Aim: Conductance of graphene nanoribbons and carbon nanotubes are simulated by varying the bundle width from 100 nm to 2000 nm with the step size of 100 nm. Materials and Methods: Electrical conductance of Carbon nanotubes (n=100) was compared with graphene nanoribbons (n=100) by varying bundle width of both materials carbon nanotubes and graphene nanoribbons ranging from 100 nm to 2000 nm concerning the length ranging from 2 μm to 10 μm with the step size of 2 μm for each interval of the bundle width in the NANO HUB tool simulation environment. The pre-testing analysis was performed using clinicalc.com with G-power set to 85%, the threshold set to 0.05 for each group, and the sample size set to 100. Results: Graphene nanoribbons have significantly higher conductance (120.487 mho, P<0.001) than carbon nanotubes (31.364 mho, P<0.001). The optimal bundle width for the maximum conductivity is 2000 nm for Carbon nanotubes and graphene nanoribbons. Conclusion: Within the scope of this study, Graphene nanoribbons with a bundle width of 2000 nm offer the best conductivity.