How much does a bulk bag of topsoil cover?

In the UK, a standard bulk bag usually contains approximately 0.6m³ to 0.7m³ of soil, which weighs around 850kg. At a depth of 50mm (2 inches), one bulk bag will cover approximately 12 to 14 square metres.

What is the difference between Topsoil and Screened Topsoil?

Standard topsoil can contain small stones and roots. 'Screened' topsoil has been passed through a mesh (usually 10mm or 20mm) to remove larger debris, making it much easier to level for lawns and flower beds.

How deep should topsoil be for a new lawn?

For a healthy lawn, you should aim for a minimum of 100mm (4 inches) of good quality topsoil. If the ground below is very poor or stony, increasing this to 150mm will yield better long-term results.

How much does topsoil settle?

Topsoil contains air pockets when first delivered. Once spread and trodden in or watered, it will typically settle (shrink) by about 10-15%. Our calculator uses a 1.5 tonne per m³ density which accounts for this settled weight.

How much does a bulk bag of topsoil cover?

In the UK, a standard bulk bag usually contains approximately 0.6m³ to 0.7m³ of soil, which weighs around 850kg. At a depth of 50mm (2 inches), one bulk bag will cover approximately 12 to 14 square metres.

What is the difference between Topsoil and Screened Topsoil?

Standard topsoil can contain small stones and roots. 'Screened' topsoil has been passed through a mesh (usually 10mm or 20mm) to remove larger debris, making it much easier to level for lawns and flower beds.

How deep should topsoil be for a new lawn?

For a healthy lawn, you should aim for a minimum of 100mm (4 inches) of good quality topsoil. If the ground below is very poor or stony, increasing this to 150mm will yield better long-term results.

How much does topsoil settle?

Topsoil contains air pockets when first delivered. Once spread and trodden in or watered, it will typically settle (shrink) by about 10-15%. Our calculator uses a 1.5 tonne per m³ density which accounts for this settled weight.

Topsoil Volume Calculator

Accurate soil and compost estimator for UK gardens and allotments.

Length (m)

Width (m)

Target Depth (mm)

Soil Volume

Gardening Tip: For a new lawn, you typically need **100mm to 150mm** of quality topsoil over your subsoil. For raised vegetable beds, you may need up to **300mm to 450mm** to allow for deep root growth. Always order slightly more than you need, as topsoil will settle by 10-15% after watering.

Garden Foundations: The Topsoil Guide

Nutrient-Rich Soil

The success of any garden project—whether it's laying new turf or building raised beds—depends entirely on the quality and depth of the topsoil. Soil is heavy and expensive to deliver, so getting the volume right is essential.

By using our **topsoil calculator**, you can estimate exactly how many tonnes or bulk bags you need, helping you budget accurately and avoid multiple delivery charges.

Standard Coverage

1 Bulk Bag (at 50mm)~12.5m²

1 Bulk Bag (at 100mm)~6.25m²

Average Weight1.5 Tonnes per m³

Choosing the Right Depth

The depth of soil you need depends entirely on what you are planting:

- **New Lawns / Turf:** 100mm to 150mm.
- **General Borders:** 200mm to 300mm.
- **Vegetable Beds:** 300mm to 450mm.
- **Levelling / Top Dressing:** 10mm to 25mm.

Bulk Bags vs Loose

For projects under 5 tonnes, bulk bags are often easier to manage as they keep the soil contained. For larger projects, ordering 'loose' (tipped from a truck) is significantly cheaper but requires space for a large pile.

Compaction

Always order 10% more than your calculated volume. This accounts for compaction when you walk over the soil to level it and for natural settling over the first few weeks.

Pro Tip: Test Your Drainage

Before adding new topsoil, dig a small hole in your subsoil and fill it with water. If it takes hours to drain, your subsoil is likely heavy clay. Consider mixing in **organic matter or horticultural grit** to prevent your new topsoil from becoming waterlogged.

Topsoil & Soil FAQ

Technical Disclaimer

Soil density varies based on moisture content and composition (sandy vs clay). These calculations provide an estimate based on average UK topsoil. Always verify bag sizes and coverage with your specific supplier before purchase.