How Much Rock Do I Need?
Standing in your yard with a tape measure, trying to guess how many tons of rock to order, is no way to start a project — order too little and you’re waiting on a second delivery, order too much and you’ve got a pile you didn’t pay to need. This guide shows you exactly how to figure it out, with a calculator that does the math and clear depth tips for every kind of project. When you’re ready to confirm, the team at Art Barber Excavating has delivered rock, decomposed granite, and sand across the Wickenburg area for more than 40 years — one call gets you an exact quote.
Art Barber Excavating · Wickenburg, AZ
How much material do you need?
Estimate the rock, decomposed granite, sand, or fill dirt for your project — then call us to lock in delivery.
Typical: 2–3" for rock ground cover, 4"+ for driveways & high-traffic areas.
Covering 200 sq ft at 3" deep. Estimates are a starting point — actual tonnage shifts with compaction, moisture, and material. We recommend ordering about 10% extra. Call us to confirm and schedule delivery.
How to measure the area you’re covering
Before the calculator can help, you need two numbers: the area you want to cover and how deep you want the material.
For a square or rectangular bed, measure the length and width in feet and the calculator does the rest. For a round area — a fire-pit surround or a circular planting bed — measure straight across the widest point to get the diameter, and switch the calculator to circle mode.
Got an irregular shape? Break it into simple rectangles and circles in your head, run each one through the calculator, and add the results together. It doesn’t need to be perfect — you’ll be ordering a little extra anyway.
The simple formula behind it
If you’d rather check the math yourself, here’s the standard formula every rock supplier uses:
Square feet × depth (inches) ÷ 324 = cubic yards
The 324 is just a conversion constant that turns square feet and inches of depth into cubic yards, which is how bulk rock is sold and delivered. A 200-square-foot bed at 3 inches deep works out to about 1.9 cubic yards. The calculator above runs this for you instantly so you never have to.
Coverage: how far does a cubic yard go?
A single cubic yard covers a different amount of ground depending on how deep you spread it — the deeper the layer, the less area one yard covers:
DEPTH
ONE CUBIC YARD COVERS ABOUT
1 inch
324 sq ft
2 inches
162 sq ft
3 inches
108 sq ft
4 inches
81 sq ft
6 inches
54 sq ft
So a yard of rock that blankets a big area at 2 inches will only cover half as much ground if you go to 4 inches deep.
How Deep Should The Rock Be?
Depth matters as much as area, and the right depth depends on what the surface is for:
- Decorative ground cover and planting beds: 2 to 3 inches — enough to look finished and suppress weeds without burying your budget.
- Over a weed barrier fabric: 2 to 3 inches is plenty, since the fabric is doing the weed control.
- Walkways and footpaths: about 3 inches, so the surface stays comfortable and doesn’t scatter underfoot.
- Driveways and high-traffic areas: 4 inches or more, usually over a compacted base. Decomposed granite and crushed material are the usual choices here.
When in doubt, 2 to 3 inches is the safe default for most residential landscaping.
Cubic yards or tons — which do I order?
You’ll see both. Cubic yards measure volume (how much space the rock takes up) and tons measure weight. Bulk rock is delivered by either one, so the calculator shows you both.
As a rule of thumb, a cubic yard of most landscaping rock weighs roughly 1.4 tons, though it varies with the material and how wet it is. Treat the tonnage as a close estimate and let us confirm the exact figure for the specific product you’re ordering.
Choosing the right size and type
The amount you need also depends on what you’re laying down, because different materials behave differently:
- 3/8-inch screened rock — the most popular all-purpose decorative rock for beds and ground cover: small, clean, and easy to spread.
- 3/4-inch to 1-inch rock — great on pathways and larger open areas; bigger stones stay put and don’t track into the house.
- Larger rock (1 to 3 inches and up) — best for drainage areas, slopes, and accent zones where you want texture rather than a walkable surface.
- Decomposed granite — contains fine particles that compact into a firm, natural-looking surface; the go-to for driveways, patios, and trails.
The short version: loose decorative gravel stays loose and drains well, which is what you want in a planting bed. Decomposed granite packs down hard, which is what you want underfoot.
Which colors suit Wickenburg homes?
Desert tones look most at home against Wickenburg’s natural landscape and the earthy stucco and adobe finishes common around town. Locally, the most popular choices are Sedona Red, Desert Sunset, and Santa Fe Beige. You can see the full color range on our decorative rock page.
