Topsoil is sold by the cubic yard, and ordering the right amount depends almost entirely on the depth you need and the area you're covering. Too little topsoil leaves you with a thin layer that dries out fast and doesn't support strong root growth. This guide gives you the formula, a depth reference by project type, and worked examples for the most common topsoil jobs.
The Formula
Always add 10–15% to the result for settling — topsoil compresses 15–20% after spreading and watering.
Depth Chart by Application
| Application | Min. Depth | Recommended |
|---|---|---|
| New lawn — seeding | 3 in | 4–6 in |
| New lawn — sodding | 4 in | 4–6 in |
| Top dressing existing lawn | — | ¼–½ in |
| Raised vegetable garden bed | 8 in | 12 in |
| Raised flower bed | 6 in | 8–10 in |
| Grading / low spot repair | Variable | Match grade |
| Container planting / large pots | — | Full fill |
Worked Examples
1,000 sq ft lawn at 4 inches
(1000 × 4/12) ÷ 27 = 12.35 yd³
With 15% settling: order 14.2 yd³ → round up to 15 yards
4×8 ft raised garden bed at 12 inches
(4 × 8 × 12/12) ÷ 27 = 1.19 yd³
With 15% settling: order 1.37 yd³ → buy 1.5 yards or ~37 cu ft of bagged mix
20×50 ft yard top dressing at ¼ inch
(20 × 50 × 0.25/12) ÷ 27 = 0.77 yd³
One level yard of screened top dressing covers this — round up to 1 yd³
Topsoil for Lawns vs. Garden Beds
Lawn Topsoil
- • Screened loam or sandy loam
- • Well-draining, not too heavy
- • Low to moderate organic content
- • Often sold as "lawn mix" or "screened topsoil"
- • 4 inches minimum for healthy grass
Garden Bed Topsoil
- • Rich loam with added compost (20–40%)
- • High organic matter for plant nutrients
- • Good drainage + moisture retention
- • Often sold as "garden mix" or "planting mix"
- • 8–12 inches for vegetables
Calculate Your Topsoil Order
Enter your area's length, width, and depth. The calculator shows cubic yards and estimated weight in tons — with waste factor and a copyable summary you can send to your supplier.
Open the Topsoil Calculator →Frequently Asked Questions
How much topsoil do I need for a 1,000 sq ft lawn at 4 inches?
(1000 × 4/12) ÷ 27 ≈ 12.35 cubic yards. With 15% for settling, order about 14.2 cubic yards (typically 14–15 yards). At 6 inches deep for a new lawn from scratch, that same area needs ≈ 18.5 yd³ — order 21–22 yards.
How much topsoil do I need for a 4×8 raised garden bed?
At 12 inches deep: (4 × 8 × 12/12) ÷ 27 ≈ 1.19 cubic yards. With 15% for settling: 1.37 yd³. That's about 37 cu ft or roughly 19 × 2 cu ft bags. For a mix of topsoil and compost, split 60/40 or 50/50 — weigh your blend by the yard.
What is the difference between topsoil for a lawn vs. a garden bed?
Lawn topsoil can be relatively basic screened soil — good loam with decent drainage. Garden beds benefit from richer, more organic topsoil mixed with compost (at least 20–30% compost by volume). Always ask your supplier what's in the mix before ordering.
How deep should topsoil be for new sod?
Sod requires a minimum of 4 inches of quality topsoil for roots to establish. 6 inches is better in hot or dry climates. Shallow topsoil over compacted subsoil leads to poor root penetration and drought stress in summer.
How much topsoil settles after spreading?
Topsoil typically settles 15–20% after spreading and watering. If you need a finished 4-inch depth, apply 4.5–5 inches of loose material. Always order 10–15% more than your exact calculation to account for settling.
What does a cubic yard of topsoil weigh?
Dry topsoil weighs approximately 1.35 tons (2,700 lbs) per cubic yard. Wet or heavy clay topsoil can weigh 1.5–1.7 tons/yd³. Most suppliers quote delivery weight on the invoice — confirm expected weight before placing a large order.
Related Resources
- → Topsoil Calculator — cubic yards, tons, and waste factor
- → Mulch Calculator — estimate mulch for your new beds
- → Sand Calculator — level or amend soil with sand
- → Weight Converter — convert tons to cubic yards
How This Estimate Was Prepared
All volume estimates on this page use standard area and volume formulas — length × width × depth, converted to cubic yards by dividing by 27. A 15% settling factor is applied for topsoil because loose material compresses significantly after watering. Density figures (≈ 1.35 t/yd³ dry) reflect typical supplier bulk density ranges; wet or heavy clay soils will be heavier. Always confirm blend composition and weight with your supplier before delivery. Last reviewed: May 2026.
Disclaimer: All estimates are for planning purposes. Topsoil density varies by source, organic content, and moisture. Confirm weight and blend with your supplier before delivery.