Riprap calculator
PROEstimate riprap for erosion control in cubic yards, tons and cost.
Short answer: cu yd = (L × W × depth/12) ÷ 27. Tons = cu yd × 1.5. 20 × 10 ft × 3" = 1.85 cu yd ≈ 2.78 tons. Enter your measurements above and the riprap 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?
Cubic yards
1.85
Tons
2.78
≈ 1.5 t/yd³
Est. cost
$125
How does the riprap calculator work?
cu yd = (L × W × depth/12) ÷ 27. Tons = cu yd × 1.5.
What does a worked example look like?
20 × 10 ft × 3" = 1.85 cu yd ≈ 2.78 tons.
What do people ask most?
›What depth for riprap for erosion control?
2–3" for decorative use; 4–6" for base or heavy traffic.
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.