One of the most important soil aggregate properties is relative density.
The relative density of soil is used to describe the state of compactness of granular material and is generally qualitatively described as very loose, loose, medium dense, dense, and very dense. The current tool uses N SPT number and theoretical correlations to define relative density of soil.

This tool estimates the unit weight of soil from N SPT number based on available literature correlations and tables. The unit weight of soil, also known as bulk density, is defined as the weight per unit volume of soil. It represents the average weight of soil particles, including solids and voids, within a given volume. The unit weight of soil is expressed in terms of mass per unit volume. It can vary depending on several factors, including the type of soil, its gradation, moisture content, compaction, and the presence of organic matter or other constituents.

This current tool estimates the modulus of elasticity or Young's modulus of soil based on theoretical correlations with N SPT number. Correlations available on this tool are mainly based on recommendations from the Foundation Analysis and Design book from Bowles (5th Edition, 1997). The tool also allows for estimating Young's modulus as an average value from multiple correlations (ie. selecting correlations for gravelly sand and saturated sand and averaging between the two).

Lateral earth pressure is the pressure that soil exerts in horizontal direction. It affects the design of retaining walls, basements, tunnels and deep foundations. Current tool estimates the earth pressure at rest , active and passive earth pressure coefficient based on Jaky's formula and Rankine Earth Pressure Theory.