Civil Geo Tools
Practical Civil & Geotechnical Engineering Tools
Free calculators, worked examples, and plain-English guides for soil mechanics, foundations, slopes, retaining walls, drainage, and civil engineering design.
Popular calculators
Practical tools for common calculations
Civil Engineering
Concrete Volume Calculator
Estimate concrete volume for slabs, footings, pads, and other rectangular placements.
Geotechnical Engineering
Bearing Capacity Calculator
Screen shallow foundation bearing capacity using a Terzaghi-style calculation.
Geotechnical Engineering
Lateral Earth Pressure Calculator
Estimate active, at-rest, or passive lateral earth pressure for simple drained backfill cases.
Geotechnical Engineering
Infinite Slope Factor of Safety Calculator
Screen shallow translational slope stability with an infinite slope model.
Geotechnical Engineering
Retaining Wall Pressure Calculator
Estimate active retaining wall pressure, surcharge contribution, and drainage sensitivity.
Drainage and Hydrology
Manning's Equation Calculator
Calculate open-channel velocity and discharge from area, hydraulic radius, slope, and Manning roughness.
Geotechnical Engineering
Soil Classification Helper
Screen a preliminary USCS soil group using gradation percentages and Atterberg limits.
Engineering Calculators
Unit Weight / Density Converter
Convert common soil and material density or unit weight values between pcf, kN/m3, and kg/m3.
Geotechnical Engineering Guides
Soil mechanics, foundations, slopes, retaining walls, drainage, and site investigation topics.
Civil Engineering Worked Examples
Step-by-step calculations that show formulas, units, assumptions, and checks.
For Homeowners & Contractors
Plain-English explanations of cracks, drainage, retaining walls, erosion, and soil reports.
PE/FE Exam Prep
Formula sheets and exam-focused explanations for core civil and geotechnical topics.
Latest articles
Reviewed engineering references
CBR Test Explained
CBR test explained for pavement subgrade and base support evaluation.
civil engineeringCompaction Testing Explained
Compaction testing explained for field density, moisture control, and earthwork quality.
civil engineeringConcrete Volume Calculation
Concrete volume calculation explained for slabs, footings, and rectangular placements.
civil engineeringCulvert Sizing Basics
Culvert sizing basics, including inlet control, outlet control, slope, tailwater, and debris.
civil engineeringHow to Estimate Concrete for a Slab
How to estimate concrete for a slab with thickness, waste factor, and field tolerance checks.
civil engineeringManning's Equation Explained
Manning's equation explained for open channel flow, velocity, discharge, roughness, and slope.
Downloadable Templates
Calculation sheets, checklists, and PE/FE reference downloads built for practical review and record keeping.
Free Civil & Geotechnical Formula Sheet
Get practical formulas, unit reminders, and calculator updates as the library grows.