For a standard 3-inch depth, the quick formula is: multiply the length and width of your space in feet, multiply that by the depth in inches, then divide by 324 to get cubic yards — multiply the cubic yards by 1.3 to get tons. A typical 800 sq ft Eagle Mountain yard at 3 inches deep needs about 10 tons of rock. If you’re staring at a fresh-graded lot in The Ranches or a bare City Center yard trying to guess how much to order, this guide walks through the exact math with real Eagle Mountain project examples, so you order it right the first time.
A lot of Eagle Mountain properties are new construction — which means there’s often no existing landscaping to eyeball or compare against, just bare, freshly graded dirt. That makes visual guessing especially unreliable here compared to an established yard where you can at least see what a finished bed or path looks like. Bulk rock is also sold by the ton, not by the bag, which is great for your budget but means the estimate needs to be reasonably accurate before you call. And because DIY Landscape Supply is delivery-only — there’s no yard to swing by and grab an extra bag — a mis-order means scheduling a second truck instead of a five-minute run to the store.
The math is the same no matter what you’re building:
Volume (cubic yards) = Length (ft) × Width (ft) × Depth (inches) ÷ 324
Tons = Cubic Yards × Weight Factor (typically 1.2–1.4 for decorative rock)
The ÷ 324 converts your measurement into cubic yards (27 cubic feet per cubic yard, 12 inches per foot, so 27 × 12 = 324). The weight factor accounts for how dense the specific rock is — gravel, pea gravel, and cobble all pack differently.
| Depth | Coverage per Ton | Recommended Use |
| 2 inches | ~80–90 sq ft | Pathways, ground cover |
| 3 inches | ~55–65 sq ft | Garden beds, borders |
| 4 inches | ~40–50 sq ft | Xeriscape, weed suppression |
| 6 inches | ~25–30 sq ft | Drainage, driveway base |
Here’s how the math plays out on four projects that come up constantly in Eagle Mountain, from bare new-construction lots to established beds.
A lot of Eagle Mountain homeowners are landscaping a bare, freshly graded lot from scratch — front and back, all at once. For a 1,000 sq ft front yard at a 3-inch depth:
Many Ranches-area lots are graded with slopes that need a rock swale or border to manage runoff. For a 60-foot swale, 3 feet wide, at a 6-inch depth:
A lot of Eagle Mountain properties still have unpaved driveways that need a road base layer. For a 40-foot by 12-foot driveway apron at a 4-inch depth using Commercial Road Base (denser, ~1.4 weight factor):
Smaller City Center lots often just need a clean decorative border rather than full-yard coverage. For a 30-foot border, 2 feet wide, at a 2-inch depth using Lavender Cobble:
Not all rock weighs the same, and the product you pick shifts the math. Here’s how the products Eagle Mountain homeowners order most often compare:
When in doubt, round up 10–15%. Rock settles after installation, especially on a freshly graded lot where the base underneath hasn’t fully compacted yet.
Bagged rock from a hardware store can run two to four times the cost per ton compared to bulk pricing — and Eagle Mountain’s newer subdivisions tend to sit on larger lots than the denser, older suburbs closer to Salt Lake City. Once a project crosses even half a ton, bulk almost always wins on price, and full-yard new-construction projects here routinely run 10, 20, even 40+ tons. Hauling that in bags isn’t just expensive, it’s not realistic. DIY Landscape Supply delivers straight to your property throughout Eagle Mountain — The Ranches neighborhoods near Redwood Road and Porter’s Crossing, City Center near SR-73, and all 84005 addresses — in a single load, with orders of 10+ tons/yards shipping at a flat $75 delivery fee.
Now that you know how to run the numbers, ordering is the easy part. DIY Landscape Supply delivers bulk decorative rock, gravel, pea gravel, and cobble straight to your Eagle Mountain property — no yard pickup, no guessing, no hauling.
Call or text DIY Landscape Supply at (385) 321-3341 or order online at diylandscape.supply — serving Eagle Mountain, including The Ranches, City Center, and all 84005 addresses.
Q: How much landscape rock do I need for a 1,000 sq ft area?
A: At a standard 3-inch depth, 1,000 sq ft needs about 9.3 cubic yards, or roughly 12 tons. Use the formula: 1,000 × 3 ÷ 324 = 9.3 cubic yards × 1.3 = ~12 tons. Round up to 12–13 tons to be safe.
Q: What’s the minimum order for bulk rock delivery in Eagle Mountain?
A: Most bulk suppliers, including DIY Landscape Supply, typically start delivery minimums around 1 ton. It’s worth calling to confirm current minimums for your specific Eagle Mountain address.
Q: Is bulk rock cheaper than bagged rock from a hardware store?
A: Almost always — bagged rock can cost two to four times more per ton than bulk pricing once you’re ordering more than about half a ton. For anything beyond a small border, bulk delivery is the better value.
Q: What depth should I use for a new-construction, bare-dirt yard?
A: Most Eagle Mountain new-construction xeriscape projects use 3–4 inches, with 4 inches preferred where weed suppression is the priority on freshly cleared ground. Pair it with weed barrier fabric underneath for the best long-term result.
Q: How do I calculate rock for an irregular-shaped yard?
A: Break the space into simpler shapes — rectangles, triangles, circles — calculate each one separately, then add them together. For circles, use Area = 3.14 × radius².
Q: Does rock type change how many tons I need?
A: Yes. Lighter materials like Black Lava Rock need more volume for the same weight, while denser materials like Commercial Road Base pack heavier per cubic yard. Confirm the weight factor for your specific product when you call.
Q: Can I use this formula for a dirt driveway in Eagle Mountain?
A: Yes — use a deeper depth (4–6 inches is standard for driveways) and account for the denser weight factor of Commercial Road Base or Construction Gravel, both common choices for Eagle Mountain’s unpaved driveways.