This document discusses belt conveyor design and calculations. It provides guidelines for belt thickness and idler spacing based on material density being conveyed. It also outlines the equations needed to calculate the mass of the belt, idlers, and material per unit length, which are required for power calculations. These include factors like the number of idlers per side, mass of individual idlers, belt thickness and density, and flow rate and velocity of the material being conveyed. An example problem is provided to demonstrate how to apply these calculations.