Retaining Wall Design Calculator
Inputs
ft
IBC: >4 ft requires engineering; highway walls per AASHTO LRFD; typical gravity walls 4–8 ft, cantilever 8–20 ft
pcf
°
ASTM D3080: compacted sand 30–35°; gravel 35–42°; use 30° conservative for unknown backfill
psf
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
Active Pressure Coeff (Ka)0.33
Passive Pressure Coeff (Kp)3
Sliding Force2,000 lb/ft
Max Pressure at Base400 psf