What size stone should I use?
Class 1 (5-12") is common for small ditches. Class 2 (12-18") is for heavier flow. The depth should be at least 1.5x the max stone diameter.
Calculator
Enter your values
Results
Volume Needed
11.11 yd³
Estimated Weight
16.67 tons
Coverage Area
200.0 sq ft
Analysis
Interpretation of the current calculator output
Calculation Summary
The current inputs have been processed for the rip rap calculator. Review the results panel for the computed output and use the charts tab to compare the current values visually.
How to Read It
The main result shows the direct answer for your current inputs. Supporting sections below explain the method, example, and common questions so the result is easier to interpret.
How to Use
Step-by-step instructions
- 1Enter the length and width of the area to cover (feet).
- 2Enter the desired depth of the stone layer (inches).
- 3The calculator will estimate the cubic yards and tons needed.
Volume & Weight
Calculates the volume of stone required and converts to tons using an average loose density of 1.5 tons per cubic yard.
Volume = L × W × D, Weight = Vol × DensityVariables:
L, WArea dimensions (ft)DLayer depth (in)Density~1.5 tons/yd³Example
Drainage Ditch
Inputs:
Length:20 ft
Width:10 ft
Depth:18 in
Steps:
- 1.Volume = 20 × 10 × (18/12) = 300 cu ft
- 2.Cubic Yards = 300 / 27 = 11.11 cy
- 3.Weight = 11.11 × 1.5 = 16.67 tons
Result:
11.11 cy, 16.67 tons