Landscape rock calculator
Estimate landscape rock for beds, borders and ground cover. Returns cubic yards, tons and cost.
Short answer: cu yd = (L × W × depth/12) ÷ 27. Tons = cu yd × 1.4 (typical rock). 20 × 8 ft × 3" = 1.48 cu yd ≈ 2.1 tons. Enter your measurements above and the landscape rock calculator returns the quantity, unit conversions and an estimated cost instantly, in imperial or metric — no sign-up needed.
What do you need to measure?
What is the answer?
How does the landscape rock calculator work?
cu yd = (L × W × depth/12) ÷ 27. Tons = cu yd × 1.4 (typical rock).
What does a worked example look like?
20 × 8 ft × 3" = 1.48 cu yd ≈ 2.1 tons.
What do people ask most?
›How to calculate how much rock I need for landscaping?
Multiply length × width × depth (in feet), divide by 27 for cubic yards, then multiply by ~1.4 for tons.
›How deep should landscape rock be?
2–3" for decorative use; 3–4" if you want full ground coverage and weed suppression.
Which yard & landscape calculator should you use next?
Where can you learn more?
Read field notes on estimating and materials, or browse every calculator we make.
What should you read before you order materials?
Field notes from real jobs that explain the numbers behind this calculator.