Porosity and Permeability Calculator

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Volume ratio: measure void volume and total volume. Density: measure bulk and grain (particle) density.
Darcy's law: requires a measured flow test. Kozeny-Carman: estimates from grain diameter and porosity, useful when no flow test is available.
Volume of pore space (air + water) inside the sample.
m³
Bulk volume of the sample including all pores and solids.
m³
Volume of fluid passing through the sample per second.
m³/s
Dynamic viscosity of the fluid. Water at 20°C is 0.001 Pa·s (1 mPa·s).
Pa·s
Length of the core or column in the direction of flow.
m
Cross-sectional area of the sample perpendicular to flow.
m²
Absolute fluid pressure at the upstream face of the sample.
Pa
Absolute fluid pressure at the downstream face of the sample (often atmospheric).
Pa
Hydraulic conductivity (K) depends on fluid viscosity and density. Select the relevant fluid or choose Custom.
Porosity (φ)High porosity
38%

Fraction of the total volume that is void space, expressed as a percentage

Void ratio (e)0.6129
Solid fraction0.62%
Permeability (k)10.1343×10⁻¹³ m²
Permeability in darcy1.0269D
Permeability in millidarcy1,026.86mD
Hydraulic conductivity (K)0m/s
Specific discharge (Darcy velocity)0.001m/s
38% fraction
Negligible<5%Low5%-15%Moderate15%-30%High30%-50%Very high50%+

Porosity is 38.00%, giving a void ratio of 0.613.

  • A porosity of 38.00% is high, characteristic of loose sand, silt, or clay-rich soils.
  • The void ratio of 0.613 means there are 0.613 units of pore space for every unit of solid grain volume.
  • Permeability of 1.03 D is good, typical of well-sorted sandstone or gravel.

Next stepPermeability was estimated using Darcy's law. For critical engineering decisions, validate with a laboratory constant-head or falling-head permeability test on an undisturbed sample.

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