Process Safety Calculations is an essential guide for process safety engineers involved in calculating and predicting risks and consequences. The book focuses on calculation procedures based on basic chemistry, thermodynamics, fluid dynamics, conservation equations, kinetics, and practical models. It provides helpful calculations to demonstrate compliance with regulations and standards such as Seveso directive(s)/COMAH, CLP regulation, ATEX directives, PED directives, REACH regulation, OSHA/NIOSH, and UK ALARP. The content covers risk and consequence assessment, stoichiometry, thermodynamics, stress analysis, and fluid-dynamics. Realistic engineering models are included with validation from CFD modeling and/or industry testing, making it a practical resource for readers. It introduces basic principles that govern process relationships in modern industry, helping the reader find and apply the right principles to specific problems.