Hepatic stiffness measured by magnetic resonance elastography (MRE) is a biomarker that correlates with histopathological staging of liver fibrosis. Conventional Cartesian gradient-echo MRE requires breath-holding (BH), which may be inconsistent and challenging for children. Free-breathing (FB) MRE based on radial acquisition is a promising solution to this problem. In this study, we investigated the agreement in hepatic stiffness values from BH-MRE and FB-MRE, as well as repeatability, in healthy children and pediatric patients at 3T. Bland-Altman analysis showed a high level of agreement between BH-MRE and FB-MRE, and repeatability analysis showed similar performance for BH-MRE and FB-MRE.