Free topsoil calculator
Topsoil Calculator
Calculate how much topsoil a lawn, garden, or landscaping job needs in cubic yards and cubic feet. Add multiple areas, enter the soil depth you plan to add, include extra material if needed, and optionally calculate bags, a rounded bulk order, and material cost.
Calculate how much topsoil you need
Measure each area, enter the depth of topsoil to add, and use supplier-specific bag or bulk details only when you need them.
1. Topsoil areas
Use simple shapes or enter a known area in square feet. Add separate sections for lawns, garden beds, raised beds, or other areas receiving topsoil.
2. Topsoil depth and extra material
Enter the actual depth of new topsoil you plan to add. If you are only topping up an existing soil layer, enter the additional depth needed for this job.
Use the depth specified for the job.
Add your own buffer for grading, settling, compaction, measurement uncertainty, or other job conditions.
3. Buying options
Topsoil bag sizes and bulk ordering increments vary. Enter the actual package size and supplier pricing you plan to use, or leave these fields blank if you only need cubic yards.
Enter the package volume only if you want a whole-bag count or bagged material cost.
Requires a bag size to calculate bagged material cost.
Material price only. Delivery, tax, minimum orders, and other fees are not added automatically.
Choose the order increment your supplier uses, or leave the exact cubic-yard volume unrounded.
4. Topsoil quantity
Area and volume results require only complete area measurements, soil depth, and any extra-material percentage. Bag and cost results appear when the matching optional inputs are available.
Add at least one complete area and enter the topsoil depth to calculate material quantity.
Your measurements and pricing inputs are processed in your browser and aren't sent to us.
Material estimate only. Actual order quantity can vary with grading, compaction, settling, soil moisture, measurement accuracy, supplier increments, bag size, delivery requirements, and site conditions. If you need a weight or tonnage estimate, use the density information provided by your supplier because topsoil weight can vary significantly.
How to calculate how much topsoil you need
- Add each area that will receive topsoil. For irregular areas, divide the job into simpler shapes or enter a known square-foot measurement.
- Enter the depth of new topsoil you plan to add in inches.
- Add an extra-material percentage only if you want your own buffer for grading, settling, compaction, or measurement uncertainty.
- If you are buying bags, enter the actual cubic-foot volume printed on the package.
- If you are buying bulk topsoil, choose the order increment your supplier uses and add optional pricing if you want a material-cost estimate.
Topsoil calculator formula
The calculator converts the measured area and topsoil depth into cubic feet, applies any extra-material percentage you enter, and then converts the result into cubic yards.
area (sq ft) × depth (in) ÷ 12cubic feet ÷ 27base volume × (1 + extra %)ceil(cubic feet ÷ bag size)Topsoil calculator for cubic yards, cubic feet, and bags
If you are asking “how much topsoil do I need?”, start with the square footage of the area and the depth of soil you plan to add. This topsoil calculator converts those measurements into cubic feet and cubic yards so you can plan a bulk order without relying on a fixed bag size or supplier assumption.
If you are buying bagged soil, enter the package volume to calculate how many bags you need. For bulk topsoil, you can round the exact cubic-yard result up to the ordering increment used by your supplier and optionally estimate material cost.
Topsoil calculator FAQ
How many cubic yards of topsoil do I need?
Enter the total area and the depth of topsoil you plan to add. The calculator converts the resulting cubic feet into cubic yards automatically.
How many bags of topsoil do I need?
Enter the cubic-foot volume printed on the bag. The calculator divides the required soil volume by that package size and rounds up to a whole bag.
Can I calculate several areas at once?
Yes. Add separate sections and combine rectangles, circles, triangles, or areas you already know in square feet.
Should I add extra topsoil?
That depends on the job. The extra-material field is optional so you can apply your own buffer for grading, settling, compaction, or measurement uncertainty instead of relying on a built-in percentage.
Why doesn't this calculator convert topsoil to tons?
Topsoil weight varies with soil composition, moisture, and compaction. If you need a weight or tonnage estimate, use the density or conversion information provided by the supplier for the material you plan to buy.
Does the cost estimate include delivery or tax?
No. Bagged and bulk cost estimates use only the prices you enter. Delivery, tax, minimum orders, fees, labor, and other charges are not added automatically.