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sci.Rankine-earth-pressure Calculator
Calculates active and passive earth pressure coefficients Ka = tan²(45−φ/2) and Kp = tan²(45+φ/2) from soil friction angle for a vertical, smooth retaining wall. Active pressure Ka ≈ 0.33 for dense sand (φ=30°) — this is the minimum state; passive Kp = 3.0 is the maximum before wall yield.
Inputs
H M
Vertical measurement. For health calculators, typically standing height without shoes.
Phi Deg
Reference formula or conversion factor shown for context.
C Kpa
Reference formula or conversion factor shown for context.
Gamma Knm3
Body or object weight. For health calculators, usually in kg or lbs.
Delta Back Deg
Reference formula or conversion factor shown for context.
Results
active pressure Pa (kN/m)
Sample size or count used in the calculation.
passive pressure Pp (kN/m)
Sample size or count used in the calculation.
active pressure coeff Ka
Reference formula or conversion factor shown for context.
passive pressure coeff Kp
Reference formula or conversion factor shown for context.
Ka = tan²(45°−φ/2) | Kp = tan²(45°+φ/2)
Sample size or count used in the calculation.
Coulomb vs Rankine
The position in an ordered list, from best to worst or lowest to highest.