Calculate the amount of rip rap rock needed for erosion control, shoreline protection, and drainage projects. Get accurate tonnage and cost estimates.
Ready to calculate
Enter your project dimensions
Light duty
Walkway borders, small channels
Standard
Most erosion control, drainage
Heavy duty
Shorelines, moderate slopes
Extra heavy
Steep slopes, high flow areas
Why expert review matters
Every calculator is reviewed by certified professionals to ensure accuracy.David Chen's Master Mason, Licensed GC certification ensures professional-grade precision.
How deep should rip rap be?
Typically 1.5-2x the largest rock diameter. 6-12" for most applications.
Do I need geotextile fabric?
Yes, highly recommended to prevent soil erosion beneath the rocks.
Limestone vs granite?
Granite is harder and more durable; limestone is more common and affordable.
Our rip rap calculator determines the volume needed based on your project dimensions, then converts to tonnage using the density of your selected rock size and material type. We add 10% for settling and voids between rocks. Delivery cost is estimated at $5/mile with a $75 minimum.
Formula
Volume (cu yd) = Length × Width × (Depth ÷ 12) ÷ 27
Tons = Volume × Density × 1.1 (settling factor)