What the calculator estimates
The calculator converts bed length, width, and depth into volume, then applies soil density and waste to estimate cubic yards, bags, tons, and cost.
Estimate topsoil before you order
Enter the area and depth, choose a soil type, and compare bulk cubic yards with bag counts. Soil density and moisture change real weight, so use this as a planning estimate and confirm with your supplier.
ProjectGarden bed
Soil typeScreened topsoil
Waste factor10%
Bed dimensions
For irregular beds, split the project into rectangles and add them separately.
Soil and cost
Density is editable because moisture, compaction, and amendment change real weight.
Good depth starting points
Garden beds often use 6 to 12 inches of soil, raised beds 8 to 12 inches, lawn topdressing 0.25 inch, and leveling 1 to 2 inches of screened soil or sand.
Planning note
Soil density and coverage change by moisture, compaction, amendment, and supplier. Confirm density, delivery minimums, and final order before purchase.
Formula used
- Convert length, width, and depth to feet.
- Cubic feet = length x width x depth.
- Cubic yards = cubic feet / 27.
- Tons = cubic yards x tons per cubic yard x waste factor.
- Bags = tons x 2,000 / bag size, rounded up.
- Bulk cost = cubic yards x price per yard x waste factor.
- Bagged cost = bags x bag price.
How much topsoil do I need for a garden bed?
Multiply bed length by width and by depth in feet for cubic feet, then divide by 27 for cubic yards. Add a 10 percent waste factor for settling and spreading. This calculator automates that math for any bed size and depth.
How many cubic yards are in a 40 lb bag of topsoil?
A 40 lb bag of topsoil holds roughly 0.75 to 0.8 cubic feet, so it takes about 34 to 36 bags to make one cubic yard. Bag coverage varies by moisture and compaction, so this calculator lets you set the bag size for your supplier.
Should I buy topsoil in bulk or bags?
Bulk topsoil by the cubic yard is usually cheaper for projects over about 2 to 3 yards. Bags cost more per yard but are easier for small beds, stairs, and tight access. This calculator shows both costs so you can compare.
How much waste should I add for topsoil?
A 10 percent waste factor is common for settling, spreading, and uneven ground. Use 15 to 20 percent for very loose, fluffy, or wet soil, or for beds with many curves and edges that create more offcuts.
What depth of topsoil do I need for a new lawn?
A new lawn usually needs 4 to 6 inches of topsoil before seeding or sod. Topdressing an existing lawn uses a thin 0.25 inch layer, while leveling low spots may need 1 to 2 inches. Enter your project depth for an exact estimate.
Is this a contractor quote?
No. It is a planning estimate. Prices, delivery fees, taxes, minimum orders, soil blend, and site conditions vary by supplier and location.