There are basically only two types of trimming calculations. Other trimming calculations are just variations of these two fundamental types. In Case I you know the vessel's weight and center of gravity (CG) location and you seek to find the forward and after drafts. In Case II you know the forward and after drafts and desire to know the vessel's weight and center of gravity (CG) location. The simple approach that is presented here should be readily understandable by anyone with a basic understanding of algebra and geometry