How much does soil weigh per cubic metre?

Topsoil weighs approximately 1.2-1.4 tonnes per cubic metre depending on moisture content. Compost is lighter at around 0.4-0.6 t/m³. This calculator uses 1.3 t/m³ as a typical average for blended soil.

Should I add extra for settlement?

Yes. New soil in raised beds settles by 10-15% over the first year. The compaction factor in advanced options accounts for this. Start with beds slightly overfilled.

What is a bulk bag of soil?

A standard bulk bag (tonne bag) holds approximately 0.85 m³ of soil. They are more economical than small bags for larger projects and are delivered by lorry with a crane or grab.

GardenCalcs

Soil Volume Calculator

Calculate soil needed for raised beds, planters, and containers of various shapes.

Container ShapeChoose the shape of your bed or container

Length

Longest side of the bed

Width

Shortest side of the bed

Depth

How deep the soil needs to be

Quantity

Number of identical beds or containers

Price per Bag (optional)

Price per bag for cost estimation

How We Calculate This

Volume is calculated from your container dimensions using standard geometry formulas for each shape.

A compaction factor is added (default 10%) to account for settlement. Results are shown in cubic metres, litres, standard bag counts and bulk bag quantities.

Frequently Asked Questions

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Calculate topsoil volume needed in cubic metres, bulk bags, or tonnes.

Mulch Calculator

Work out how much mulch you need for beds, borders, and paths.

Soil Amendment Calculator

Calculate quantities of grit, sand, or organic matter to improve soil.

Last updated: March 2026

All calculations are estimates based on standard gardening guidelines. Results may vary with soil conditions, climate, and plant varieties.