Excel @RISK is a helpful modeling tool used to analyze under uncertain and risky conditions. This paper aims to provide a starting resource for the use of @RISK analysis and allow readers the ability to make more productive and insightful business decisions. This paper covers the fundamentals of concepts such as simulation, measuring correlations, parent distributions, time series modeling, analysis tools and NPV analysis. This tutorial guide is intended to provide a detailed resource for the conceptual understanding and practical application of @RISK modeling.