Engineering Calculators
Each calculator includes inputs, formulas, steps, assumptions, related tools, and a professional engineering disclaimer.
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.