The article presents alternative methods for evaluating the cetane number of biodiesel, which is crucial for assessing its quality and performance in diesel engines. The standard methods, ASTM D613 and ISO 5165, are time-consuming and challenging to implement, often influenced by environmental factors. To address these issues, the authors propose three alternative techniques: color indicator titration, aniline point, and fatty acid composition-based methods. These methods are designed to be simpler and more practical, especially when engine-based measurements are not feasible. The reported values from these alternative methods meet the minimum cetane number requirements set by ASTM D6751 (≥47) and show minimal variation from standard methods. However, these techniques are specific to biodiesel and may not be applicable to other biofuels due to their reliance on the unique characteristics of fatty acid profiles. The article concludes by highlighting the benefits of these alternative methods and their potential to simplify the evaluation of biodiesel cetane number.The article presents alternative methods for evaluating the cetane number of biodiesel, which is crucial for assessing its quality and performance in diesel engines. The standard methods, ASTM D613 and ISO 5165, are time-consuming and challenging to implement, often influenced by environmental factors. To address these issues, the authors propose three alternative techniques: color indicator titration, aniline point, and fatty acid composition-based methods. These methods are designed to be simpler and more practical, especially when engine-based measurements are not feasible. The reported values from these alternative methods meet the minimum cetane number requirements set by ASTM D6751 (≥47) and show minimal variation from standard methods. However, these techniques are specific to biodiesel and may not be applicable to other biofuels due to their reliance on the unique characteristics of fatty acid profiles. The article concludes by highlighting the benefits of these alternative methods and their potential to simplify the evaluation of biodiesel cetane number.