Soil gravimetric water content
User-supplied measurements and assumptions; Water content = mass of water / oven-dry solids; subtract container mass from dry sample.
Geotechnical laboratory arithmetic ↗Geotechnical laboratory arithmetic calculators
25 calculators. Search or choose one below.
Calculators
Soil bulk dry density
User-supplied measurements and assumptions; Bulk density=wet mass/volume; dry density=bulk density/(1+water content fraction).
Geotechnical laboratory arithmetic ↗Soil void ratio porosity
User-supplied measurements and assumptions; Void ratio=particle density/dry density−1; porosity=e/(1+e).
Geotechnical laboratory arithmetic ↗Soil degree of saturation
User-supplied measurements and assumptions; Saturation fraction = water content fraction × particle specific gravity / void ratio; values above 100% explicitly flagged.
Geotechnical laboratory arithmetic ↗Soil particle specific gravity
User-supplied measurements and assumptions; Gs=(soil dry mass)/(soil dry mass + water-only filled mass − soil/water filled mass), no temperature correction beyond entered density.
Geotechnical laboratory arithmetic ↗Soil sieve analysis reduction
User-supplied measurements and assumptions; Cumulative retained uses initial dry mass, including pan only in mass balance; descending sieve openings required.
Geotechnical laboratory arithmetic ↗Soil gradation coefficients
User-supplied measurements and assumptions; Interpolate log(diameter) linearly against percent passing; Cu=D60/D10, Cc=D30²/(D10D60).
Geotechnical laboratory arithmetic ↗Soil corrected-depth Stokes particle size
User-supplied measurements and assumptions; Stokes isolated-sphere settling: D=√(18μL/((ρsolid−ρfluid)gt)); effective depth supplied after instrument corrections.
Geotechnical laboratory arithmetic ↗Soil liquid limit flow curve
User-supplied measurements and assumptions; Least-squares water content versus log10(blows); liquid limit is predicted water content at 25 blows.
Geotechnical laboratory arithmetic ↗Soil plasticity index
User-supplied measurements and assumptions; Plasticity index=liquid limit−plastic limit; explicitly flag reversed limits.
Geotechnical laboratory arithmetic ↗Soil liquidity index
User-supplied measurements and assumptions; Liquidity=(w−PL)/(LL−PL), consistency=(LL−w)/(LL−PL); LL must exceed PL.
Geotechnical laboratory arithmetic ↗Soil compaction curve fit
User-supplied measurements and assumptions; Least-squares quadratic fit; report concave-down vertex only inside observed moisture range, not an extrapolated optimum.
Geotechnical laboratory arithmetic ↗Soil relative compaction
User-supplied measurements and assumptions; Field dry density/reference maximum dry density ×100; no acceptance criterion assumed.
Geotechnical laboratory arithmetic ↗Soil relative density
User-supplied measurements and assumptions; Relative density=(emax−e)/(emax−emin); require current e between supplied extremes.
Geotechnical laboratory arithmetic ↗Soil falling-head permeability
User-supplied measurements and assumptions; Falling-head k=(standpipe area×sample length)/(sample area×time)×ln(initial head/final head).
Geotechnical laboratory arithmetic ↗Soil constant-head permeability
User-supplied measurements and assumptions; Constant-head k=volume×length/(area×head difference×time).
Geotechnical laboratory arithmetic ↗Soil consolidation settlement worksheet
User-supplied measurements and assumptions; Normally consolidated one-dimensional settlement=H×Cc/(1+e0)×log10(σfinal/σinitial).
Geotechnical laboratory arithmetic ↗Soil consolidation time factor
User-supplied measurements and assumptions; Tv=cv×time/drainage-path-length²; drainage path is supplied, not inferred from layer thickness.
Geotechnical laboratory arithmetic ↗Soil oedometer compression index
User-supplied measurements and assumptions; Fit void ratio against log10(effective stress) over user-selected virgin compression range; Cc=−slope.
Geotechnical laboratory arithmetic ↗Soil direct shear envelope
User-supplied measurements and assumptions; Mohr-Coulomb least-squares line τ=c+σnormal×tanφ; outputs are apparent fitted parameters.
Geotechnical laboratory arithmetic ↗Soil triaxial principal stress
User-supplied measurements and assumptions; Axisymmetric triaxial compression: σ3=cell pressure, q=force/corrected area, σ1=σ3+q, p=(σ1+2σ3)/3.
Geotechnical laboratory arithmetic ↗Soil effective stress profile
User-supplied measurements and assumptions; Integrate total unit weight by layer; hydrostatic pore pressure below supplied water table; effective stress=total−pore.
Geotechnical laboratory arithmetic ↗Soil capillary rise idealization
User-supplied measurements and assumptions; Jurin ideal circular capillary: h=2γcosθ/(ρgr); negative values represent capillary depression.
Geotechnical laboratory arithmetic ↗Soil sand-cone density reduction
User-supplied measurements and assumptions; Hole volume=corrected sand mass/sand density; field soil mass/volume; dry density adjusts water content.
Geotechnical laboratory arithmetic ↗Soil sample recovery ratio
User-supplied measurements and assumptions; Recovered length/drilled advance ×100; no RQD or fracture-quality inference.
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