Riprap calculator
PROEstimate riprap for erosion control in cubic yards, tons and cost.
Inputs
Result
Cubic yards
1.85
Tons
2.78
≈ 1.5 t/yd³
Est. cost
$125
The formula
cu yd = (L × W × depth/12) ÷ 27. Tons = cu yd × 1.5.
Worked example
20 × 10 ft × 3" = 1.85 cu yd ≈ 2.78 tons.
Frequently asked
›What depth for riprap for erosion control?
2–3" for decorative use; 4–6" for base or heavy traffic.