Aim: The aim of the research is to find out the hardness of the waste plastic bitumen by comparing the conventional bitumen and waste plastic modified bitumen using penetration test. Materials and Methods: The sample VG-30/40 penetration grade bitumen was tested for the present study. The experiment contains two sample groups, each of which requires 25 samples and 50 sample tests are performed utilising G-power 0.8 with alpha and beta qualities are 0.05, 0.2 with a confidence interval at 95%. The Penetration test is performed by the waste plastic modified bitumen whereas the number of samples (N=25) and conventional bitumen were the number of samples (N=25). Results: The waste plastic modified bitumen has 80 mm surface hardness of bitumen when compared to the conventional bitumen 68 mm. The study has a significance value of p<0.05 i.e. p=0.026. Conclusion: The waste plastic modified bitumen outperforms conventional bitumen in penetration tests for performing the surface hardness