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.
What should you read before you order materials?
Field notes from real jobs that explain the numbers behind this calculator.
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