Always order a little extra
Spread depth is never perfectly even, the ground is rarely perfectly flat, and a little settling is normal — so we recommend ordering about 10% more than the calculator’s exact figure. It’s far cheaper to have a little left over than to pay for a second delivery to finish the last few square feet.
Get an exact quote and schedule delivery
The calculator gets you a confident estimate; a quick conversation gets you the exact number and a delivery date. Art Barber Excavating has delivered rock, decomposed granite, arena sand, and fill dirt throughout Wickenburg, Congress, Morristown, Aguila, and the surrounding area for over 40 years — we know the roads, the access challenges, and the right material for the job.
Frequently asked questions
That depends on your project:
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½” to ¾” gravel is great for walkways and topdressing.
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1”–2” rock works well for general landscaping and beds.
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Larger boulders or rip rap are ideal for accent pieces or erosion control.
We can guide you based on your space and design goals.
A general rule is:
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1 ton of 1.5” rock covers about 90–100 square feet at a 2” depth.
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Smaller rock like ½” gravel covers a bit more.
We can help calculate your total based on square footage and desired depth—just give us a call or use our coverage estimator (coming soon to the site).
Measure length × width = square feet, then pick a depth. As a quick rule of thumb at 2″ depth:
½” rock ≈ 100–120 sq ft per ton
¾”–1″ rock ≈ 90–100 sq ft per ton
Use these to estimate, then call us to validate for your specific rock and application.
Material density varies by rock. Typical guides:
Landscape gravel ≈ 1.25–1.35 tons per cubic yard
Washed gravel ≈ 1.4–1.6 tons per cubic yard
Some decorative stones (e.g., specific ⅜” products) can be ~1.2 tons/yd³. Ask us for the best conversion for your exact rock.
⅜”–½” screened: planter beds, top-dress around plants, fine groundcover.
¾”–1″ screened: general yard cover, around hardscapes.
1–3″+ riprap: erosion control, washes, swales (size/specs vary; ADOT uses D50 gradations for design). Ask us for recommendations for your drainage speeds/slopes.
A good rule of thumb is to plan for about 1 ton of 3/4″ decorative rock per 100 square feet at a 2-inch depth. For a standard two-car driveway (roughly 20 x 40 feet), that’s around 8 tons. Decomposed granite driveways typically need a bit more material since it’s compacted down. When you call us, just tell us the length and width of your space and we’ll help you calculate the right amount so you’re not short or paying for more than you need.
The size affects both the look and the function. The 3/8″ screened rock is our most popular choice for residential landscaping beds and around plants — it lays flat, looks clean, and is comfortable to walk on. The 3/4″ rock is chunkier, so it works well for driveways, drainage areas, and anywhere you need a more rugged look or better water flow. We’re happy to walk you through which size makes the most sense for your specific project.
It depends on the square footage and depth you want. For most residential yards in Wickenburg, a 2–3 inch layer of decorative gravel is standard. Give us your square footage and we’ll calculate the tonnage for you — no guesswork on your end.
Desert-toned colors tend to complement Wickenburg’s natural landscape best. Our most popular choices locally are Sedona Red, Desert Sunset, and Santa Fe Beige — all of which pair beautifully with the earthy stucco and adobe finishes common throughout the area.
At a typical 3-inch depth, a 200-square-foot area needs about 1.9 cubic yards of rock, or roughly 2.6 tons. For a 2-inch decorative layer it’s closer to 1.2 cubic yards. Use the calculator above to match your exact size and depth.
It depends on depth and material, but a ton of landscaping rock (a little under a cubic yard) covers roughly 75 square feet at 3 inches deep, or about 110 square feet at 2 inches deep.
Two to three inches is right for most decorative beds and ground cover. Walkways do well around three inches, and driveways or high-traffic areas need four inches or more, usually over a compacted base.
Decomposed granite contains fine particles that let it compact into a firm surface, ideal for driveways, patios, and paths. Decorative gravel stays loose, drains freely, and suits planting beds and ground cover.
Yes. We deliver throughout the greater Wickenburg area, including Congress, Morristown, Aguila, and surrounding rural properties — including addresses off unpaved roads. We’ll talk through access when you call so we send the right equipment.