// multi-utility computation suite · offline · instant · precise
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eng.coulombs-earth-pressure Calculator
Calculates lateral earth pressure coefficient (Ka) using Coulomb's method for retaining walls with wall friction and inclined backfill. Coulomb's Ka is larger than Rankine's when wall friction is included — it's more accurate for rough concrete or masonry walls.
Inputs
Phi Deg
Reference formula or conversion factor shown for context.
Delta Deg
Reference formula or conversion factor shown for context.
Alpha Deg
Reference formula or conversion factor shown for context.
Beta Deg
Reference formula or conversion factor shown for context.
H M
Vertical measurement. For health calculators, typically standing height without shoes.
Results
Coulomb Ka
Reference formula or conversion factor shown for context.
total active force Pa (kN/m)
The combined total across all inputs and components.
wall friction δ effect
Sample size or count used in the calculation.
Coulomb 1776 — Ka = sin²(φ)/[sin(α)·(√sin(α−δ)+√(sin(φ+δ)·sin(φ−β)/sin(α+β)))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.
force application
Recommended use case or application for this configuration or result.