Slope & Grade Calculator
Calculate slope percentage and determine if a retaining wall may be needed.
Results
Slope
20.0%
Grade Ratio
1:5.0
Angle
11.3°
Steep Slope
Terracing or drainage solutions may be recommended for this slope.
Methodology & Notes
Slope (%) = (rise / run) x 100. As a general rule, slopes above 30% benefit from a retaining wall for stability and erosion control. Slopes of 15-30% may need terracing solutions. Final assessment depends on soil type and drainage conditions.
Get an Accurate Free Estimate
These calculators provide rough estimates. For an exact price, call us or send photos of your project.