Rock Calculator
Estimate landscaping rock by cubic yard and by ton for any rock type.
Assumed density: 2,700 lbs/cu yd. Actual density varies by supplier and moisture content.
You need approximately
3.67 tons
- Recommended with 10% waste
- 2.72 cu yd
- Cubic yards (no waste)
- 2.47 cu yd
- Area
- 200 sq ft
Estimated material cost
$147
How we calculate this
Rock volume follows the same length × width × depth ÷ 27 formula as any bulk material. Since rock is sold by weight, we convert cubic yards to tons using a material-specific density — pea gravel and decorative rock run lighter, while crushed stone and rip rap run heavier.
Example
Measuring tips
For decorative rock beds and borders, 2–3 inches of depth is typical. For a walkway or driveway base layer, 4–6 inches is standard — pick your rock type above to get the right density for the conversion.
Common mistakes
- Assuming all rock types weigh the same — pea gravel and crusher run have noticeably different densities.
- Not accounting for a landscape fabric barrier, which affects how much rock settles over time.
- Ordering by the bag for a large area when bulk delivery by the ton is far cheaper per unit.
Frequently asked questions
How much does a cubic yard of rock weigh?
Roughly 2,400–3,000 lbs (1.2–1.5 tons) depending on the rock type — denser materials like crusher run weigh more than lighter decorative rock.
What rock type should I use for a landscaping bed?
Pea gravel and river rock are the most common decorative choices — see the Pea Gravel Calculator and River Rock Calculator for type-specific guidance.
Related calculators
Gravel Calculator
Estimate gravel, crushed stone or rock needed by cubic yard and by ton.
Stone Calculator
Estimate landscaping stone including flagstone, river rock and rip rap.
Pea Gravel Calculator
Estimate pea gravel for paths, play areas and ground cover.
River Rock Calculator
Estimate river rock for borders, dry creek beds and drainage features.
Estimates are provided for planning purposes. Actual material requirements may vary based on supplier specifications, compaction, site conditions, installation method, waste, and local code.