📐 AASHTO / Converse-Labarre Formula (Pile Group Efficiency Factor η & Settlement)

Pile Group Settlement & Efficiency Calculator

Calculate pile-soil-pile interaction and capacity reduction factors for closely spaced pile groups under AASHTO & IBC Chapter 18: calculate group efficiency factor (η using the Converse-Labarre empirical formula based on pile spacing 2.5D to 4.0D and row/column counts in a rigid cap), consolidate long-term deep group settlement, and foundation engineering margins.

1. Project & Operating Inputs

Foundation Pile Caps Analyzed (Cap Count e.g. 24 Structural Caps)

Center-to-Center Pile Spacing (Pile Diameters e.g. 3.0D Spacing)

Customer Bid Price for Geotechnical Modeling & PDA Load Testing ($)

Pile Driving Analyzer (PDA), High-Strain Gages, Geotechnical PE Sign-Off ($)

2. Financial Breakdown & Yield

CONVERSE-LABARRE PILE GROUP

Turnkey Foundation Engineering Profit

Geotechnical Consulting Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost