Retaining Wall Design Calculator
Inputs
IBC: >4 ft requires engineering; highway walls per AASHTO LRFD; typical gravity walls 4–8 ft, cantilever 8–20 ft
ASTM D3080: compacted sand 30–35°; gravel 35–42°; use 30° conservative for unknown backfill
AASHTO: 250 psf highway live load; parking/storage 100–250 psf; no surcharge=0 psf
Tab to move between fields
Results
Total Active Force
2,000 lb/ft
Overturning Moment
6,667 ft·lb/ft
Identify Input Parameters
4 parameters
= Wall Height (H) = 10ft, Soil Unit Weight (γ) = 120pcf, Friction Angle (φ) = 30°, Surcharge Load = 0psf
= 4 input(s) provided
Calculate Total Active Force
Total Active Force
= 2000
= 2000
Calculate Overturning Moment
Overturning Moment
= 6667
= 6667
Calculate Active Pressure Coeff
Active Pressure Coeff = Ka
= 0.3333
= 0.3333
Calculate Passive Pressure Coeff
Passive Pressure Coeff = Kp
= 3
= 3