heavy and expensive to ship. Test pH before planting (most vegetables prefer 6.0–7.0).
- 1Volume = Length (ft) × Width (ft) × Depth (in) / 324 = cubic yards
- 2For lawns: 3–4 inches of topsoil for seeding; 1–2 inches for topdressing
- 3For garden beds: 6–8 inches of quality topsoil
- 4Weight: topsoil weighs ~1.1–1.5 tons per cubic yard (depending on moisture)
| Application | Depth | Notes |
|---|---|---|
| Topdressing existing lawn | 0.5–1 inch | Too thick smothers grass |
| New lawn seeding | 3–4 inches | Blend with existing soil |
| Vegetable garden | 6–12 inches | Deep topsoil for root crops |
| Flower beds | 4–6 inches | Supplement with compost |
| Raised beds | 8–12 inches | Often use topsoil/compost mix |
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Fun Fact
It takes 500–1,000 years for 1 inch of topsoil to form naturally through weathering and biological activity. The US loses about 1.7 billion tons of topsoil to erosion annually — one of the most serious but least-discussed environmental issues.
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