How Much Topsoil Do I Need? A Simple Volume Guide

Measure the area, then choose a depth

Start by measuring the length and width of the area in feet and multiplying them for the area in square feet. For odd shapes, split the space into rectangles, work each one out, and add them up. A raised bed 10 ft by 4 ft is 40 sq ft; a small lawn patch 20 ft by 15 ft is 300 sq ft.

Depth depends on the job. For overseeding or a light dressing, 1–2 inches is enough. For a new lawn, aim for 4–6 inches of good topsoil. For vegetable beds and planting, 8–12 inches gives roots room to grow. Deeper jobs use far more soil, so the depth you pick drives the whole order.

Turn area and depth into a volume

Volume is simply area times depth, but keep the units consistent. Convert the depth from inches to feet by dividing by 12, then multiply by the area in square feet to get cubic feet. Divide cubic feet by 27 to reach cubic yards, the unit most suppliers sell and deliver in.

Take that 300 sq ft lawn patch at 4 inches: 300 × (4 ÷ 12) = 100 cubic feet, or 100 ÷ 27 = 3.7 cubic yards. Round up to 4 cubic yards so a shortfall does not stop you mid-job. A calculator does the unit juggling for you and shows the result in both cubic yards and tons.

From volume to weight for delivery

Bulk topsoil is often quoted by the ton, so you may need to convert. A cubic yard of screened topsoil weighs roughly 1 to 1.3 tons depending on moisture and how much sand or clay it holds; wet soil is heavier. Multiply your cubic yards by about 1.1 tons for a safe delivery estimate.

Delivery matters too. A cubic yard is heavy and bulky, so a driveway drop is easier than barrowing it round the back. Order slightly over rather than under: paying for a little extra soil is cheaper than a second delivery fee, and leftover topsoil is easy to spread or store for the next project.

Frequently asked questions

How many cubic yards are in a ton of topsoil?

About 0.7 to 1 cubic yard per ton, since a cubic yard weighs roughly 1 to 1.3 tons. Moisture changes it: wet soil packs more weight into the same volume, so treat any conversion as an estimate and round up.

Should I order extra topsoil?

Yes — add 5 to 10%. Fresh topsoil settles and compacts once watered and walked on, so a bed that measured full to the brim will sink. A small surplus covers settling and any low spots you missed while measuring.

Is topsoil the same as garden soil or compost?

No. Topsoil is the upper layer of native soil used to build up beds and level ground. Compost is decomposed organic matter used to enrich soil, and bagged garden soil is often a blend of both. For depth-based volume jobs, price and order plain topsoil, then mix in compost.

How deep should topsoil be for a new lawn?

Aim for 4 to 6 inches of good topsoil over prepared ground. That gives grass roots enough depth to establish and hold moisture. Multiply your lawn area by that depth to size the order, and level and lightly firm the soil before seeding or laying sod.