A reliable assessment of immediate and long-term deflections of concrete floors is the primary consideration for in-service design of concrete floors. Prediction of probable deflections is a routine challenge for structural concrete design engineers. This webinar provides the knowledge and numerical examples necessary for estimating a concrete floor’s deflection in the environment of an everyday consulting office. The webinar covers the recommended code limits and their application to practical conditions. Starting with a review of the simplest method of estimating deflections, the discussion moves progressively to more rigorous schemes, and concludes with the practical application of the Finite Element Method. It covers the consideration of crack formation and its impact on a concrete floor’s deflection, a critical consideration for conventionally reinforced slabs. Crack width calculation, where applicable, is also discussed. Detailed numerical examples illustrate the application of each of the methods presented. A comparative evaluation of different methods illustrates the merits of each method. The webinar also covers the application of post-tensioning to concrete floors.