How Much Topsoil Do I Need? Calculator + 2026 Guide

Most homeowners need 1 to 4 cubic yards of topsoil for a typical lawn repair, garden bed, or sod prep job. The exact amount depends on three numbers: the square footage you're covering, how deep the soil needs to go, and a small waste factor for settling. This guide gives you the one-line formula, a depth chart by use case, real worked examples for lawns and raised beds, bag-vs-bulk pricing for 2026, and the questions to ask your supplier before you order.

The topsoil formula (cubic yards)

Cubic yards = (Length ft × Width ft × Depth in inches) ÷ 324

324 is the magic number because 1 cubic yard equals 27 cubic feet, and there are 12 inches per foot — so (27 × 12) ÷ 1 = 324. Multiply your final answer by 1.10 to add 10% for settling and spillage. Topsoil compresses 10 to 15% once it's spread and watered, so the bag math always reads a little light.

Topsoil formula (bags)

Bags = Cubic feet needed ÷ 0.75

A standard bag of topsoil at Home Depot or Lowe's holds 0.75 cubic feet (about 40 lb). One cubic yard equals roughly 36 bags. For anything over 1 cubic yard, bulk delivery is almost always cheaper than bagged.

How deep should topsoil be?

• Topdressing an existing lawn — 1/4 to 1/2 inch
• Overseeding prep — 1/2 inch
• New lawn from seed — 2 to 3 inches
• New lawn from sod — 3 to 4 inches
• Vegetable garden bed — 6 to 12 inches
• Raised bed (full depth) — 8 to 12 inches
• Leveling low spots in yard — fill to match grade, usually 1 to 3 inches
• Tree or shrub planting — 18 to 24 inches in the planting hole

Topsoil calculator chart by lawn size

These numbers assume a 3-inch depth — the standard for a brand-new lawn from sod or seed. They already include the 10% waste factor.

• 500 sq ft — 4.6 cubic yards (about 165 bags)
• 1,000 sq ft — 9.2 cubic yards (about 330 bags)
• 1,500 sq ft — 13.8 cubic yards
• 2,000 sq ft — 18.3 cubic yards
• 5,000 sq ft — 45.8 cubic yards
• 1/4 acre (10,890 sq ft) — 99.8 cubic yards
• 1/2 acre (21,780 sq ft) — 199.6 cubic yards

Same chart at 1/2 inch (topdressing only)

• 500 sq ft — 0.85 cubic yard
• 1,000 sq ft — 1.7 cubic yards
• 2,000 sq ft — 3.4 cubic yards
• 5,000 sq ft — 8.5 cubic yards

Worked example — 10x20 raised bed at 10 inches deep

1. Length × Width: 10 × 20 = 200 sq ft
2. Apply formula: (200 × 10) ÷ 324 = 6.17 cubic yards
3. Add 10% waste: 6.17 × 1.10 = 6.79 cubic yards
4. Round up to a typical delivery size: 7 cubic yards
5. In bags: 6.17 × 27 ÷ 0.75 = 222 bags (delivery is cheaper above 1 yard)

2026 topsoil prices per cubic yard

• Screened topsoil (bulk) — $12 to $55 per cubic yard
• Premium screened loam — $35 to $80 per cubic yard
• Garden-mix (topsoil + compost) — $30 to $70 per cubic yard
• Super-soil / mushroom blend — $40 to $90 per cubic yard
• Bagged topsoil (0.75 cu ft) — $2 to $5 per bag
• Delivery fee (typical 10-mile radius) — $50 to $150 flat
• Spread / wheelbarrow labor — $40 to $80 per cubic yard

Bulk vs bagged — when does each win?

Bagged topsoil is the right call for anything under 1 cubic yard or when you can't fit a dump truck on the driveway. It's about 3 to 4 times more expensive per cubic foot but you avoid the delivery fee, you can buy as you go, and you don't need a shovel-and-tarp marathon. Bulk wins on every job from 2 cubic yards up — you'll spend roughly half as much per yard even after paying for delivery.

Topsoil vs garden soil vs fill dirt — pick the right one

• Topsoil — the top 6 to 10 inches of native soil, screened of rocks and roots. General-purpose for lawns, leveling, and filling planting holes.
• Garden soil — topsoil amended with compost and sometimes fertilizer. Use in vegetable beds and flower beds; do not use for leveling large areas (too rich, settles fast).
• Fill dirt — subsoil with no organic matter. Cheap, compacts well, use for raising grade or backfilling — never plant in it.
• Loam — the ideal topsoil texture (roughly 40% sand, 40% silt, 20% clay). Worth the premium for new lawns and beds.

How to measure your yard for topsoil

1. Walk the area with a tape or measuring wheel and break it into rectangles.
2. For an L-shape, measure each rectangle separately and add the square footage.
3. For circles, area = π × radius² (radius in feet).
4. Mark low spots with marking paint and estimate depth at the worst point.
5. Multiply each section by its target depth, run the formula, and sum the cubic yards.
6. Add 10% to the final total before ordering.

How to spread topsoil correctly

1. Mow existing grass short and dethatch if you're topdressing.
2. Loosen the surface 2 to 3 inches deep with a rake or tiller so the new soil bonds.
3. Dump topsoil in piles every 8 to 10 feet — easier than pushing one big pile.
4. Spread with a level rake or the back of a leaf rake — keep depth even.
5. Water lightly to settle, then check for low spots and top up.
6. Seed or sod within 48 hours so the surface doesn't crust.

Common mistakes that cost you a re-order

• Forgetting the 10% waste factor — half a yard short is a wasted Saturday.
• Measuring depth in feet instead of inches — the formula uses inches.
• Ordering fill dirt and trying to grow grass in it.
• Spreading topsoil over compacted clay without loosening — water will pool.
• Topdressing too thick (over 1/2 inch) — you'll smother the grass underneath.
• Not asking if the price is screened or unscreened — unscreened has rocks and roots.

FAQ

How much topsoil do I need for 1,000 square feet?

For a new lawn at 3 inches deep, you need 9.2 cubic yards (about 330 bags). For topdressing at 1/2 inch, you need 1.7 cubic yards. Both numbers include a 10% waste factor.

How much does a cubic yard of topsoil cover?

One cubic yard covers 324 sq ft at 1 inch deep, 162 sq ft at 2 inches, 108 sq ft at 3 inches, or 54 sq ft at 6 inches. Divide 324 by your target depth in inches to get coverage in square feet.

How many bags of topsoil are in a cubic yard?

About 36 bags — assuming the standard 0.75 cubic foot (40 lb) bag sold at Home Depot, Lowe's, and Menards.

How much does a cubic yard of topsoil weigh?

Dry screened topsoil weighs roughly 2,000 lb (1 ton) per cubic yard. Wet or compost-heavy mixes can hit 2,400 to 2,700 lb. Check your truck or trailer rating before hauling more than 1 yard.

How much topsoil do I need to level my yard?

Measure the depth of the deepest low spot in inches, multiply by the square footage of the low area, then divide by 324. For a typical yard with scattered dips, plan on 1 to 2 cubic yards per 1,000 sq ft.

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