How Much to Buy

Topsoil and garden soil calculator

For raised beds, new garden beds or filling low spots. Get cubic yards, bags and an approximate weight.

Measure the area

Add each section separately. Lengths can be typed as 12, 12.5, 12' 6" or 3m.

Depth and bags
in
tons
Compare prices

Optional. Add local prices to compare bags against a bulk delivery.

Name it for your list

What to buy

Enter your measurements to see how much to buy.

How the soil math works

Area (sq ft) × depth (in) ÷ 12 = cubic feet
Cubic feet ÷ 27 = cubic yards
Cubic yards × weight per yard = approximate tons

Worked example

A 4 × 8 ft raised bed filled 12 inches deep holds 32 cubic feet, which is 1.19 cubic yards. That’s 43 bags of 0.75 cu ft or 32 bags of 1 cu ft, and roughly 1.3 tons at 1.1 tons per yard.

What goes in a raised bed

Many gardeners fill raised beds with a blend (often topsoil mixed with compost) rather than straight topsoil. The volume math is the same for any mix, so enter the full depth you plan to fill and split the total between ingredients by your recipe.

Check before you buy: soil weight varies a lot with moisture and composition, roughly 1.0–1.3 tons per cubic yard for typical topsoil. If your supplier sells by the ton, ask for their conversion. New soil settles, so beds filled to the brim often sink an inch or two over the first season.

Common questions

How many bags of soil fill a 4×8 raised bed?

At 12 inches deep a 4 × 8 bed needs 32 cubic feet: 43 bags of 0.75 cu ft, 32 bags of 1 cu ft, or 22 bags of 1.5 cu ft.

How much does a cubic yard of topsoil weigh?

Usually around 1.0 to 1.3 tons, depending on moisture and how much sand, clay or organic matter it contains. Your supplier can give an exact figure.

Should I buy soil in bags or bulk?

For more than about a cubic yard, bulk is usually cheaper even with delivery. Bags are easier for small beds or where a truck can’t reach. Use the price fields to compare.

How deep should soil be for a new lawn?

Many guides suggest 4 to 6 inches of good topsoil under new sod or seed. Local extension offices can advise for your soil type.

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