Garden Soil & Topsoil Calculator
Whether you're filling a new raised bed, topping up lawn areas, or conditioning existing soil, this calculator tells you exactly how much topsoil or compost to order.
Topsoil Depth Guide
How Deep Does Topsoil Need to Be?
Lawn over-seeding: 50–75mm. New lawn from scratch: 100–150mm. Vegetable beds: 200–300mm. Raised beds (above ground): fill to the top. Shrub border preparation: 150–200mm.
Bulk Bags vs Bagged Compost
A bulk bag of topsoil (typically 0.75 m³, ~1 tonne) is far more economical for areas over 3–4 m². For small raised beds or container filling, 40L bags are more practical despite higher cost per cubic metre.
Soil Quality Matters
Buy topsoil to BS 3882 standard (Grade A for growing). Cheap topsoil can contain weed seeds, stones, and poor structure. For vegetable growing, a quality raised bed mix (topsoil + compost + grit) outperforms plain topsoil significantly.
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