Porosity and Permeability Calculator
Free calculate porosity, void ratio, effective porosity, and permeability of soil and rock materials.
Input Parameters
Leave empty to calculate from V_v and V_t
For effective porosity calculation
Results
Enter volumes to calculate properties
Porosity and Permeability Formulas
Porosity (n)
n = V_v / V_t
Void Ratio (e)
e = V_v / V_s
e = n / (1 - n)
Effective Porosity (n_e)
n_e = V_vc / V_t
Where V_vc = volume of connected voids
Typical Values
Sand: 30-50%, Clay: 40-70%, Gravel: 20-40%