This is a little book for students who wish to have the essential formulas and equations of geotechnical engineering in a single easily accessible source. In about 40 pages, the 100 most essential civil engineering formulas are listed. Unlike other large books on this topic, there is no need to go through hundreds of pages and thousands of formulas for the student to get the basic equations. The author has searched several books on engineering formulas and tables and selected only those equations which are essential to the student. The civil engineering formulas and equations listed in this book are useful for students and researchers in various fields including geotechnical engineering, soil mechanics and foundation analysis, etc. Only the most elementary and basic topics are covered including formulas for Unified Soil Classification System, Rock Classification System, Physical Properties of Soils, Index Parameters for Soils, Soil Indices, Engineering Properties of Soils, Shear Strength of Cohesive Soils, Shear Strength of Cohesionless Soils, The Static Cone Penetration Test (CPT), California Bearing Ratio (CBR), Soil Permeability, Expansive Soils, Liquefaction of Soils, Types of Footings, Foundation Stability Analysis, Eccentric Loading, Allowable Bearing Pressures, Settlement Analysis of Cohesive Soils, Three-Dimensional Settlement Analyses, The Coefficient of Consolidation, Settlement Analysis of Sands, Standard Penetration Resistance Methods, Piles, Pile Testing, and Pile Design, LateralPressures on Retaining Walls. This is the second book in this series and is dedicated to geotechnical engineering. Other volumes will follow in other areas of civil engineering.