Topsoil Calculator — Cubic Yards, Tons & Cost 2026

Formula — How to Calculate Topsoil

The topsoil calculator formula converts area and depth into volume. Because suppliers sell topsoil by the cubic yard and you measure your area in feet and depth in inches, two unit conversions are required.

Worked example — new lawn 50 × 30 ft at 4 inches: Area = 1,500 sq ft. Cubic yards = 1,500 × 4 ÷ 324 = 18.52 yd³. Add 15% settling = 21.30 yd³. Tons = 21.30 × 1.1 = 23.43 tons. Order 22 cubic yards — this rounds up to ensure adequate material after settling.

Worked example — raised bed 4 × 8 ft at 12 inches: Area = 32 sq ft. Cubic yards = 32 × 12 ÷ 324 = 1.19 yd³. Add 20% settling for garden mix = 1.43 yd³. Order 1.5 cubic yards to have a small surplus for top-up after initial settling.

Topsoil Types and Densities

Not all topsoil is the same material or the same weight. Using the wrong density figure leads to under-ordering — the most common and costly topsoil mistake.

Garden mix is lighter than screened topsoil because it contains compost, which has a much lower density than mineral soil. This is why bags of garden mix from a hardware store often feel lighter than bags of plain topsoil — they contain more air and organic matter by volume. For weight-based truck load planning, always use the density of your specific material and confirm with your supplier.

Depth Guide by Project Type

Depth is the variable that changes your topsoil order more than anything else. Using too little depth creates short-lived results — grass roots hit subsoil quickly, plants struggle in dry weather, and raised beds produce poor yields. Using too much wastes money. These depths are based on USDA NRCS soil health guidelines and landscape industry standards.

Pre-Calculated Quantities — Common Project Sizes

All figures include a 15 percent settling buffer. Screened topsoil at 1.1 tons per cubic yard.

Why Topsoil Settles — And How Much Extra to Order

Topsoil delivered by dump truck arrives in a loose, aerated state. The act of tipping the load, transporting it in a wheelbarrow, and spreading it introduces air pockets throughout the material. After watering, foot traffic, and gravity over several weeks, those air pockets collapse and the volume decreases. This is settling — not material loss, but compaction of the existing material.

Screened topsoil typically settles 10 to 20 percent. A 4-inch-deep application after settling will end up at approximately 3.2 to 3.6 inches. For a new lawn where the finished grade matters — matching an adjacent driveway, patio, or edging — this settling must be built into the calculation.

Settling rates by material: screened topsoil 10 to 15 percent. Garden mix with high compost content 20 to 30 percent — compost is largely air and organic material that breaks down further after installation. Fill dirt 5 to 10 percent — already more compacted when delivered. The calculator above applies the settling factor automatically based on the project type selected.

Watering immediately after spreading accelerates settling and reveals low spots that need topping up. Do this before seeding or sodding — not after.

Fill Dirt vs Topsoil — Which Do You Need?

This is the most expensive mistake in topsoil projects. Using topsoil where fill dirt is appropriate wastes $15 to $30 per cubic yard on every yard of unnecessary material.

Fill dirt contains no organic matter and will not support healthy plant growth. Grass seeded directly into fill dirt will germinate but struggle once roots reach the compacted subsoil layer. Always cap fill dirt with a minimum of 4 inches of screened topsoil before any lawn or planting work.

Raised Bed Topsoil Guide

Raised beds have specific requirements that differ from standard topsoil applications. Because the bed is elevated and drainage is rapid, pure topsoil is often the worst choice for raised bed filling.

The recommended raised bed mix is 60 percent screened topsoil, 30 percent compost, and 10 percent coarse sand or perlite. This blend drains well, retains moisture without waterlogging, and provides both the bulk fill of topsoil and the nutrient density of compost. For a standard 4 × 8 ft bed at 12 inches deep: total volume is 1.19 cubic yards before settling. With 20 percent settling allowance for the compost component: order 1.43 cubic yards of blended mix, or calculate 0.86 yd³ topsoil, 0.43 yd³ compost, and 0.14 yd³ coarse sand separately.

For root crops — carrots, parsnips, beets — fill to 18 inches. Shallow beds produce stunted, forked root vegetables regardless of soil quality. The extra 6 inches of depth makes a measurable difference in harvest yield.

Do not use fill dirt in a raised bed under any circumstances. Fill dirt compacts immediately in a raised bed environment and produces a concrete-like layer that roots cannot penetrate. Garden mix or blended loam is the minimum acceptable fill for any productive raised bed.

Bulk vs Bags — Break-Even Calculation

The savings on large lawn projects are so significant that even in areas with expensive delivery fees, bulk topsoil is the only practical choice above 2 cubic yards. The bag figures above assume 40-lb bags at $7 each and 0.5 cubic feet per bag. Actual bag prices vary from $5 to $9 — but even at the low end, bulk is cheaper above 2 cubic yards for any project with delivery available.

Topsoil Cost 2026

Regional variation is significant. The Southeast and Midwest generally have lower prices due to abundant supply. The Northeast and Pacific Coast run 15 to 30 percent higher. Late autumn and winter orders often attract 10 to 20 percent discounts as suppliers clear inventory before the slow season. Spring — particularly April and May — is peak pricing season. If your project is flexible on timing, ordering in late autumn can save meaningfully on large quantities.

Related Calculators