Topsoil Calculator

Whether you're starting a new lawn, filling raised beds, prepping garden soil, or topdressing an existing yard, this calculator tells you exactly how much topsoil to order in cubic yards, tons, and bags.

Units:

MaterialArea Shape

Length

Width

Depth

Recommended: 2–8 inches

Waste Factor

Bulk Price

$/yd

Bag Price

$/bag

Worked Example

A gardener is filling a 4 × 8 ft raised bed 12 inches deep with garden mix.

1 Raised bed area: 4 × 8 = 32 sq ft
2 Volume: 32 × (12/12) = 32 cu ft = 1.2 cu yd
3 Add 10% waste: 1.2 × 1.10 = 1.3 cu yd
4 Weight: 1.3 × 0.88 = 1.1 tons
5 1 cu ft bags: (1.3 × 27) / 1 = 35 bags

Order 1.3 cubic yards bulk, or 35 one-cubic-foot bags. At $30/cu yd bulk, that's approximately $39.

How Topsoil Is Calculated

The calculation follows a simple pipeline: measure the area, multiply by depth to get volume, then convert to the units your supplier sells.

Area × Depth = Volume (cu ft) → divide by 27 for cubic yards → multiply by material density for tons → divide by bag size for bag count. All quantities include your waste factor so you always have enough.

Different soil types have different densities. Screened topsoil is heavier (~1.01 tons/cu yd) while garden mix with compost is lighter (~0.88 tons/cu yd). Pure compost is lighter still (~0.54 tons/cu yd). The calculator adjusts weight and bag counts based on your selected soil type.

Soil Depth Guide

Use Case	Depth	Notes
Lawn Topdressing	2–4 inches	Level out low spots and improve turf
Garden Beds	6–8 inches	Mix into existing soil for best results
Raised Beds	10–12 inches	Fill entire bed depth with garden mix
Filling Low Spots	2–4 inches	Apply in lifts, compact between layers

Frequently Asked Questions

What's the difference between topsoil and garden soil? +

Topsoil is natural soil screened to remove debris — it has moderate nutrient content and is used for grading, filling, and lawn establishment. Garden soil (garden mix) is topsoil blended with compost, peat, or other amendments to boost nutrients and drainage, making it ideal for flower beds and vegetable gardens.

How much topsoil do I need to top-dress my lawn? +

For lawn topdressing, spread screened topsoil 2–4 inches deep. A typical 1,000 sq ft lawn at 2 inches needs about 6.2 cubic yards. Use our calculator to enter your exact dimensions and get a precise estimate including waste factor.

Can I mix topsoil with existing soil? +

Yes — and you should. Mixing new topsoil into existing soil prevents a hard boundary between layers that can trap water. Till or rake the new topsoil into the top few inches of your existing ground for the best root growth and drainage.

Is topsoil the same as fill dirt? +

No. Fill dirt is subsoil with little to no organic matter — it's used to raise grade or fill holes. Topsoil is the nutrient-rich upper layer of soil that supports plant growth. Never use fill dirt where you plan to grow plants.

You May Also Need

Mulch Calculator

Calculate mulch for garden beds and landscaping

Calculate →

Sand Calculator

Leveling sand, play sand, and fill sand quantities

Calculate →

Gravel Calculator

Gravel for driveways, patios, and drainage

Calculate →

Stone Calculator

Crushed stone and aggregate for landscaping projects

Calculate →

Disclaimer: This calculator provides estimates for planning purposes only. Actual material requirements depend on site conditions, compaction, grading, and local building codes. Always verify measurements on-site and consult with your material supplier before purchasing.