This document discusses techniques for calculating ballast water volume using sounding table extrapolation. It describes how duty officers currently use sounding tables and corrections to determine ballast water levels, but this can be inaccurate for over-trimmed vessels. The research aims to verify if extrapolating sounding table data using equations can more accurately calculate ballast tank capacities. The results showed that sounding table data can be converted to equations incorporating trim levels. Extrapolating this data using midpoint values produced errors of zero, providing an accurate method for determining ballast water volumes.