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Concrete Volume Calculator
Estimate concrete volume for slabs, footings, pads, and other rectangular placements.
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Bearing Capacity Calculator
Screen shallow foundation bearing capacity using a Terzaghi-style calculation.
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Footing Size Calculator
Size square, rectangular, or continuous strip footings from service load and allowable soil bearing pressure.
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Footing Contact Pressure Calculator
Calculate biaxial corner pressures, eccentricities, kern status, and allowable-pressure utilization for a rigid rectangular footing.
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Elastic Settlement Calculator
Estimate immediate shallow-foundation settlement using net pressure, footing width, soil modulus, Poisson ratio, and an engineer-selected influence factor.
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Axial Pile Capacity Calculator
Combine project-specific average shaft and toe resistances to estimate ultimate and allowable compression capacity for one circular pile.
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Lateral Earth Pressure Calculator
Estimate active, at-rest, or passive lateral earth pressure for simple drained backfill cases.
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Infinite Slope Factor of Safety Calculator
Calculate infinite-slope factor of safety from slope angle, soil thickness, unit weight, cohesion, friction angle, and pore-pressure ratio.
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Retaining Wall Pressure Calculator
Estimate active retaining wall pressure, surcharge contribution, and drainage sensitivity.
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Manning's Equation Calculator
Calculate open-channel velocity and discharge from area, hydraulic radius, slope, and Manning roughness.
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Soil Classification Helper
Screen a preliminary USCS soil group using gradation percentages and Atterberg limits.
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Percent Compaction Calculator
Calculate field dry density, percent compaction, density acceptance, and moisture-band status from field and Proctor test data.
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Proctor Curve Calculator
Convert wet-density test points to dry density, plot the moisture-density relationship, and estimate optimum moisture content and maximum dry density.
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Unit Weight / Density Converter
Convert pcf to kN/m3 and between lb/ft3, kg/m3, Mg/m3, g/cm3, and N/m3 for soil unit weight and mass density calculations.
Unit converter
Length and Displacement Converter
Convert engineering lengths and displacements between metric and US customary units.
Unit converter
Area Converter
Convert surface area between square metric units, square US customary units, hectares, and acres.