Soil Hydraulic Properties Calculator

% Sand
% Clay
Sand (%)
Clay (%)
Wilting point
Field capacity
Bulk density

Available water


Wilting Point
is the water content at a matric potential of -1,500 kPa (-15 bars). It roughly corresponds to the lower limit of the Available water. It is expressed in (units³ water/units³ soil).
Field Capacity
is the water content at the upper limit of the Available Water or drained upper limit. It roughly corresponds to a matric potential of -30 kPa (-0.3 bars) in most soils and to -10 kPa (-0.1 bars) in sandy soils. It is expressed in (units³ water / units³ soil).
Available Water (AW)
AW = (FC - PWP) It is expressed as percent water.
Bulk density (BD)
BD = (1 - saturation) * 2.65 Bulk density is used in determining soil porosity. It is expressed in grams of soil mass per cubic centimeter of soil volume.
Source: K.E. Saxton et al., 1986, Estimating generalized soil-water characteristics from texture. Soil Sci. Soc. Amer. J. 50(4):1031-1036