Bamboo is a sustainable and eco-friendly material with great potential to replace traditionally available construction materials like concrete and steel. However, accurately predicting the behavior of bamboo is essential for improving the structural design codes, which will enhance the wider usage of bamboo as a structural member. In this study, the buckling of bamboo is modelled numerically as both cylindrical and tapered circular columns with varying elastic moduli across the cross-sections in ABAQUS. Then, the results were compared with Euler's equation derived for the cylindrical and tapered circular columns having homogeneous cross-sections. Finally, it was observed that columns with varying elastic moduli across the cross-section have 1.5 to 2.3 times a lesser buckling load capacity than columns with homogeneous cross-sections with outer Young's modulus value (Eo). Also, compared to buckling load homogeneous cross-sections with inner Young's modulus value (Ei), varying elastic modulus cross-sections have 1.7 to 2.7 times higher buckling load. This study emphasizes the necessity of having a simple analytical equation with varying elastic modulus for calculating the buckling load for bamboo columns.