How Much Landscape Material Do I Need? Tons, Yards & Coverage Made Simple

To estimate landscape material, multiply the area’s length × width in feet, then multiply by depth in feet (inches ÷ 12) to get cubic feet, and divide by 27 for cubic yards. One cubic yard of most rock weighs 1.2–1.4 tons; soil and sand run similar; mulch is far lighter. As a shortcut: one ton of typical landscape rock covers about 80–100 square feet at 2 inches deep. Or skip the math entirely — call Kilgore Landscape Center in West Jordan with your measurements and we’ll calculate your exact load.

“How much do I need?” is the single most common question asked at our counter — and ordering wrong in either direction hurts. Too little means a second delivery fee and a half-finished weekend. Too much means a rock pile living on your driveway until Labor Day. This guide gives you the same math we use at the yard, in plain English.

Step 1: Measure Your Area (The Honest Way)

Grab a tape measure — don’t eyeball it. For rectangles, it’s length × width. For odd shapes, break the space into rectangles and triangles (triangle area = base × height ÷ 2) and add them up. For circles, radius × radius × 3.14.

West Jordan pro tip: park strips are the most-measured spaces in the valley thanks to grass-removal conversions. A typical park strip runs about 4–5 feet wide; measure yours end to end and you’re 30 seconds from a materials number.

Step 2: Pick Your Depth

Depth is where most estimates go wrong. Use these standards:

Step 3: Do the Conversion

The universal formula:

Length (ft) × Width (ft) × Depth (ft) ÷ 27 = cubic yards

Remember to convert inches to feet first: 2" = 0.167 ft, 3" = 0.25 ft, 4" = 0.333 ft.

Worked example — a West Jordan park strip:

• 40 ft long × 4.5 ft wide = 180 sq ft
• At 3" of rock: 180 × 0.25 = 45 cubic feet
• 45 ÷ 27 = 1.67 cubic yards
• Rock at ~1.3 tons per yard ≈ 2.2 tons

Step 4: Convert Yards to Tons (When Buying Rock)

Rock, sand, and gravel are usually sold by the ton; soil, mulch, and compost by the cubic yard. Approximate conversions:

That lava rock line isn’t a typo — see our black lava rock guide for why the lightweight stone changes the math.

Quick-Reference Coverage Chart (Per Ton of Rock)

Shopping for the rock itself? Compare chips, gravels, and specialty stones in our rock and sand collection, soils and mulches in our soil, compost, and mulch collection, and feature stones in our boulder collection — boulder tonnage is its own conversation, and we’re happy to have it by phone.

The 10% Rule (And When to Break It)

Add roughly 10% to any calculation for settling, uneven grade, and edge losses. Break the rule and order extra when: your area has curves (waste climbs), your ground is freshly excavated (materials settle into soft soil), or you’re matching an existing rock (batches vary — get it all in one load).

For lawn or garden projects where soil quality matters as much as quantity, USU’s Analytical Laboratories offers inexpensive home soil testing that tells you what your clay actually needs before you buy amendments.

The Easiest Method: Let Us Do It

Here’s the truth — you don’t have to do any of this. Call Kilgore Landscape Center with your length, width, and what you’re building. We calculate loads for Salt Lake Valley yards every single day, we know how our specific materials spread, and we’ll quote tonnage, price, and a delivery window in one phone call. There’s no online checkout for bulk materials, and that’s by design: a two-minute conversation prevents the two most expensive words in landscaping — “not enough.”

Frequently Asked Questions

How much area does a ton of landscape rock cover? About 80–100 square feet at 2 inches deep, or 60–75 square feet at 3 inches. Lightweight lava rock covers roughly double those figures.

How many tons of rock do I need for a park strip? A typical 40-ft Salt Lake Valley park strip at 3" deep needs about 2–2.5 tons of standard rock. Measure yours and call — we’ll confirm in seconds.

Is it cheaper to buy rock by the ton or by the bag? By the ton, dramatically. Bagged rock at big-box stores often costs three to five times more per pound than bulk material loaded at our West Jordan yard.

How much topsoil do I need for a new lawn? Plan 4–6 inches of quality screened topsoil. For a 1,000 sq ft lawn at 4", that’s about 12.3 cubic yards.

What if I order too much or too little? Call us either way. We’d rather help you fine-tune a second small load than have you guess — and if you calculate with us up front, you’ll almost never need to.

Bring Us Your Measurements — Leave With a Plan

Call Kilgore Landscape Center or visit our West Jordan, Utah yard with your project dimensions. We’ll run the math, check stock, and schedule pickup or delivery anywhere in Salt Lake County — usually before you’ve finished your coffee.

Sources

1. Utah State University Extension — Using Mulches in Utah Landscapes and Gardens (application depths): extension.usu.edu (PDF)
2. Utah State University Analytical Laboratories — Home Soil Testing: usu.edu/analytical-laboratories