This tutorial describes how to use Key TERRA-FIRMA to calculate volumes from ground models (.KGM files) and how to calculate cut and fill volumes between ground models. It assumes that you have completed the "Ground Modelling" tutorial or that you already have a good understanding of TERRA-FIRMA's ground modelling features. The tutorial goes on to explore the various ways to graphically present cut and fill data using TERRA-FIRMA's contouring and elevation analysis tools.