Fracture toughness or resistance to fracture is the critical stress concentration factor of a crack that leads to fracture, while impact resistance refers to a material’s ability to withstand a sudden or impact load, even in the absence of cracks. Both properties are crucial for understanding the behavior of materials in real-world applications, allowing for better design of parts and components according to their intended function. There are some correlations between toughness and impact resistance (in the absence of cracks) for metals, despite this being a highly relevant topic in various fields of engineering and materials science. Understanding this interaction is fundamental for developing safer, more durable, and efficient materials that can be applied in a wide range of uses. In this study, extensive research will be conducted to collect empirical data on Charpy impact resistance, fracture toughness, and elastic modulus. Using this information, different correlation models will be applied to derive toughness values from Charpy and elastic modulus data. The purpose of this work is to evaluate the reliability and accuracy of the different correlation methods by comparing theoretical and experimental fracture toughness values. By calculating the relative error of each model for each studied material, it will be possible to assess the different estimates and analyze which type of material is best suited for their application.