Decreased kidney function will occur along with an increase in a persons age which usually starts from the age of 40 years and this phenomenon increases in Geriatrics. Indirect assessment of kidney function can be achieved by calculating the estimated Glomerular Filtration Rate (eGFR) utilizing the Cockroft-Gault (C-G), Modification of Diet in Renal Disease (MDRD), or Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equations. Method: This descriptive correlation research employed a cross-sectional design using retrospective data by tracing the medical record data of the patients at the Geriatric polyclinic Dr. Hasan Sadikin Hospital, Bandung, from January - June 2021. The analysis used was the Shapiro Wilk test and the Spearman correlation test which was processed using SPSS 25.0. Result: The number of subjects who met the inclusion criteria were 47 people. There is a strong correlation between the C-G and MDRD equations in comparison to the CKD-EPI equation, with r values of 0.992 and 0.876 (p < 0.001), respectively. Discussion: MDRD has greater accuracy and less precision than C-G against CKD-EPI equation. Overall, MDRD is better than C-G equation. Conclusion: A significant correlation exists between eGFR values based on the C-G and MDRD to CKD-EPI equation for patients at the Geriatric Internal Medicine Polyclinic, Dr. Hasan Sadikin Bandung Hospital.